OF MOLLUSCA. 45 



nations, one branchial on the left, and the other anal. Proboscis 

 elongate, cylindrical, annulated. Jaws two, horny. Tongue-mem- 

 brane short. Shell thin. Aperture large. Operculum none. 



* Shell short, externally spiral. 



1. Velutina. 



Shell spiral, cap-shaped, spirally grooved ; aperture roundish ; 

 lips simple. Mantle edge slightly swollen. Foot rather long and 

 wide, truncated in front ; gills of two plumes, one of numerous 

 striae, the other inferior, small. Verge compressed. 



1. V. laevigata, t. 103. f. 6, t. 109. f. 10 ; Forbes fyHanley, B. M. 

 t. O.O. f. 7, copied Adams, Gen. Moll. t. 21. f. 2. 



" Central tooth of Velutina haliotidea Fig. 25. 



strong, subquadrate, transverse ; cutting Velutina haliotidea. 



edge transverse, with one sharp point, 

 toothed on both sides ; first lateral 

 tooth subquadrate, toothed on the mar- 

 gin with a larger pointed tooth, second 

 and third similar, claw-like, simple." (fig. 25) — Lovkn. 



The foot of Velutina is lanceolate, moderate, double in front. 

 Tentacles short, compressed, rather distant at their base, with a 

 slight crest between them. Eyes on the outside of the tentacles 

 near the base. Penis on the right side, large like that of Buccinum, 

 with a subapical conical tip. Operculum none. 



" Velutina Icevigata inhabits deep water. The shell is covered with 

 a rough epidermis, and the striae constitute properly fine ridges, 

 which are crossed by others less distinct ; but when the epidermis 

 is removed, it becomes smooth or faintly striolate, and the shell is 

 then either pure white or pale rose colour. The animal is white, 

 and entirely fills the shell. Tentacula two, tapering, short. Eyes 

 on an enlarged space at the external base of the tentacula. Foot 

 oblong, short, with plain margins ; cloak plane, entire ; above the 

 outer tentaculum the male organ appears, in the shape of a short 

 thick obtuse process." — Johnston, Berw. N. Club, i. 275. 



2. MORVILLIA. 



Shell ovate, orbicular, compressed ; spire conical ; whorls three or 

 four ; upper small, last very large, covered with a calcareous incrus- 

 tation ? Aperture ovate, very large, nearly the whole length of the 

 shell ; outer lip sharp and spreading ; inner lip sharp-edged, mar- 

 gined with a flattened crescent-shaped opake white space. Operculum 

 none. Tentacles thick, rather depressed, near together at the base. 

 Eyes on the outer side near the base. Foot oblong. Mantle thick- 

 ened within in front. Penis large, compressed on the base of the 

 outer side of the right tentacle. 



1. M. zonata (Velutina z., Gould, Mass. f. 160). 



