150 PALEONTOLOGY OF NEW JERSEY. 



EULIMID^. 



Genus LEIOSTRAOA H. and A. Adama. 

 Leiosteaca ceetacea. 

 Plate XIX, Figs. 3-5. 

 EuLima cretacea Conrad: Am. Jour. Conch., vol. 5, p. 100, PI. ix, Fig. 15. 



Shell small, slender, subulate, spire very much elevated, smooth and 

 polished; volutions nine or more (eleven, Conrad), flattened between the 

 sutures, the upper edge of any volution slightly smaller than the lower edge 

 of the one immediately above it, making the sutures remarkably distinct 

 for a shell of this group; body volution rounded subangular in the lower 

 part -and rather rapidly contracted below to the short columella ; aperture 

 ovate-elliptical, acute above and rounded below; outer lip thin and sharp, 

 inner lip smooth, without callus or ridges; surface polished, entirely desti- 

 tute of lines or other markings. On one individual, on which the lip is broken 

 away for one-third of the volution, there occurs a distinct spiral ridge above 

 the columella proper and just below the junction of the outer lip with the 

 body of the volution, within the aperture. 



This small but beautiful shell presents the general appearance of the 

 genus Eiilima Risso., except that the spire is straight, and there are no evi- 

 dences of the periodic mouths common to that genus. In the form of the 

 aperture it more closely resembles Leiostraca, but the volutions are more 

 decidedly flattened externally between the sutures. It seems to be more 

 nearly related to this latter genus than to any other established one. But 

 if the ridge found within the aperture of one of the individuals should 

 prove to be a constant feature, it would deserve a separate generic name. 

 This ridge, occurring as it does just below the top of the aperture on the 

 inner side, is peculiar, and may possibly be an accidental feature of the 

 individual; but I can not verify it without destroying the borrowed speci- 

 men. Mr. Conrad remarks under his description of the species that it is 

 "distinguished by the whorls of the spire suddenly curving inward above 

 the suture." This feature arises from the fact that the coiling .of the volu- 

 tion is just below the swell of the one above, but is seen distinctly only on 



