STROBILOPSID^. 11 



somewhat like PseudostrohUus, but it differs by being imper- 

 forate. Only a single, very much compressed example is 

 known. 



This genus and the preceding may possibly be related to 

 Dimorphoptychia. 



Mollusks erroneously referred to Strohilopsidcs, and 



non-molluscan forms. 



Dimorphoptychia Sandberger. 



Dimorphoptychia Sandberger, Land- und Siisswasser-Con- 

 chyl. der VorAvelt, 1871, p. 149. Monotype Helix arnouldi 

 Michaud. E-illy, Eocene. 



H. arnouldi, pi. 12, figs. 1, 2, 3, has been considered an 

 endodontid, a strobilopsid or a proserpinid snail by different 

 authors. Berthelin, in Bull. Soc. Geol. France (3), XV, 1887, 

 p. 61, found that there was complete removal of the internal 

 partitions, and on that account he referred the genus to the 

 Proserpinidag. 



Because of its blunt, expanded peristome I am inclined to 

 \dew Dimorphoptychia as a member of the Helicinidae, near 

 the genera Calyhium L. Morlet and Heudeia Crosse. 



KANiVBOHELix, new genus. 



The shell is low trochiform, with rounded periphery and 

 broadly expanded lip, within which there are four narrow 

 folds (represented by linear grooves in the cast), subequally 

 spaced, the lower one shortest, more prominent; a parietal 

 tooth present ( f). Type Helix kanahensis, pi. 12, figs. 4, 5, 6. 

 Diam. about 12 mm. 



K.VNABOHELix KANABENSis (White). Helix kanahensis 

 White, in Powell's Rep. on (^-eol. of the Eastern Portion of 

 the Uinta Mountains, 1876, p. 120; Review non-marine fossil 

 Mollusca of N. A., p. 48, pi. 25, figs. 12-14, in Ann. Rep. 

 Director U. S. Geol. S\irv. 1881-2 (1883). Cretaceous, Lara- 

 mie : Point of Rocks Group, Upper Kanab, Utah. Figured on 

 pi. 12, figs. 4, 5, 6. 



In America no Tertiary or old fossils referable to Strohilops 

 have been found. Helix 'kanahensis White was referred to 



