'U isr 1 0-. 



31 



OVAL. 



Mya Gaditana. Lin. Schreih. 



Unio spuria. Lam. 



Unio triradiata. MSS. in Museum at 



Paris. 

 Unio ftdmineus. Phili. 

 Potamida corrugata. Swain. 

 Naia corrugata. Swain. 



Burtoni. Woodiu. Peeve: 



Inclicus. Sow. Peeve] 



^Tavoyensis. Gould. Plan. 

 Unio jjarma. Ben. 



*crespisxilcatus. Ben. Blan. 



*occatus. Lea. Blan. 



*asperulus. Lea. 



*pliciferus. Lea. Chenu. Han. 

 Unio carhonarius.^ Lea. Chenu. 

 Unio plexus. Con. 

 Unio cTOcodilorum. More. 



*rusticus. Lea. Mart. 



climinutus. Lea. ' 



*laticostatiis. Lea. 



*hippop8eus. Lea. 



'OBLONTG. 



*Sloatianus. Lea. Chenu.. 

 Unio aratus. Con. 

 Unio plectoforus. ■ Con. 



*rufofuscus. Lea. 



navigioliformis. Lea. 



plicatulus. Lea.' 



liyliBus. P^Orh. Scliom, 

 Unio Guarianus. P^Orh. 



*trapezoides. T^ea. Chenu. Han. 

 Unio crasside7is. Lam. Var. a. 

 Unio interruptus.^ Say. Pesh. 



Homsensis. Lea. 



SUBROTUND. 



*Brazosensis. Lea. 



*LinceciimiiJ Lea. 



*elliptious. Spix. Mori. 

 Piplodon ellipticum.^ Spix. 

 Unio multistriatus. Lea. P^Orb. 



Hem. 

 Unio psammactinus. Phili. 



*Japanensis. Lea. 



*cucunioides. Lea. Chenu. 

 Unio Cumingii. Punh.* 



' U. carbonarius is the old and eroded of j^Hciferus. 



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

 May, 1830, while his is December, 1831. (See Transylmnia 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 I may be allowed also to state, that 

 I do not understand why he gives the same name to two of his diflferent numbers: thus, he calls No. IT, 

 U. interruptus^ 'Ra.^n.; and No. 41, U. iriterrujjtus, Say. The species are evidently distinct. 



^ I have no doubt of D. ellipticum being the same with my Unio multistriatus, and it is a true Unio. 

 Mr. Barnes gave the same specific name to an American Unio, but it had been previously described by 

 Lamarck as ligamentinus. 



* Comes from Eichmond River, Australia. Zeitschrift fiir Malak., 1846, p. 109. 



