122 



LEA S SYNOPSIS OF 



o 

 z 



H 



K 

 P-> 



55 

 O 



iz; 





QUADRATE. 



*Nicklinianus.f Lea. 



*ccelatus. Con. " 



*niultiplicatus.:}: Lea. 



Unio heros. Say, in Disseminator. 

 Unio undulatus. Say, Am. Conch. 



No. 2. Deshayes. 

 Unio heros. »S'aj^Ara. Conch. No. 6. 



*undulalus. .Bar. FaZen. ^iZd. Z)esA. 

 Unio costata? Raf. 

 Unio costalus. Con. 



*plicatus. Lesueur. Say. Bar. Eat. Hild. 

 Unio Peruviana. Lam. 

 Unio rariplicata. Lam. 

 Unio Dombeyanus. FaZen. 

 Unio undulata. Desk. 

 Unio multiplicala. i)esA. 



*trapezoides. Lea. 



Unio crassidens. Lam. Var. a. 

 Unio inlerruptus.§ "<Say. 



TRIANGULAR. 



*ambiguus. Lea. 



Caslalia ambigua. Lam. D^Orb. 

 Unio ambigua. Blain. Desk. Sow. 

 Mya ambigua. Wood. 

 Tetraplodon pectinatum. Spix. 



TRIANGULAR. 



Cast. quadrilatera.|l D'Orh. 

 Cast, inflata. D'Orb. 



*foliatus.^ Hild. 



Unio flexuosa ? Raf. 



Unio flexuosus. Con., in text, Mono- 

 graph, page 8. 



Unio foiiatus. Con.y in plate 4, Mo- 

 nograph. 



OVAL. ^ 



*pliciferus. Lea. 



WIDE. 



*multistriatus. Lea. D'Orh. 

 Diplodonellipticumi Spix. 



*subtenlus. Say. Con. 



*Conradicus. Lea. 



*acutissimus. Lea. 



*Murchisonianus. Lea. 

 Unio Douglasiae. Gray. 



*Grayanus. Lea. 



ARCUATE. 



ponderosiis. Lea. 



Mya ponderosa. Solan. Din. 

 Mya crassa. Wood. 



t This distinct and beautiful species was described from a single valve not entirely perfect. When the 

 whole shall be found perfect, I think it likely to prove symphynote. 



X When I described the multiplicatus in 1830, I had had several specimens for two or three years, and was 

 not aware that Mr Say had published a shell under the name of heros, which he subsequently abandoned as the 

 undulatus of Barnes ; but in 1834 reclaimed as heros, I consider that Mr Say's abandonment of the species 

 entitles me to it, if my previous claim be not sufficient. 



§ Mr Say, in his " Synonymy," claims precedence in this species, although my Memoir bears date May 

 1830, while his is December 1831. (See Transylvam^ Journal, Vol. V.) The reader will not after this be 

 surprised to be told that Mr Say does not allow me, in his very incorrect " Synonymy," to be the discoverer of 

 a single new species of Unio from our western waters ! ! I may be allowed also to state, that I do not under- 

 stand why he gives the same name to two of his different numbers : thus, he calls No. 17, U. interruptus, Ra- 

 fin. ; and No. 47, U. interruptus, Say. The species are evidently distinct. 



II I owe to the kindness of M> D'Orbigny specimens of this and injiata. I regret, however, that I am compelled 

 to differ in opinion with this distinguished naturalist, believing, as I do, that there has been as yet observed but 

 one species of Lamarck's Castalia. 



f The male of foiiatus is certainly a triangular shell — the female differs in form very much, having a deep 



