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1437 



TERTIARY FAUNA OF FLORIDA ^ ' 



Subgenus Carditella E. A. Smith, 1881. Type C. pallida Smith. Recent. 

 Magellan Strait. 



Shell minute, trigonal, radially sculptured, with two cardinals in each valve, 

 of which the right posterior one is ill defined ; the resilium is sunken above and 

 behind the two cardinals., the ligament as in Erycinella; there is an anterior 

 and posterior lateral in each valve ; the ligament is feeble ; dental formula, 



L. oi.orioi.oi 



R. io,iroio.io jr 



Subgenus Carditopsis Smith, 1881. Type C. ftabellum Reeve. 



Shell like Carditella, but the ligament obsolete and the resilium sunken be- 

 tween the beaks much as in Erycinella; dental formula, L - oi-iiroto.io > the posterior 



R. io.oionoi.oi 



left cardinal obscure. 



I am indebted to Mr. E. A. Smith, of the British Museum, for sketches of 

 the types of this and the preceding group which have enabled me to present 

 their characters clearly. The little Erycinella ovalis of S. V. Wood (not of 

 Conrad), from the Coralline Crag of Britain, stands almost exactly intermediate 

 between Carditella and Carditopsis. 



Genus Condylocardia Bernard, 1897. Type C. pauliana Bernard. Recent, St. 

 Paul, Stewart Island, and St. Helena. Fossil in the Parisian Eocene. 



Shell minute, with conspicuous prodissoconch, the hinge-teeth only partially 

 emerging from the nepionic state, so that it is difficult to decide what portion 

 of a continuous lamina shall be called cardinal and what part lateral. After 

 experimenting with varous formulae I conclude that the laminae of the type 

 species may be represented by L - I - IortoI - and those of C. australis by L - OIOiro1 - 01 



R. o.oiroio.i R. io.iorio.io' 



Erycinella having the formula L - .r 1 -*, so that when we consider the very 



R. i.oirio.o 



amorphous and undeveloped condition of the laminae in Condylocardia the rela- 

 tionship and essential similarity of the apparently diverse hinges is tolerably 

 plain; the internal margins are feebly crenate or plain; the form rounded or 

 subtrigonal, the sculpture concentric or, more generally, radial. The animal is 

 viviparous, another linkage to the Carditidce. 



This type has not yet been found fossil in the American Tertiaries. 



Genus ERYCINELLA Conrad. 

 Erycinella Conrad, Fos. Medial Tert., p. 74, Jan., 1845;' Proc. Acad. Nat. Sci. Phila. for 



1863, P- 578, 1864; ibid, for 1864, p. 212. 

 Erycina Orbigny, Prodr. Pal., iii., p. 115, 1857. 



