A history of the British zoophytes / by George Johnston.

Date:
1838
Catalogue details

Licence: Public Domain Mark

Credit: A history of the British zoophytes / by George Johnston. Source: Wellcome Collection.

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

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    “ It consists of a creeping tube and a number of stems branching from it, each ending in an animal that is shown (not very distinct- ly) at fig. 42, d. The stems, though commonly still, have free power of motion ; and when one is disturbed it bends quickly to and fro, so as to strike one or two more; these again strike upon others, and thus for a few seconds all are in action : but they soon return to quietness, and the arms, which during the commotion had been doubled in, open again. (Fig. 42, c.) “ The arms are placed on the edge of a pretty transparent tunic, and have granulations on their back. They are fringed with cilia; possessing the same action as those of Ascidiae and Flustrae; and in the specimen drawn, small substances were occasionally seen car- ried downwards along them. As in Flustra, a part of the intestine had within it a revolution of particles and dark matter round its axis, and this part communicated with an ascending rectum. The arms at the part of the circle opposite to the rectum appeared to be con- description of what appears to be the same species in the Cyclop, ol Anat. and Physiology, i. 610, fig. 293; for a mere difference in the ramification can scarce- ly be considered specifical in this tribe. 3