82 POST-PLEIOCENE FOSSILS. 



TURBONILLA— Risso. 



This genus comprises a great number of small and extremely beautiful shells which have 

 tne whorls longitudinally ribbed or cancellated, and the inner lip simple and toothless. — 

 H. <Sf A. Adams. 



TURBONILLA S P E I R A 

 Plate XIII. Pig. 1, la 



Chemnitzia speira, Ravenel, Proc. Elliott Society Nat. Hist., Vol. 1, p. 280. 



Description. " Shell turreted, very slender and pointed, glossy white ; whorls ten, 

 nearly flat, reticulated with numerous ribs and interrupted revolving lines ; suture well 

 defined, with a distinct, impressed, revolving line a little below it, leaving a raised space 

 like a crimped fillet, wrapped around the shell ; aperture about a sixth the length of the 

 shell, ovate, with the posterior angle sharp." — E. Ravenel. 



Our specimen, from which the figure is drawn, has the apex broken off. 



Plate XIII. Fig. 1, Natural size. 

 " la, Magnified. 



Locality. Cainhoy; Simmons'; Wadmalaw. 



Museum, College of Charlestoti; Cabinets Dr. Ravenel aiid F. S. H. 



TURBONILLA EXARATA. 

 Platk XIII. Figs. 2, 2a, 26. 



Pasithea exarata, H. C. Lea, Trans. Phil. So. Phila., Vol. ix, p. 25. 



Pasithea exarata. Lea, New Foss. Shells, Ter. of Virginia, p. 25, pi. 35, fig. 44. 



Chemnitzia exarata, d'Orb., Prod, de Paleontologie, Vol. 3, p. 33. 



Description. Shell subulate accuminate, thick, imperforate, shining, costate; spire 

 attenuate, mammillate, smooth at apex ; sutures deep, excavated ; whorls fifteen, flattened, 

 with numerous flat, obliquely longitudinal ribs ; last whorl angulate ; base smooth, polished ; 

 mouth small, sub-quadrate, somewhat eff'use.' — H. C. Lea. 



The above is Mr. Lea's description, to which we may be permitted to add what to us 

 seems a very important character : grooves between the ribs smooth and deep, not extend- 

 ing quite to the sutures. 



