MIOCENE MOLLUSC A AND CRUSTACEA. 121 



Somewhat resembles L. heros Say, but has a more vertical axis, with 

 rounder, more exsert inner volutions, giving a proportionally higher spire. 

 The specimens figured as Natica heros Say, by Tuomey and Holmes, Pliocene 

 Foss. South Carolina, PL xxx, fig. 15, I consider as also pertaining to 

 this species, although being very much larger than the New Jersey exam- 

 ples from which this description is taken. 



Formation and locality: In the gray micaceous marls of the Miocene at 

 Jericho, N. J. In the collections of the National Museum. 



Genus NEVEEITA Risso. 



Neverita duplicata. 



PI. xxi, figs. 13-16. 



Natica duplicata Say: Jour. Acad. ^"at. Sci., Phila., vol. 2, 1st ser., p. 247; Tuomey 

 and Holmes, Plioc. Foss. S. C, p. 114, PI. xxv, fig. 16; Emmons, Geol. K C, 

 1852, p. 266, fig. 150. 



Neverita duplicata Conrad: Proc. Acad. Mat. Sci., Phila., 1862, p. 564; Meek, Check 

 List Miocene Foss,, p. 19. 



"Shell thick, subglobose, cinereous, with a black line revolving on the 

 spire above the suture, and becoming gradually diluted, dilated, and obsolete 

 in its course; within brownish livid; a large incrassated callus of the same 

 color extends beyond the columella, and nearly covers the umbilicus from 

 above; umbilicus with a profound sulcus or duplication." (Say.) 



There are a number of small individuals in the collections made within 

 the State that are unmistakably of this species, although none of them exceed 

 five-eighths of an inch in diameter, and all are more or less imperfect from 

 breakage or the removal of the surface. They are quite readily recognizable 

 as identical with the form now common on the Atlantic coast, and can not be 

 said to differ in any respect. One feature of many of them, common, how- 

 ever, to other associated species, is, that from weathering and decay the 

 callous portion bordering the suture breaks away, leaving the spire more 

 exsert than in the entire form, and alse presenting a flattened rim on top of 

 each volution bordering the suture, thus giving them the same structure 

 along the suture so commonly seen on the Cretaceous genus Gyrodes. It 

 is plainly seen, however, to be only the effect of decay in these shells, as it 



