54 STUDIES IN GEOLOGY, No. 3 



but is probably a new species. Fragments of the shell which 

 remain are similar to that of D. camura Guppy. 

 Variegated Zorritos. South of Quebrada Pantheon.. 



Genus PYRULA Lamarck 



Pyrula peruviana n. sp. 



PLATE II Figs. 5, 6. 



Shell of moderate size, delicate, gracefully rounded. Spire 

 low, the early whorls standing up above the later ones. 

 Whorls about five in number, the 2^ earliest being smooth, 

 and the following ones delicately sculptured with spiral and 

 longitudinal threads. The spiral threads are of two orders 

 of strength; the major spirals are strong, and between them 

 the surface is slightly concave, ornamented by seven evenly 

 spaced minor threads, of which the median one is somewhat 

 stronger than the others. Longitudinal threads, of an order 

 of strength midway between the extremes of the spirals, 

 cross the spiral threads, appearing under the microscope to 

 have been laid across them. The longitudinal threads are not 

 evenly spaced ; they are from .5 to I mm. apart on the median 

 surface of the body whorl. The body whorl has the shape 

 characteristic of the genus. Height of figured fragment, 36 

 mm. ; diameter, 21 mm. 



This species is very close to several Miocene species from 

 the Florida^-Caribbean region. It differs but slightly from 

 P. eopapyracea Gardner (Ms) from, the Chipola marl of 

 Florida, having additional minor spiral threads, seven instead 

 of three between the major spirals, as in eopapyracea. Pyrula 

 micronematica Brown and Pilsbry, 47 from Gatun, is identical 

 in type of sculpture, differing in having the longitudinal 

 threads more widely spaced, and in being somewhat larger. 

 Pyrula carbasea Guppy, 48 from the Caroni series of Trinidad, 



47 Proc. Ac. Nat. Sc. Phila., vol. 64, p. 507, pi. 22, fig. 8, 1912. 

 48 Quart. Jour. Geol. Soc. Lond,, vol. 22, p. 580, pi. 26, fig. 7, 



1866. (as Ficula carbasea} 



