20 BUI^LETIN 33 20 



altitude 12mm. 



Type and specimens figured. — Pal. Museum., Cornell Univ. 



Geologic horizon. — Midway' Eocene. 



A^m//7)'.— "Bed No. 2, Soldado Rock, Gulf of Paria, Trin- 

 idad." 



Collected b}' A. C. Veatch in 191 2, then of the General As- 

 phalt Company of Philadelphia. 



Astarte trinidadensis, n. sp., PI. 3. Fig.s. 2, 3. 



Description. — Size and shape of the shell as indicated by the 

 figures ; subequilateral ; lower portion of the anterior and poster- 

 ior ends similarly rounded, blunt in outline; surface decorated 

 with six prominent, narrow, raised concentric ribs, the inter- 

 spaces verj" wide, two or three times the width of the ribs. This 

 species differs from A. viaiiriana, n. sp., in the beaks being; 

 more central, in a more rounded posterior end, lower in form and 

 in the character and number of the concentric ribs. In A. 

 trinidadensis the ribs are more pronounced, much narrower and 

 fewer in number. There are less than twice the number of ribs 

 in this species than in our other form of Astarte. Longitude of 

 shell i5min ; altitude lonim. 



Type and specimens figured . — Pal. Mnseum, Cornell Univ. 



Geological horizon. — Midwa}' Eocene. 



Z,^ra/2/j'.^"Bed No. 2, Soldado Rock, Gulf of Paria, Trin- 

 idad." Collected hy A. C. Veatch in 1912, then of the General 

 Asphalt Company of Philadelphia. 



Genus MARC I A H. and A. Adams 

 Marcia parisensis, n. sp., PI. 3 Figs. 4, 5. 



Description. — Size and shape of shell as indicated by the fig- 

 ures ; a slight umbonal ridge extends from the beaks to the pos- 

 terior, ventral margin ; surface ornamented with prominent, con- 

 centric lamellse which are much more pronounced and heavier 

 on the anterior and central portion of the valve, decreasing in 

 size from the posterior umbonal ridge backward. Longitude of 

 shell 1 6mm ; altitude 13mm. 



