Bowerbankia. 
Z. ASCIDIOIDA. 
• 257 
tentacles may be completely drawn in. By this suspension of the 
stomach from the upper part of the cell a fixed joint is obtained, from 
which the retracted flexed portion of the tube may erect itself with 
the same effect as if the stomach were in contact with the bottom of 
the cell. This is a point which it would be important to observe in 
generic distinctions ; but here, as with many other points in this spe- 
cies, my observations were not carried to the extent that they have 
been in others, as this was one of the specimens with which my in- 
vestigations were commenced, and I have never since had an oppor- 
tunity of confirming them.” 
“ The cells have an oblong form, and are connected to their 
narrow creeping stem by a short peduncle. The opercular portion 
terminates in a notched margin, and is very short. (It is possible 
that this notched margin may be formed by the extremities of short 
and broad setae, but this was not determined.) The cells spring from 
the sides and upper surface of the stem, and turn upwards as in Bow- 
erbankia. They are set at some distance apart.” Farre . 
Dr Farre considers this species as forming a distinct genus, but I 
have not been able to seize upon characters, in his description, of va- 
lue sufficiently high to justify its separation. 
In the Philosophical Transactions for 1834, p. 385, pi. 12, fig. 5, 
Mr Lister has figured a zoophyte which he refers to the genus Tibi- 
ana of Lamouroux, but erroneously in the opinion of Milne-Ed- 
wards.* It seemingly belongs rather to this than to any other fa- 
mily of its order, but the polypes, instead of being contained in dis- 
tinct deciduous cells, issue from one continuous with the common 
stalk. This is represented as slender, alternately branched, the bran- 
ches simple, erect, forming a long tubular cell. The polypes appear 
to have eight tentacula. It was found at Brighton. (See wood-cut 
No. 42, a , b .) 
“ A zoophyte allied to the above was found upon the same marine 
plants, which seems to be that imperfectly represented by Ellis, pi. 
xxxviii. 5. F.’ f 
* Ann. des Sc. Nat. Part. Zool. vi. second, ser- p. 18. He refers it to his 
genus Lucia, slightly indicated in the 2de edit, of Lam. Anim. s. Vert. ii. 72, 
and says it should stand near to Crisia. Ibid. p. 185. I am not aware that any 
more detailed account of the genus or of its species has been published. 
f The Hydra coronata of Fleming, Brit. Anim. 554. Ellis’s specimens were 
parasitical on Plumularia falcata Professor Sharpey has given a figure and 
It 
