Volume 2

A monograph of the British fossil crustacea, belonging to the order merostomata / by Henry Woodward.

  • Henry Woodward
Date:
[between 1860 and 1869]
Catalogue details

Licence: Public Domain Mark

Credit: A monograph of the British fossil crustacea, belonging to the order merostomata / by Henry Woodward. Source: Wellcome Collection.

    29/62 page 65
    Head (1—7) = 2 inches long by 3 inches broad. Segment (8) = 4 lines ,, 3 yy 2 lines broad. » (9) = 8 „ 3 yy 3 yy 0 *0 2 0 » (10) = 9 „ 3 yy 4 yy » (11) = 9 „ 3 yy 2 yy » (121 = 9 „ 3 yy 2 yy .. (13) = 9 „ 3 yy 2 yy V » (14) = 8 „ 2 yy 6 yy < » (15) = 8 „ 2 yy 2 yy c3 » (16) — 0 2 yy 0 yy G 1 (17) = 9 ,. 1 yy 10 yy 0 » (18) = 10 „ 1 yy 6 yy < » (19) = 1 inch „ 1 yy 5 yy Telson (20) = 1 „ 9 lines „ 1 yy 5 yy The head is nearly one third broader than long, semicircular in front, the large com pound eyes forming prominent projections on the latero-anterior border about 10 lines in length. The facetted cornese of the eyes in PI. XIII, and of the detached head figured on PI. XIV, 1 1 c, can be distinctly seen with a good pocket-glass. The larval eye-spots, or ocelli, are also clearly seen in the centre of the carapace of all the specimens figured. The surface of the carapace is destitute of squamate markings or any other kind of ornamentation whatsoever; but the surfaces of the coxal joints of the ectognath (PI. XIV, fig. 1 c) and the cordiform metastoma, or post-oral plate, are both highly orna- mented with squamate markings (PI. XV, fig. 3). The chelate antennce belonging to the specimen figured in PI. XIII are 4| inches in length, and the chelae are 5 lines broad. The length of the movable ramus of the chela is 1 inch; the inner border of both rami are closely planted with large and small sharply pointed teeth. They closely resemble in form the antennae of var. a already noticed. The endognaths agree in form with the previously described organs of var. a. The woodcut figure of a detached endognath given at page 59 (fig. 11) probably belongs to this variety, with which its size well agrees. The metastoma or post-oral plate (PI. XIII, figs. 1 a, m, and 1 c; PI. XIV, fig. 2 and PI. XV, fig. 3) is oblong oval, deeply bilobed in front, and slightly truncated along its posterior border. It is closely covered, especially upon its anterior and bilobed portion, with minute squamate markings. The detached lip-plate (fig. 3, PI. XV) is 2 inches 4 lines long and I5 inch in breadth near the centre, representing an individual not less than 18 inches long. Although the thoracic plate or operculum is discernible in the specimen figured in 1 This lip-plate belongs to the specimen figured in PI. XIII, which was thus figured twice by mistake.
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