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TERTIARY FAUNA OF FLORIDA '^^^ 



in the recent fauna would seem to indicate that it might be expected in the 

 several horizons of the Tertiary, including the Eocene, where Conrad, on we 

 know not what evidence, placed his T. gracilis; yet, as a matter of fact, all 

 the specimens accessible to me are certainly or probably upper Cretaceous. 



Genus ARGYROTHECA Dall, 1902. 



{Cistella Gray, 1850, not Gistel, 1848.) 



Argyrotheca Schucherti n. sp. 



Plate 58, Figure 8. 



Miocene marl of Jackson Bluff, Ocklockonnee River, Florida ; Vaughan. 



Shell smali, solid, transverse when young, more rounded when adult; haemal 

 valve flatfish, slightly concavely flexuous mesially ; ventral valve convex, with 

 a wide, moderately elevated beak, a very wide subtriangular foramen, with ob- 

 solete, narrow, widely separated deltidial plates, and a triangular flat area as 

 wide as the valve ; haemal valve with a straight cardinal margin ; internally 

 with a strong, high mesial septum, thicker at the posterior edge ; external 

 sculpture of about twenty feeble, ill-defined radial ribs, separated by narrower 

 shallow furrows. Length of adult 7.5, breadth 8.0, maximum diameter 5.3, 

 height of beak above the cardinal margin 1.7 mm. 



This species is somewhat intermediate in character between the transverse 

 recent A. Barrettiana Davidson, and the narrower, strongly ribbed A. liitea Dall. 

 It has not the dentate septum and strong sculpture of the latter, and except 

 when young, like the specimen figured here, is less transverse, and has its 

 septum less near the cardinal margin than the former. It is named in honor 

 of Mr. Charles Schuchert, of the National Museum, whose " Synopsis of Amer- 

 ican Fossil Brachiopoda" is well known to students of the group. 



Genus PLATIDIA O. G. Costa. 

 Platidia marylandica Clark. 



Platidia marylandica Clark. 



Eocene of the Aquia horizon. Upper Marlboro, Maryland ; Clark. 



Larger and coarser, but very similar in a general way to the recent P. 



anomioides Scacchi. 



Family TEREBRATELLID^. 



Genus TBRBBRATALIA Beecher. 



Terebratalia spitzbergensis Davidson. 



TerebraUila spitzbergensis Davidson, Proc. Zool. Soc. Lond., 1852, p. 72. 



Pleistocene of Riviere du Loup, Canada; Uddevalla, Sweden, and Chris- 



tiania, Norway ; living in cold Arctic or abyssal waters from Spitzbergen south 



