50 FASCIOLARIIN^E. 



Sub-Family FASCIOLARIIN^E. 



Subgenus TEREBRISPIRA, Conrad. Shell of medium size, with spire 

 much produced and canal short ; volutions convex, angular, and strongly 

 spirally ridged ; plaits of columella not exposed externally ; outer lip 

 internally sulcated. 



T. ELEGANS, Emmons. PI. 29, fig. 50. Miocene, Alabama. 



Subgenus MESORHYTIS, Meek. Shell agreeing nearly with Peistocheilus 

 in form, but with plaits of columella stronger, comparatively little oblique, 

 and exposed directly opposite the middle of the aperture ; surface with 

 fine spiral striae, and vertical costae. 



M. GRACILENTA, Meek. PI. 29, fig. 51. Cretaceous, Yellowstone River, 

 150 miles from its mouth. 



Has the folds of a Mttra, rather than a Fascioluria, and Meek refers it 

 with considerable doubt to its present position. 



Subgenus CRYPTORHYTIS, Meek. Shell generally under medium size, 

 with volutions convex, but constricted above, and provided with regular 

 vertical costaa or small folds ; plaits of the columella very oblique, not 

 exposed in a direct view into the aperture, and occupying a higher position 

 than in the typical group ; outer lip smooth within. 



C. CHEYENNENSIS, Meek and Hayden. PI. 29, fig. 52 (from a cast). 

 Cretaceous, DakotaJi. 



Subgenus LIROSOMA, Conrad. Subpyriform ; ribbed, beak narrow and 

 produced, slightly recurved ; one long, very oblique plait at the angle of 

 the columella. 



L. BULCOSA, Conrad. PI. 29, fig. 53. Miocene, Maryland. 

 Its pertinence to this genus is very doutful. 



Genus FASCIOLINA, Conrad. Fusiform ; columella nearly straight 

 to the extremity of the beak ; one prominent oblique fold on the columella, 

 situated above the middle of the aperture. 



F. WOODII, Gabb. PL 29, fig. 52. Miocene, New Jersey. 



The only figure does not exhibit the aperture, but Conrad states that 

 the fold is situated more remote from the beak than in any other genus 

 except Cuma. 



CORDIERIA, Rouault. This genus is synonymous with Borsoma, and is 

 a member of the family Pleurotomidse. Conrad, however, has referred 

 fossil Fasciolarise to it. 



WHITNEYA, Gabb. Pal. Calif., I, 205. 



This is said by its author to have some resemblance to Fnwiolftri-a ; I 

 have referred it to Purpurinae, as a distinct generic group related to 

 Melapium. See Manual, Vol. II, p. 214, pi. 68, fig. 397. 



