1855.] 



263 



TURRITELLA, Lam. 



T. alveata, PI. xvii., fig. 7. Elongated; whorls about nineteen; revolving 

 lines prominent, about six in number alternated with a minute line ; volutions 

 excavated at base and minutely striated. 



Allied to T. obmta, Con., (T. litieata, Lea,) of Claiborne, but greatly more 

 elongated. 



Polyparia. 



ENDOPACHYS, Lonsdale. 



1. E. expansum. Cuneiform, dilated, much compressed on the sides ; middle 

 ventricose with two prominent ribs ; end margins straight, direct, obliquely trun- 

 cated inwards inferiorly; medial ridge tapering gradually to the base, which is 

 thickened in the middle; surface regularly and beautifully granulated. 



Locality. Jackson, Miss. Claiborne, Alabama. 



2. E. triangulares Triangular; sides a little undulated on the margin and 

 tapering towards the middle of the base, which is thickened, truncated and 

 rounded, medial elevation very wide, rounded, with two prominent ribs ; sides 

 excavated and suddenly compressed near the margins, which are acutej granu- 

 lations in form of radiating stria?. 



Locality. Occurs with the preceding. 



The sides between the ribs and the depression are convex, and when perfect 

 have probably a rib on the middle. 



3. E. alticost'itum. Cuneiform, subtriangular ; medial elevation tapering 

 gradually to the base, which is thick and irregularly rounded; ribs two, pro- 

 foundly elevated, compressed; lateral depressions profound, margins acute, ob- 

 lique ; suiface densely and minutely granulated; base truncated or obtusely 

 rounded. 



Locality. Claiborne, Alabama. 



FLABELLUM, Les. 



F. Wailesii. Triangular or cuneiform, concentrically somewhat undulated; 

 periphery irregularly subcarinated, sides plano-convex, subcostate, with im- 

 pressed radiating lines, many of them bifurcated; lamellae unequal, three smaller 

 between each of the larger ones ; sides with longitudinal tuberculated stria?. 



Locality. Jackson, Miss. 



OSTEODES, Conrad. 



Form of Turbinolia ; transversely oval; lamellae numerous, anastomosing or 

 branched; centre composed of small, angular cells; submargin with similar 

 but smaller cells ; cellular or bone-like structure characterising the sides beneath 

 the surface. 



Very distinct from Turbinolia or Turbinolopsis. To this genus belong my 

 Turb. cyanthus, from near City Point, Virginia, in the older Eocene ; and T. 

 caulifera, newer Eocene, Vicksburg. 



O. irroratus. Conical, sometimes elongated, recurved, transversely oval ; 

 sides w r ith closely arranged, acute, prominent, densely-granulated striae; lamellae 

 numerous and finely granulated. 



Locality. Occurs with the preceding. 



TURBINOLIA. 



T. luniditiformis. Obtusely conical, with acute, prominent, densely granu- 

 lated ribs; lamellae numerous, unequal, finely granulated, three smaller between 

 the larger ones ; periphery profoundly indented by the prominence of the ribs. 



Locality. Occurs with the preceding. 



