: PEDICELLINA. 381 



bankia repens, Johns. Brit. Zooph. 256. Laguncula repens, Van Beneden Rech. 

 25, pi. l,and pi. 2, A. 



Hab. " Parasitic, with a creeping stem, on Sertularia and on Halo- 

 dactylus diaphanus. Not very common," Farre. In Strangford 

 lough, parasitical on sea weeds, W. Thompson. 



" This species has twelve ciliated arms, not spiny. The alimen- 

 tary canal is short and stout, and whilst the animal is expanded re- 

 mains high up in the body. During retraction the stomach is never 

 brought down to the bottom of the cell, but remains suspended from 

 the upper part of it by the intestine, which appears to have some 

 attachment at this point. The upper part of the tube, however, is 

 generally brought down lower than the stomach, in order that the 

 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 

 Bowerbankia. They are set at some distance apart." Farre. 



Van Beneden says that the tentacula vary from 10 to 12, and 

 that they are less regular than in other genera of the order, with an 

 indication of a binary disposition, as if they were tending to the 

 crescentic figure of those of the fresh-water Polyzoa. 



FAMILY PEDICELLINA. 

 POLYPIARIA PEDICELLINEA, P. Gervais in Ann. des Sc. Nat. vii (1837), 80. 



29. PEDICELLINA,* Sars. 

 CHARACTER. Polypes invested with a thin transparent poly- 



Formed from pes, -edis a foot. The definition given by Sars is as follows: 

 "Corpora gelatinosa nuda, pedicellata, clavata, hi surculo tereti repente verticalia. 



