﻿398 DESCRIPTIONS OF NEW SPECIES OF 



A. (Macrodon) Eufalensis. PI. 68, fig. 38. Inequilateral ; beaks large ; um- 

 bones large and slightly grooved in the middle by a shallow sulcus, which extends 

 nearly to the base of the shell ; area very small ; hinge line straight, lower edge of 

 the hinge slightly curved ; lateral teeth very long ; anterior margin curved, basal 

 sinuous, posterior margin curved, upper part inclined anteriorly ; surface marked by 

 numerous radiating ribs and smaller transverse lines. 



Dimension* s. — Length - 4 in., width *5 in. 



Locality. — Eufala, Ala. Ripley Group. My collection. 



There is a specimen (No. 516) in the collection of the Smithsonian Institution, 

 apparently of this species, 1*8 in. wide. 



. OSTREA, Linn. 



O. crenulimabginata. PI. 68, fig. 40, 41. Subtriangular, sometimes elongated 

 oval ; attached ; portion of the outside of the shell not attached is very squamose ; 

 hinge about an equilateral triangle, central groove of the hinge deep ; internal margin 

 strongly crenate, muscular impression large ; upper valve ? 



Dimensions. — Length 2 - 2 in., greatest width about 2 in. 



Locality. — Found in a marl bank, two miles east of Micldleton, Tenn. Rather 

 common and associated with 0. denticulifera, Con. 



DISCOIDEA, Klein. 



D. occidentals. PI. 68, fig. 42, 43, 44. Circular, ambulacres narrow about four 

 ambulacral plates to one interambulacral ; interambulacral plates narrow, numerous; 

 anus ? obliterated by weathering ; mouth small, central ; under surface marked by 

 numerous small tubercles, placed irregularly ; upper surface, if any existed they have 

 been obliterated. 



Locality. — Cretaceous, Oregon. My collection. 



SERPULA, Linn. 



S. habrogramma. PL 68, fig. 16. Rounded above, attached by a flat base ; sur- 

 face smooth or obscurely wrinkled transversely, and sometimes with two or three 

 longitudinal lines ; aperture round. 



Dimensions. — Width of aperture -06 in., length of tube 15 in. 



Locality. — On the upper valve of Oryplwea vesicularis, from the Yellow Limestone, 

 Long Branch, N. J. Collection of the Academy. 



HAMULUS, Morton. 



H. squamosus, Qabb. PI. 58, fig. 45. 

 Cat. Cret. p. 1, Proc. Acad. Nat. Sci. 1859. 



E. 07iyx, Morton, (pars) Synopsis Cret. p. 73. 



