Head with large conical tentacles, widely diverging, bear- 

 ing the eyes on an expansion of their postero external 

 margin; snout rather long, apparently not introvertible. 

 Between the muscular foot and the snout a soft prominence 

 is present probably marking the opening of a pedal gland. 

 Foot large, oblong, double edged in front. Anterior siphon 

 well developed. In the character of the gill, the osphradium, 

 and mucous gland, as well as in the position of the anal, 

 genital, and renal orifices, this form is indistinguishable from 

 Volnta. 



The oesophagus, stomach, and intestine form a simple 

 U-shaped bend, and resemble those of Voluta and other 

 prosobranchs. An enormous appendix to the oesophagus 

 entirely fills up the anterior body cavity. No peculiarities 

 are presented by the heart or genital organs. 



The nervous system at first sight seems to resemble that 

 of Valuta and Cancellaria, the sub-intestinal ganglia curving 

 round under the oesophagus, and connecting the left with the 

 right pleural. It however differs from these two genera in the 

 relation of the supra-intestinal ganglia, and in this respect 

 more nearly approaches the Buccinidae. 



Radula. — A single series of tricuspid teeth, no laterals. 



NEPTUNEOPSIS GILCHRISTI, sp.nov. 



Shell elongately ovate, of light substance, rather thin, 

 semi-transparent; of a light pinkish buff-colour throughout, 

 covered with a very thin, line texture olive-brown epidermis; 

 spire rather long, nucleus large, rounded at the base, and 

 rising to a l)lunt point at the summit, slightly tortuous, 

 having much the form of a tulip bulb; whorls (exclusive of 

 the nucleus) 6, moderately and regularly convex, smooth, 

 longitudinally verv tinely striated, the striae being rendered 

 somewhat irregular by coarser growth lines; spirally finely 

 wrinkle-striated ; suture impressed ; last whorl ovate, about 

 equal in length to the spire, attenuated and slightly produced 

 at the base, but not rostrate; aperture slightly expanded; 

 columella rather straight, without folds or plaits, covered 

 with a thin effused enamel of the same colour as the rest of 

 the shell; outer lips slightly reflexed at the margin. 



Operculum oblong, horny, dark brown with nucleus at 

 the extremity; exterior marked with faint concentric 

 laminae ; and with a longitudinal depression in the middle ; 

 interior roughly corrugated, with a shining cartilaginous 

 border. Radula very small, with a single series of oblong, 



