BowEKBANKU. Z. ASCIDIOIDA. 257 



tentacles may be completely drawn in. By this suspension of the 

 stomach from the upj)er })art of the cell a fixed joint is obtained, from 

 which the retracted Hexed 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 luay 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 suflBciently 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, h.) 



" 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 thj genus or of its species has been published. 



f The Hydra coronata of Fleming, Biit. Anim. 554. Ellis's specimens were 



parasitical on Plumularia falcata Professor Sharpey has given a figure and 



R 



