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. 
Ne cordata (Unio cordata) Raf. Monogr. (1820), p. 312, No. 50, Pl. 82, 
gs. O, / 
The type is A. N. 8. 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 sintowia) Raf. Monogr. (1820), p. 310, No. 44. 
The type is A. N. 8. P. Coll. No. 20,208, from the Ohio River. 
Length 97, height 71, diam. 41.5 mm. 
This is Quadrula subrotunda Lea (1831) of Simps. Synops., p. 791, 
Descr. Catal., p. 892. Unio subrotunda Lea (1831) is preoccupied 
by Unio subrotunda 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. 8. P. Coll. No. 20,224, from the Ohio River. 
Length 41, height 46.5, diam. 29 mm. 
This is Quadrula ebenus 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, Deser. 
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, nigrofasciata p. 294, obliterata p. 304, olivacea 
p. 295, pallida p. 314, radiata p. 294, rosea p. 311, semiradiata p. 295, 
leres 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 Miill. 1774), violacina 
p. 317. 
