382 VOLVATELLA. 



Cyl. sculpta G. & H. NEVILL, Journ. Asiat. Soc. Beng. xxxviiij. 

 p. 68, pi. 13, f. 3, 1869. 



This species is somewhat swollen toward the vertex and is marked' 

 above with rib-strise, like C. fischeri. 



C. PUSILLA Nevill. PI. 42, figs. 24, 25, 26. 



Shell elongate-cylindrical, somewhat swollen behind and trun- 

 cate ; white, shining, pellucid, very thin ; with a narrow suture be- 

 hind ; lip inflexed. Aperture transversely subdilated, with thin 

 margins ; surface marked with minute stride, closer behind. Alt. 4,. 

 diarn. 2 mill. (Nev.~). 



Ceylon. 



Cyl.pusilla G. & H. NEVILL, 1. c. p. 68, pi. 13, f. 2. 



Rather closely allied to C. beauii, but differing in the overlap- 

 ping of the outer lip, etc. There also appears to be considerable 

 resemblance to a shell described by H. Pease as Volvatella Candida, 

 (Nev.). 



Genus VOLVATELLA Pease, 1860. 



Volvatella PSE.. Proc. Zool. Soc. Lond. 1860, p. 20; Arner.. 

 Journ. Conch, iv, p. 73. 



Shell thin and fragile, elastic, swollen in the middle, slightly nar- 

 rower below, abruptly contracted above the vertex into a short tubular 

 open canal formed by the raised continuation of the inner and outer 

 lips. Spire sunken and conclealed in an apical rimation. Aperture 

 as long as the shell, roundly dilated and very effuse below, the whole 

 interior being visible from the base, very narrow in the middle, pro- 

 duced above the vertex in a spout-like channel. Columella thin,, 

 spirally ascending. Type V.fragihs. 



Animal completely retractile into the shell ; head disk subquad- 

 rate, truncate and emarginate in front, strongly bilobed behind ;: 

 eyes developed. Foot oblong, truncated in front, tapering behind.. 

 Epipodial lobes wanting ; mantle small, included in the shell. 

 Dentition unknown. 



Distribution : Indo-Pacific. Living on sea-weed. 



This group is apparently most closely allied to Cylindrobulla, 

 differing only in the swollen form of the shell and its posterior 

 "spout," which replaces the A ^era-like slit of the other genus. 



