FRKh: INSTITUTE OF SCIENCE 



615 



TERTIARY FAUNA OF- FLORIDA J 



they merge into one another through their peripheral species. Such are the 

 following : 



Group of A. barbata L. (Barbatia s. s.). This includes A. (B.) tnifsissippiensis 

 Conrad from the Vicksburgian Oligocene. 



Group of A. canditia Gmelin (Calloarca Gray, 1857, + Plagiarca Conrad, 

 1875).* This includes A. ciicnlloidcs Conrad (+ A. lima Conrad, 1847, 

 not of Reeve, 1844, = A. Conradi Desh.) from the Jacksom'an ; A. mary- 

 laudtca Conrad and A. arciila Heilprin, Upper Oligocene and Older Mio- 

 cene ; and several other species. Litharca (lithodomus) Gray, 1840, is 

 probably based on a specimen of A. Candida, which had grown in the 

 burrow of a Lithodomus. Upper Cretaceous to recent. 



Group of A. propatitla Conrad (Granoarca Conrad, 1862) = A. hians Tuomey 

 and Holmes, 1855, not of Brown, 1842 ; nor of Reeve (? = A. protracta 

 Rogers, 1837, not of Conrad, 1847). Miocene. 



Group of A. ccntcnana Say (Striarca Conrad, 1862). Miocene. 



Group of A. donaciformis Reeve (Acar Gray, 1847, ~f~ Daphnodenna Morch, 

 1853, + Fossularca Cossmann, 1887). Eocene to recent. 

 In Striarca the lozenge occupied by the ligament and its transverse 

 grooves for the resilium cover the entire cardinal area ; in typical Acar the 

 lozenge is obliquely directed backward, leaving the anterior part of the area 

 bare; in Fossularca the lozenge is small, very short, and directly between the 

 beaks, leaving a bare space before and behind it. A. ccelata Conrad (A. Adainsi 

 Shuttleworth) is a typical Fossularca. 



Group of A. heterodonta Desh. (Lcs Cncullaires Desh., 1860; Cncullana Conrad, 



1869, + Nemodon Conrad, 1869). Cretaceous (Ripley) to recent. 



In the Barbatias as well as in Glycymcris (Pcctiiiiciilns auct.) the growth of 



the shell often results in a greater or less absorption of the middle part of the 



series of teeth ; the distal teeth are always more or less oblique, especially 



those behind the beaks. In Cncullaria the latter are almost, if not quite, 



*/>/,;;' iiirca is based on Barbatia carolineiisis Conrad, 1875 (Ripley beds of North Carolina), 

 not Area carolincnsis Wagner, 1847, nor A. (Noc/ia) carolinensis Conrad of 1862. Polynemn Conrad 

 (Kerr. Geol. Rep. N. Car., 1875, App. A., p. 4), based on Bm-hntiii lint Conrad, 1875 ( not Area 

 li>iti-<i Conrad, Dead Sea Kxpcdition, 1X52), does not appear to differ from riu^inrcn or Calloarca in 

 any characters of importance. '1 lie name I\'lyiieina is, at any rate, preoccupied in Entomology since 

 1833. Nnviciihi asfersa Conrad and Barbalia asftrsa Conrad, 1855 (not of 1'lulippi, 1836), are 

 synonymes of A. citcul. 



