History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard.

  • Pritchard, Andrew, 1804-1882.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    874/1074 (page 854)
    pseudo-nodules ; granules minute, radi- ating from an angular umbilicus ; spines few, man rinal. BriMJ.iv.p.276,pl. 17. f. 17. Maryland deposit. There is at eacli angle a short spine, and sometimes another at the middle of each margin. Professor Bailey regards this species as identical with T. Amblyoceros; hut we cannot believe that Ehrenherg would have omitted so remai-kable a character as the angular umbilicus, nor are both species found in the same deposit. We have akeady given our reasons for doubt- ing the correctness of the supposition that Ehrenberg foimded his Sijmholo- phora Trinitatis upon this species. T. annulatum (Wallich).—Valve mi- nute, with slightly produced rounded angles and concave sides; sm-face marked with concenti-ic rings, and a ray proceed- ing from the centre towards each angle. Ganges. WaUich, MJ. vi. p. 249, pi. 12. f. 15. Valves covered with minute puncta, aggi-egated into concentric rings. 2* Lateral surfaces with radiating vein-like lines. t T. radiatum (Bri.). — Sides straight; angles obtuse; radiating lines most evi- dent at centre and margin; granules nunute, radiating. Br. I. c. p. 275, pi. 17. f. 14. Bai-badoes deposit. Frustules large, without horn-like processes. T. margi7iatum (Br.).—Valves with a triangular centre, which is surrounded by a broad border divided into compart- ments by short transverse lines. Br MJ. iv. p. 275, pi. 17. f 13. Fossil. Sides straight, angles with double pseudo- nodrdes; gi-anrdes of centre minute, radiating, those of compartments larger and scattered. T. venosum (Br.). — Sides concave ; angles rounded, sm-face dotted, and marked by three radiating pinnated lines or veins, (vi. 17.) Br MJ. v. p. 274, pi. 17. f. 5. Barbadoes deposit. A very beautiful and distinct species. T. tabellarium (Br.).—Margin indented in foliaceous curvatures; granules nrmie- rous near the margin, elsewhere in patches; angles with small horns. Br MJ. iv. p. 275, pi. 17. f. 15. Honduras. This species is well distinguished by its scolloped margin. It is doubtful whe- ther it is properly placed in this section. T. variabile (Br.). — Surface with a transverse line below each angle, and some in-egular radiatmg veins; granules scattered, indistinct at the angles. Br MJ. iv. p. 275, pi. 17. f. 19. Peruvian guano. Resembles T. alternans, but is larger and generally distorted; the angles are conicid. Mr. BrightweU figm-es a quadi'angular form of this species. T. truncatum (Br.).—Angles elongated into broadly truncate arms, centre di- vided into gi-anulated compartments by radiating vein-like lines. Br MJ. iv. p. 274, pi. 17. f. 4. Barbadoes earth. Frustules triradiate. 3* Lateral surfaces with transverse lines separating the angles from the hexagonal centre. T. hrachiatum (Br.).—Triradiate; an- gles elongated into truncate arms, and separated from centre by transverse lines. Br MJ. iv. p. 274, pi. 17. f. 3. Barbadoes earth. Distinguished by its angles pro- longed into rays. It resembles T. trun- catum in form, but is smaller, and has no radiating veins. T. alternans (Bai.). — Sides straight, angles obtuse, granulated like the hexa- gonal centi-e. SBD. i. p. 26, pi. 5. f 45. Common, recent and fossU. England, United States guano, (vi. 21.) Front view quadi'ate, not constricted; the angles not prolonged into processes. T. trimlcum (Bai. MS.). — Sides veiy concave; angles broadly roimded, sepa- rated fi-om centre by transverse lines; granules crowded and veiy minute at angles, elsewhere few, large, and scat- tered. (^^II. 27.) From a di-awing by Professor Bailey. Gulf-stream shells, W. Indies. This species may be known by its distant granules. T. castellatum (West).—Sides of the frustule deeply concave ; angles foi-ming segments of circles. Valves with con- cave sides and roimded angles, foi-ming dome-shaped eminences; sm-face punc- tate, with a single row of larger P^ucta along the opposed margins. West, TMb. viii. p. 148, pi. 7. f. 3. Barbadoes deposit. (vm. 29.) ,^ , T. Jb/»woMj(Ralfs,a.s.).—Valves with rounded angles and concave sides, sur- face with scattered granules, and a large granulated space at the angles, separated by a ti-ansverse smooth baud; mai-^m with a few short Imes. Barbadoes de- posit. Johnson. Valves lai^e, -svith conspicuous granules, which are few at the centi-e, and more numerous near the margin; each side with a few short stnaa like those figm-ed by Mr. Brightwe 1 m T. tabellarium, but the maxgm itsell is not undulated. ^ ^ - T. umbilicntum (Halfs, n.s.).—Valves