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TERTIARY FAUNA OF FLORIDA 



Solecardia (Spaniorinus) Cossmanni n. sp. 

 PLATE 45, FIGURES 27, 270. 



Miocene of Petersburg, Virginia; Burns. 



Shell thin, nearly equilateral, rounded at both ends, the posterior end 

 blunter, shorter, and higher than the anterior; surface with rather irregular 

 obvious incremental lines, smoother near the beaks ; 'base nearly straight, pos- 

 terior dorsal slope arcuate, descending; anterior arcuate, beaks low, incon- 

 spicuous; right valve with the tooth narrow, slender, in a transverse vertical 

 plane, the anterior dorsal margin expanded slightly just in front of it, the 

 scar of the resilium strong, narrow, oblique ; left valve with the tooth flattened 

 in a horizontal plane, the anterior part longer; interior with faint, obsolete 

 radiations ; adductor scars rather large, ovate ; margins entire. Lon. 8, alt. 

 5.2, diam. 3.5 mm. 



This species has also been found in the Miocene of Maryland at various 

 points by the State Geological Survey, and some of their specimens exceed 

 ten millimetres in length. A single valve was also found at Petersburg which 

 differs from 6". Cossmanni by having a somewhat proportionately longer shell, 

 the two ends being practically equal in height and rotundity, while the interior 

 shows distinct radiations. This may be a variety 'of S. Cossmanni, of which 

 more material is required to decide the range of variation. 



A Scintilla alabamiensis has been described by Cossmann from Claiborne. 

 The Chickasawan supplies a species which has been named by Aldrich Scin- 

 tilla Clarkeana. In the Vicksburgian Conrad has named a Scintilla oblonga 

 which belongs in the group I have called Spaniorinus. Only one left valve 

 is known. A fragment of a species, different from any of the above, but too 

 imperfect to name, was collected by Burns from the Chipola marl. 



FAMILY SPORTELLID^E DALL. 

 Genus SPORTELLA Deshayes. 



Sportella Deshayes, An. s. Vert. has. Paris, i., p. 593, 1858. Type Psammotea dubia 



Desh., Coq. Fos. has. Paris, i., p. 76, pi. 10, figs. 13-14, 1824. 

 Fabella Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, pp. 574, 586, 1863. Type Amphi- 



desma constricta Conr., Med. Tert., p. 76, pi. 43, fig. 10, 1845. 

 Angusticardo Cossmann, Cat. Illustr., ii., p. 17, 1887; section of Sportella. Type Poromya 



rolundata Desh., Cossmann, op. cit., pi. i, fig. 9. 



This genus, though sometimes cited as of 1852, was proposed by Deshayes 

 in 1858. Both Deshayes and Conrad seem to have recognized its characters 



