TRANSACTIONS OF WAGNER 

 978 



TERTIARY FAUNA OF FLORIDA 



small laminae on the posterior dorsal slope ; the type is forty-two millimetres 

 long and about fifteen millimetres high. The teeth and pallial sinus are as in 

 Garum. 



On the same card with Conrad's type in the collection of the Academy of 

 Natural Sciences is another shell thirty-nine millimetres long and seventeen 

 millimetres high, more equilateral, less arcuate, with a blunter and less de- 

 curved posterior end and generally straighter dorsal margin. This is probably 

 a distinct species for which I would propose the name of Psammobia (Garum) 

 claibornensis. It, with the other Eocene species, will be illustrated elsewhere. 

 In the Gregg's Landing beds of Claibornian age Mr. Aldrich has found a 

 specimen of a species having almost exactly the outline of P. chorea Conrad, 

 but which differs from that form by having conspicuous radiating stria; on 

 the dorsal slopes, especially distally, which granulate the incremental ridges. 

 The latter often form in P. eborea small, sharp, concentric waves dorsally, but 

 not raised laminae, as in P. filosa. Aldrich's species is hardly perfect enough 

 to receive a name. 



Genus SANGUINOLAEIA Lamarck. 

 Sanguinolaria Lam., Prodr., p. 84, 1799, and Syst. des An. s. Vert., p. 125, 1801. Type 



Solen sanguinolentus Gmelin (=5'. rosea Gmelin and Lamarck). 



This group may be subdivided as follows: 

 Section Sanguinolaria s. s. 



Shell moderately large, thin, equivalve, short, rose-colored or white, with 

 short, inconspicuous nymphs, two bifid cardinal teeth in each valve ; pallial sinus 

 deep, widest in front, confluent with the pallial line below, the epidermis thin, 

 dehiscent. 



Section Psammotella (Blainville, 1826) Herrmannsen, 1852. Type P. 



operculata Gmelin (= 7V//ia rufescens Chemn.). 



Shell elongate, rostrate, inequivalve, the left valve flattened ; pallial sinus 

 discrepant in the two valves, narrower in front, partly confluent with the 

 pallial line, otherwise like Sanguinolaria. 



Section Soletellina Blainville, 1824. Type Solen diphos Gmelin-. 



Shell large, equivalve, with a conspicuous, dark epidermis and more or less 

 bluish purple coloration, hinge as in Sanguinolaria; sinus narrowing to a point 

 in front, below wholly confluent with the pallial line ; pallial impressions rude 

 and irregular. 



From the elongate, rostrate form of the type the species vary to broad and 

 truncate, forming a transition towards the next section. 



