558 PROCEEDINGS OF THE ACADEMY OF [NoV., 



This is Quadrula pyramidata Lea (1834) of Simps. Synops., p. 790, 

 Descr. Catal., p. 888. 



Quadrula cordata Raf. 



Obovaria cordata {Unio cordata) Raf. Monogr. (1820), p. 312, No. 50, PL 82, 

 figs. 6, 7. 



The type is A. N. S. P. Coll. No. 20,221, one valve, from the Ohio 

 River. 



Length 61, height 63, diam. 19 mm. 



This is Quadrula plena Lea (1840) of Simps. Synops., p. 790, 

 Descr. Catal., p. 886. 



Quadrula sintoxia Raf. 



Obliquaria sintoxia {Unio sintoxia) Raf. Monogr. (1820), p. 310, No. 44. 



The type is A. N. S. P. Coll. No. 20,208, from the Ohio River. 



Length 97, height 71, diam. 41.5 mm. 



This is Quadrula suhrotunda Lea (1831) of Simps. Synops., p. 791, 

 Descr. Catal., p. 892. Unio suhrotunda Lea (1831) is preoccupied 

 by Unio suhrotunda Raf. Monogr. (1820), p. 308, No. 38. 



Quadrula obovalis Raf. 



Obovaria obovalis (Unio obovalis) Raf. Monogr. (1820), p. 311, No. 45. 



The type is A. N. S. P. Coll. No. 20,224, from the Ohio River. 

 Length 41, height 46.5, diam. 29 mm. 



This is Quadrula ehenus Lea (1831) of Simps. Synops., p. 793, 

 Descr. Catal., p. 897. 



Quadrula tuberculata Raf. 



Obliquaria tuberculata {U. tuberculata) Raf. Monogr. (1820), p. 308, No. 37. 



The type is A. N. S. P. Coll. No. 20,215, from the Ohio River. 



Length 59, height 54, diam. 29 mm. 



This is Quadrula tuberculata Raf. of Simps. Synops,, p. 795, Descr. 

 Catal., p. 903. 



The following names are proposed by Prof. Rafinesque in Monogr. 

 (1820) which are not mentioned in Simpson's Synopsis: Unio 

 alternata p. 294, angulata p. 315, aurata p. 295, decorticata p. 302, 

 difformis p. 315, fasciolata p. 312, fusca p. 293, fuscata p. 294, lineata 

 p. 314 (not Gmel. 1792), longa p. 304, maculata p. 293, marginata 

 p. 311, nigrescens p. 309, nigrojasciata p. 294, obliterata p. 304, oUvacea 

 p. 295, pallida p. 314, radiata p.- 294, rosea p. 311, semiradiata p. 295, 

 teres p. 312, vermiculata p. 301, zonalis p. 297, Lampsilis pallida p. 

 299, rosea p. 299; Anodonta atra p. 316, cuneata p. 316, mutabilis 

 p. 317, nigrescens p. 317, radiata p. 317 (not Mull. 1774), violacina 

 p. 317. 



