42 



Cyclope (Nassa) neritinea. 



Nucleus prominent above the surface of the apex of the semi-adult 

 shell, turrited, spirai, dextral, of three or four transversely sulcated 

 flat whorls, with a blunt tip, at length deciduous, leaving a flat, spirai, 

 rather callous scar. The vvhorls of the shell of the hatched auimal 

 suddenly enlarged, thick ; sniooth,spotted, formiug a suddea contrast 

 to the whorls of the nucleus. 



Risso formed a genus, name Nanina, from the young statė of the 

 shell. 



Fam. BucciNiD^. 



CUMA SULCATA. 



Operculum horny, ovate, triangular, with a deep notch on che 

 middle of the broad side, with a broad callous margin on the inner 

 angular edge of the inner surface. Body and foot with a deep groove 

 on the inner side, formed by the fold on the inner lip of the shell, 

 likę the notch in the opercuhmi ; foot folded up behind and together 

 in front, forming a ^-shaped groove, with a cross groove in front ; 

 tentacles close together at the base, divergiug, short, compressed,. 

 sharp-edged, eyes on the outer side near the tips, which are more 

 slender and acute above them ; proboscis moderately elongate, cylindri- 

 cal, subclavate, completely retractile ; lingual membrane very narrow 

 and elongate, horny ; teeth dark-coloured when adult, in three longi- 

 tudinal series, 1 • 1 • 1 ; the centrai teeth broad, transvcrse, about 

 half the width of the lingual membrane, with seven distant couical 

 denticulations on the front edge, the centrai denticle forming a con- 

 tinued centrai ridge, the lateral denticulations uuequal, the centrai 

 of the three larger, the outer one on the outer margin of the tooth ; 

 the lateral teeth small, couical, curved, acute, versatile vrith a simple 

 rather elongate base. 



B. Odontoglossa. 

 Fam. Fasciolariad^u 



Fasciolaria šalmo. 



Operculum ovate, acute, smooth, slightly concentrically wrinkled ; 

 apex of this individual reproduced and rather rounded. Animal bright 

 red ; foot, when contracted, folded together transversely behind and 

 longitudmally in front ; tentacles small, compressed, subulate, united 

 together at the base, forming a small veil ; eyes on the outer side, 

 rather above the base, with a conical tentacle only slightly produced 

 above the eyes ; proboscis very long, slender, entirely retractile ; lingual 

 membrane very long, slender, with three longitudinal series of teeth in 

 cross lines, 1 • 1 • 1, the centrai teeth narrow, square, with three small, 

 subequal, acute denticulations, the centrai one rather the longest ; 

 the lateral teeth very broad, shghtly arched, and more arched at the 

 outer end, with a series of twenty-five or thirty equal, regular, 

 elongate, subulate teeth, somewhat likę the teeth of a coarse hair- 

 comb ; the centrai teeth are opposite the space between the lateral 



