Perkins.] 118 [October 6, 



Triforis Deshayes, 1825. 



Triforis nigroeineta Stimps., Check List. Ceritliium nigrocinc- 

 tum Gould, Invert. Mass., p. 277, fig. 182; De Kay, Moll. N. Y., 

 p. 129. 



Very rare. 



NATicnm 



Lunatia. Gray, 1847. 



Lunatia heros Stimps., Check List. Natica heros Say, Am. 

 Conch., p. 86, 1822; Gould, Invert. Mass., p. 233, fig. 165; De 

 Kay, Moll. N. Y., p. 120, pi. vii, figs. 148, 149. 



Laminarian, not common. 



Lunatia triseriata Stimps., Check List. Natica triseriata Say, 

 Am. Conch., p. 121, 1826; Gould, Invert. Mass., p. 233, fig. 165; De 

 Kay, Moll. N. Y., p. 121, pi. vii, fig. 144. 



Quite rare and small. The teeth are similar to those of Neverita, 

 hut the middle denticle of the median tooth is proportionally much 

 longer than the others. The second lateral tooth is broader than the 

 outer, and both are less curved than in Neveriia, and the inner lateral 

 tooth has fewer denticles. 



Neverita Eisso, 1826. 



Keverita duplicata Stimps., Check List. Natica duplicata Say, 

 Am. Conch., p. 85, 1822; Gould, Invert. Mass., p. 236, figs. 163, 

 164; De Kay, Moll. N. Y., p. 121, pi. vii., fig. 147. 



Laminarian. Most common near the shore in shallow water, where 

 it burrows in the sand. It occurs quite large, some specimens being 

 sixty-eight mill. (2.7 in.) high and sixty-seven mill. (2.6 in.) broad; 

 but the average size here is about half this. The animal is very 

 large, of a dirty white color; the head is covered by a fold from the 

 upper part of the foot; tentacles short, flat, triangular, usually edged 

 with black, unequal; eyes wanting; foot very large, perforate with 

 minute openings, from which, when disturbed, the animal throws 

 water; round, ruffled on the edge, much corrugated beneath; opercu- 

 lum semicordate, corneous, with distinct spiral lines of growth, which 

 are crossed at right angles by faint radiating curved lines; lingual 

 ribbon moderately long. Teeth 3-1-3; median tooth with three 

 rather short triangular denticles, the central a little the longest; in- 



