CUSPIDELLA HUMILIS. 209 



Genus CUSPIDELLA, Hincks. 



Der. Diniin. formed from ctispis, a point. 



GENERIC CHARACTER. Stem creeping, filiform ; hydro- 

 theca cylindrical or subcylindrical, perfectly sessile, with a 

 conical operculum composed of many pieces; polypites 

 cylindrical, with a conical proboscis. 



Reproduction unknown. 



IN this genus there is no trace of a pedicel or erect stem ; 

 the calycles are not constricted towards the base, but are 

 open cylinders to the point of junction with the creeping 

 fibre. 



When it was first constituted, only a single species was 

 known ; but I have since met with two more, in which the 

 typical characters are well represented. All the species 

 are exceedingly minute. 



1. C. HUMILIS, Hincks. 



CAMPANULARIA HUMILIS, Hincks, MS. ; Aider, Suppl. North. & Durh. Cat, in 



Trans. Tynes. F. C. v. 230. 



CALYCELLA? HUMILIS, All man, Ann. N. H. for May 1864. 

 CusriDELLA HUMILIS, Hincks, Ann. N. H. for October 1866. 



Plate XXXIX. fig. 4. 



STEM very delicate; HYDROTHEC^E subcylindrical, rather 

 stout and short, the upper portion divided into 10 or 12 

 convergent segments, which form an operculum; GONO- 

 THEC.E unknown. 



THE calycles of this curious and very minute species are 

 like little cylinders rising directly from the creeping stem ; 

 occasionally they expand slightly upwards. The oper- 

 culum is sometimes drawn within the calycle, as in the 

 case of Calycella syringa. 



