TIMA BAIRDII. 37 
tissue are present in the substance of the peduncle, and give it its power of motion, so as to 
cause it at times to remind us of the proboscis of some pachyderm. With the exception of a 
tinge of green on the ovaries, and of pink on the tentacles, this animal is colourless. The 
specimens taken measure, body and trunk, from one inch to one inch and a half. 
Two specimens were taken by Mr. M‘Andrew and myself in the Reach of Dartmouth, 
August 31st, 1846. We afterwards took some at a distance of fifteen miles from land, off the 
coast of Devon and in the west bay of Portland. The peculiar distinctive characters of the 
tentacula distinguish this beautiful Geryonta from any recorded species. 
I have adopted the genus Geryonia in the limited sense accorded to it by Lesson, 
restricting it to those pedunculated forms of the group as first named by Peron and Lesueur, in 
which we find four phylliform ovaries. It thus constitutes a natural and probably extensive 
assemblage of species. Of the Geryonie, as restricted by Eschscholtz, four out of his six 
species, viz. G. tetraphylla, G. bicolor, G. rosacea, and G. exigua, will fall under the section 
so defined. Lamarck had united them with very different animals, such as Oceania and 
Pelagia, in his very unnatural assemblage, Dianza. De Blainville places it as a section of 
his extended genus Geryonia, distinguished from his Dianea by the presence of phylliform 
ovaries. The few species recorded of this genus are widely distributed: three are from the 
seas of the tropics, both Indian and Pacific ; one is from Gibraltar ; and one from the Adriatic 
(G. planata), briefly but excellently described and figured by Dr. Will. I have found a 
species in the Aigean. 
Geryonia appendiculata, as represented in Plate V, f. 2, is the animal seen in profile 
during the act of descending and contraction, (2, a, indicates the natural size,) and 2, ¢, is the 
same when ascending and expanding; 2, b, represents the position of parts as seen from 
above; 2, d, is an ovary magnified; 2, e, represents the two sorts of tentacles contracted, 
with the vesicles at their bases; these are represented still more highly magnified at 2, /, 
and 2, z. The proboscis, with the stomach and its lips, and the commencement of the gastric 
vessels, is shown in 2, h. 
Genus X. Tima, Eschscholtz (1839). 
Umbrella hemispheric; margin with (rather distant) tentacula; radiating 
vessels four, simple ; ovaries four, linear in the course of the vessels ; peduncle 
cylindrical, terminating in a campanulate stomach with four fimbriated lips. 
Tima Bairdii (sp.), Johnston (1833). 
Synonym. Dianea Bairdii. Johnston, in Loudon’s Magazine of Natural History, 
vol. vi, p. 320, fig. 41 (1833). 
One of the most earnest and enthusiastic of British naturalists, the author of the excellent 
‘History of British Zoophytes,’ discovered the elegant Medusa now to be described, and 
dedicated it to his friend Dr. Baird, a gentleman whose skill in some of the minutest and 
least investigated departments of zoology has gained him a high reputation, and who, devoting 
