190^ 



NATURAL SCIENCES OF PHILADELPHIA. 



767 



numerous and in a spiral direction. Whorls 5, slightly convex, regu- 

 larly widening to the last, which is fully double the width of the pre- 

 ceding, rounded peripherally. Aperture oblique, rounded-lunate. 

 Alt. 13.5, diam. 22.3 mm.; width of umbilicus 2 mm. 



Guatemala: Huehuetenango. Type No. 85,521, A. N. S. P., col- 

 lected by Mr. Gustav Eisen, and communicated to me by Mr. Fred L. 

 Button. 



This is a superb OmpJialina, perhaps the finest of the genus in color 

 and sculpture. In proportions it is near 0. lucuhrata Say, from which 

 it differs in coloration and sculpture, the radial grooves of the upper 

 surface being like those of Vitrea indentata on a large scale. 



With the red bands of 0. hilineata, it is a much larger shell, quite 

 different in sculpture. 



Teetli of Omphalina martensiana. 



The jaw is like other species of the genus. The radula has 

 62.7.1.7.62 teeth, the seventh on each side being transitional. The 

 teeth at the middle of the marginal series (fig. 31) have unusually long 

 and graceful cusps. Omphalina bilincata has fewer lateral teeth, only 

 5, the last being a transition tooth. 



The name is to honor the author of the splendid volume on moUusks 

 in the Biologia Centrali Americana. 



Omphalina bilineata (Pfr.). 



Near Jalapa, V. C. Of 5 specimens, four have narrow bands at 

 periphery and suture, the other one being bandless. 



Omphalina lucubrata (Say). 



Texolo, ^^ C, A fine series, taken by Mr. Rhoads in 1899. 



Omphalina montereyensis Pils. PI. XLVIII, figs. 6, 6a, 66. 

 Proc. Acad. Xat. Sci. Pliila., 1899, p. 395. 



Diente, a village near Monterey, Nuevo Leon (S. N. Rhoads, 1899 

 and 1903). A large series shows this to be very constant in shape and 

 in the comparative size of the umbilicus, the width of which is contained 



