TRANSACTIONS OF WAGNER 

 1476 



TERTIARY FAUNA OF FLORIDA 



i., pp. 139, 212, pi. xxi., fig. 5, 1865) from the Jacksonian of Mississippi near 

 Shubuta. The type of the latter is very minute (alt. circ. i mm.) and may be 

 immature. 



It is notable that in well-explored and especially recent faunas there are 

 usually at least two species of Crassinella of which one is more triangular and 

 solid, and the other flatter, thinner, and larger. The variations in outline, espe- 

 cially of the flatter forms, are considerable, and lead one to think that a diag- 

 nosis of any given species should aim at giving average and not merely indi- 

 vidual characters, in order not to mislead. 



Crassatellites (Crassinella) Guppyi Dall. 

 Crassinella miocenica Guppy, MS. 

 Crassatellites {Crassinella') Guppyi Dall, Proc. U. S. Nat. Mus., xix., p. 326, pi. xxx., 



fig. s, 1896. 

 Crassinella iiiai-tiniceiisis Guppy, Geol. Mag., dec. ii., vol. ii., No. I, Jan., 1875 ; not of 



Orbigny. 



Oligocene of Bowden, Jamaica, Vendryes ; also Bland, Henderson, and 

 Simpson ; " Pliocene" of Matura, Trinidad, Guppy. 



The specimens from Trinidad collected by Guppy appear to be specifically 

 identical with those from Bowden in his collection, now in the National 

 Museum. 



Crassatellites (Crassinella) bo'wdenensis n. sp. 

 Plate 50, Figures 2, 3. 



Oligocene of Bowden, Jamaica ; Bland, Henderson, and Simpson. 



Shell small, thick and solid, plump, subequilateral, the anterior side a little 

 shorter ; beaks small, acute, recurved ; lunule and escutcheon lanceolate, sub- 

 equal, well impressed, smooth ; valves with subequal dorsal slopes and promi- 

 nently arcuate base, sculptured with concentric, close-set, flattened threads, 

 which near the umbones are less crowded and slightly sharper ; hinge solid, 

 strong, normal. Height 3.5, length 3.7, diameter 2.0 mm. 



This is readily distinguished from C. Guppyi by its more convex form, 

 heavy yet smaller shell, and finer sculpture. 



Crassatellites (Crassinella) triangulatus n. sp. 

 Plate 49, Figure 16. 

 Oligocene of the Chipola beds at Alum Bluff, the Macdonald farm on the 

 Chipola River, etc., Calhoun County, Florida ; Burns and Dall. 



