748 NORTH AMERICAN INDEX FOSSILS. 



480. B. (Styliferina) cerithidioides Dall. (Fig. 1083.) 



Oligocenic-Recent. 



Upper whorls angular ; later rounded, with only close-set 

 rounded ribs ; aperture with very faint anterior notch. 



Bowden beds of Jamaica, W. I., Caloosahatchie (Pliocenic) ; 

 Florida and Costa Rica ; Post-Pliocenic, South Carolina ; living off 

 the southeastern coast of the United States. 



CXXXIV. Cerithium Bruguiere. 

 Turreted, non-umbilicate, variously sculptured, and with the 

 aperture bearing a short, backwardly-curved canal, and frequently 

 a notch or short canal, on upper or posterior side of aperture. 

 Columella concave, often with one or two folds. Numerous sub- 

 genera. Jurassic-Recent. 



481. C. bosquense Shumard. Comanchic. 

 Large; apical angle 22-25 ; whorls flattened with 11-12 



broad rounded ribs on each ; moderately distinct above, but be- 



FiG. 1083. Bittium {Styliferina) cerithi Fig. 1084. a, Cerithium obliterato- 

 dioides Dall, X J 3- (Alter Dall.) granosum ; b, C. austinense. (After 



Roemer. ) 



coming obsolete towards lower suture ; aperture ovate, oblique, 

 widest below the middle. 



Walnut shale and Comanche Peak and Goodland limestones of 

 Texas. 



482. C. (Fibula) obliterato-granosum Roemer. (Fig. 1084, a.) 



Comanchic. 



Round-whorled with somewhat depressed sutures and oblique 

 ovate aperture with faint anterior canal (not always preserved) and 



