Cocculina.l GASTROPODA. 175 



anterior slope long, arched. Inside white, shining, the posterior horse- 

 shoe-shaped muscle-scar distinct. 



Length, 3 mm. ; breadth, 2 - 2 mm. ; height, 1-5 mm. (type). 

 Length, 3-25 mm. ; breadth, 2-25 mm. ; height, 1-6 mm. (C. meri- 

 dionalis, Hedley). 



Animal unknown. 



Type in the cabinet of Mr. YV. L. May, Sandford, Tasmania ; co- 

 type in my collection. 



Hob. About 15 miles off Great Barrier Island, in 110 fathoms ; 

 Port Pegasus, Stewart Island, in 18 fathoms (Captain Bollons) ; Auck- 

 land Islands, in 85 fathoms (E. R. Waite). Australia and Tasmania. 

 The type was dredged by Mr. W. L. May in 10 fathoms, Frederick 

 Henry Bay, Tasmania. 



Fam. HYDROCENIDJE, Fischer. 



The animal having no gill, but a pulmonary cavity. Tentacles 

 short, large ; eyes prominent, situate at the upper or outer base of 

 the tentacles. Foot short, oval, obtuse. The teeth of radula have the 

 formula ool. (1 + 1 + 1). 1; the central teeth are small, elongated ; 

 the lateral tooth is rather large, straight, without a cusp ; the nume- 

 rous lateral teeth are denticulate, and arranged in very oblique series. 



Shell imperforate, conic and globular ; whorls convex ; spire short ; 

 peristome continuous ; columella callous ; lip not reflexed ; oper- 

 culum calcareous, ornamented with stria? which are concentric to the 

 nucleus ; inner side with a prominent apophysis arising from the 

 nucleus. 



Genus 1. HYDROCENA, Pfeift'er, 1847. 



Hydrocena. Pfr., Zeitschr. f. Malak., 1847, 112. Type : H. cattaroensis, Pfr. 



Animal having the tentacles triangular, with large eyes at their 

 upper base ; operculum attached to the posterior part of the foot. 



Shell imperforate, small, amber-colour ; whorls few, convex ; aper- 

 ture oval, angled above, margins united by a thin callosity extending 

 across the body-wall ; peristome not reflected, not thickened ; colu- 

 mella slightly concave ; umbilical tract closed by a callosity ; Oper- 

 culum subconcentric, with a nucleus showing sometimes an apparent 

 spiral structure on its outer face. 



The type lives in the marine littoral zone, near Cattaro, Dalmatia. 



1. Hydrocena Purchasi, Pfeiffer, 1862. Plate 34, fig. 17. 



Hi/drocena Purchasi, Pfr.. Malak. Blatter, viii, 1862, 150; Hedley and Suter. 

 P.L.S. N.S.W. (2), vii. 623; Suter. J. de Conch., xli, 227.' Assimine'i 

 Purchasi, Pfr. : Hutton, M.N.Z.M., 40. 



Shell minute, globosely conical, translucid, imperforate. Sculp- 

 ture consisting of very fine growth-stria; only. Colour horny-fuscous. 

 Epidermis thin, shining. Spire conical, rather obtuse. Protoconch 

 minute, strongly convex, smooth. Whorls 4 to 5, convex, the last 



