TRANSACTIONS OF WAGNER 

 1506 



TERTIARY FAUNA OF FLORIDA 



horizon, though described from a fragment, is probably a Cardiomya. The 

 following species will be treated a little more at length : 



Cuspidaria (Cardiomya) craspedonia n. sp. 

 PLATE 57, FIGURE 17. 



Oligocene of the Bowden, Jamaica, marls ; Henderson and Simpson. 



Shell small, plump, rostrate, the disk sculptured with numerous elevated, 

 simple, radial threads, with, in the interspaces, from one to three much finer 

 subequal threads, the whole crossed by fine concentric lines of growth ; the 

 major radials increase somewhat in prominence near the posterior end ; beaks 

 low, submedian, inconspicuous ; rostrum small, short, slightly recurved, sub- 

 truncate terminally, sculptured concentrically, with a single feeble thread ex- 

 tending from the beaks to the lower posterior extremity ; hinge normal, fossette 

 very small ; interior basal margin fringed by small projections corresponding 

 to the major radial sculpture. Length 4.0, height 2.5, diameter 2.0 mm. 



This species is probably the one referred by Guppy to C. alternata Orbigny, 

 a recent form which it resembles, but which is larger and has the rostrum 

 radially sculptured with numerous threads. 



Ouspidaria (Bowdenia) distira n. sp. 

 PLATE 57, FIGURE 16. 



Oligocene marl of Bowden, Jamaica ; Henderson and Simpson. 



Shell small, plump, with elevated beaks nearly centrally situated, attenu- 

 ated, rostrate, and compressed behind ; sculptured with two strong threads, 

 one on the anterior dorsal slope and the other near the posterior border of the 

 disk, which by its projection angulates the basal margin ; between these two 

 the surface is finely, radially striate, and a few nearly obsolete striations occur 

 behind the posterior thread ; rostrum compressed, straight or a little decurved, 

 nearly smooth, a few faint radial striae on its dorsal aspect, rounded terminally ; 

 hinge as described in the diagnosis of the subgenus ; basal margin entire except 

 where the radial thread forms a small projection. Length 3, height 2, diam- 

 eter 2 mm. 



This little shell recalls Luzonia monosteira of the recent fauna, but has a 

 different hinge. 



Ouspidaria (Cardiomya) ornatissima Orbigny. 



Sphena ornatissima Orbigny, Moll. Cuba., ii., p. 286, 1846; atlas, pi. xxvii., figs. 13-16, 

 1845- 



