TRANSACTIONS OF WAGNER 

 I 104 



TERTIARY FAUNA OF FLORIDA 



This species has much of the aspect of the Oriental forms of the section 

 for which I have revived the name of Hemicardium, but ihis is probably merely 

 an adaptive resemblance, as it is not likely to be genetically connected with them. 



Cardium (Trigoniocardia) Simrothi n. sp. 

 PLATE 48, FIGURE 8. 



Oligocene marls of the Chipola River, Calhoun County, Florida ; Dall and 

 Burns. 



Shell small, oblique quadrate, plump, rounded in front and especially on 

 the anterior basal margin, truncate and slightly alate behind ; beaks high, 

 involute and prosogyrate ; body with eleven broad, flat, rapidly widening 

 low ribs separated by narrow interspaces in which the cross-grooves are so 

 wide that their interspaces appear as narrow, elevated, concentric threads ; 

 ribs on the truncation seven or eight, smaller and more crowded ; when 

 perfect the ribs are surmounted by small pustules, oblong in a transverse sense 

 on the body and drop-like in a vertical sense on the truncation ; internal margin 

 fluted, hinge normal, strong, with very deep sockets and conical teeth. Alt. 

 13, Ion. 9.5, diam. 10 mm. 



In measuring these oblique species the altitude is taken from the point of 

 the valve below to the top of the umbo. This shell much resembles the Caloosa- 

 hatchie species, but is squarer, with the hinge-margin more produced behind 

 and with pustules of a more transverse and different shape. 



Cardium (Trigoniocardia) aminense n. sp. 

 PLATE 48, FIGURE n. 



Oligocene of the Potrero, Rio Amina, St. Domingo. 



Shell elongate, narrow, carinate, very convex ; beaks high and narrow ; 

 body with ten or eleven high flat ribs, the margins overhanging the narrower 

 cross-threaded channels; truncation with ten lower and narrower but very 

 similar riblets ; when perfect the ribs carry a series of, on the body, transverse 

 wedge-shaped nodules with the long slope of the wedge pointing downward; 

 the nodules on the* truncation are smaller and connected, resembling a string 

 of tear-shaped beads with the small end of the drop upward ; internal margin 

 with rather long flutings, hinge normal, shell rather thick. Alt. 14, Ion. 9.5, 

 diam. 12 mm. 



This is the longest and narrowest species, but somewhat more ovate and 

 less pointed than C. aliculum. 



