﻿AMERICAN TERTIARY AND CRETACEOUS FOSSILS. 385 



a rounded carina; under surface much more distinctly striate than the upper; on the 

 edge of the umbilicus, and on the middle of the inner side of the whorl in the umbili- 

 cus, there is a row of tubercles, and between the two rows are small revolving'lines. 



Dimensions. — Height '2 in., diameter of disc "55 in. 



Locality. — Caldwell Co., Texas. My collection. 



"^A. Meekana. PI. 67, fig. 40. Discoid, whorls five, strongly carinate on the edge 

 and somewhat rounded below ; mouth subrhomboidal ; umbilicus wide ; surface above 

 marked on the edge and on the middle of the whorl by two large, revolving nodose 

 lines, and on the rest of the top by five smaller ones ; between the two large ones there 

 are numerous cross lines passing from one to the other ; below,besides the " keel"' on the 

 edge of the whorl, there are seven ribs, one large one bordering the umbilicus and six 

 smaller alternating ribs; in the umbilicus there is one rib on the middle of the whorl, 

 besides the one on the edge. 



Dimensions. — Height "1 in., diameter of disc '32 in. width of umbilicus *15 in. 



This beautiful species, under a glass, looks as if covered with " beading," all the ribs 

 having that peculiar structure. Four specimens from Caldwell Co., in my collection. 

 One' very fine one from Wheelock, in the collection of the Smithsonian Institution. 



SPIRORBIS, Swains. 



S. leptostoma. PI. 67, fig. 41. Discoid ; whorls three, carinated and partly en- 

 veloping the preceding whorl ; mouth contracted, circular and advanced at a tangent 

 from the subjacent whorl; surface marked by irregular undulating transverse strias. 



Dimensions. — Diameter *3 in. 



Locality. — Common from Wheelock, and found in Caldwell Co. 



TURRITELLA, Lam. 



^ T. nasuta. PI. 67, fig. 42. Shell elongated, slender; whorls many (number? 

 eleven in one inch) ; mouth small, suture distinct ; surface marked by eight revolving 

 lines, two or three of which are larger than the rest. 



Dimensions of a specimen one inch long. — Width of body whorl '2 in., length of 

 mouth "15 in. 



All the specimens I have seen are broken and nearly all worn smooth. It is com- 

 mon. 



Locality. — Caldwell Co., Texas, and Wheelock. 



EULIMA, Bisso. 



f E. exilis. PI. 67, fig. 43. Elongated, slender, polished; whorls eight; apex 



acuminate, mouth small, outer lip nearly straight. 



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