396 On Campylonema, a new Genus of Polyzoa. 



LV. — On Campylonema, a new Oenus of Polyzoa. By the 

 Rev. Thomas Hincks, B.A., F.R.S. 



[Plate XX, fig. 5.] 



On stones and stems of seaweed collected from the Capstone 

 at Ilfracombe a minute Polyzoon has occurred to me not un- 

 commonly, which, though closely resembling the well-known 

 Valkeria in general appearance, presents an arrangement of 

 the tentacles so remarkable that it can only be referred to a 

 new genus. I suspect that it may prove identical with the 

 form which I have already characterized under the name of 

 Valkeria tremula'^. At least there is a striking agreement 

 between the two in the shape and size of the zooecia, and the 

 manner in which the colonies are distributed on the creeping 

 stolon ; and as I was unable to make a thorough examination 

 of the polypide of Valkeria tremula, the peculiarity in the ten- 

 tacles, supposing it to exist, might readily have escaped me. 

 This point, however, must be left for future determination. 



Qlsi&B POLYZOA. 



Order INFUNDIBULATA. 



Suborder CTENOSTOMATA, Busk. 



Family Vesiculariidae. 



Genus Campylonema, Hincks. 



Der. Kd[nrv\os, bent, and i^/^a, a thread (tentacle). 



Generic character. — Polyzoary a filiform creeping stolon, on 

 which the zooecia are distributed at intervals in groups ; 

 zooecia erect, sessile ; polypides with eight tentacles, two of 

 which are bent outwards for about two thirds of their length, 

 so as to interrupt the circle of arms on one side; no gizzard. 



Campylonema tremulum, n. sp. 



Zooecia very small and slender, oblong, tapering off to a 

 point below. 



The remarkable arrangement of the tentacles is the one 

 point of difference between this form and Valkeria. The 

 abrupt reversion of two of the arms destroys the circular form 

 of the tentacular verticil, and gives it somewhat the shape of a 

 horseshoe. Six of the arms stand erect as usual ; the other 

 two are thrown back, so that on one side the circle is broken. 

 The flexure of the tentacles takes place at about a third of the 

 whole height from the base; this peculiarity gives averyremark- 



* " Catalogue of the Zoophytes of South Devon and South Cornwall," 

 p. 68, pi. xii. fig. 9 (Ann. Nat. Hist. 1862, ser. 3, vol. ix. p. 472). 



