UXIO, 



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OVAL. 



Mya Gaditana. Lin. Schreib. 



Unio spuria. Lam. 



Unio triradiata. MSS. in Museum at 



Paris. 

 Vh io fu 1m incus. Ph Hi. 

 Potamida corrugata. Swain. 

 Naia corrugata. Swain. 



Burtoni. Woodiv. Peeve. 



Indicus. Sow. Peeve. 



*Tavoyensis. Gould. Plan. 

 Unio parma. Pen. 



*crespisulcatus. Pen. Plan. 



*occatus. Lea. Plan. 



*asperulus. Lea. 



*pliciferus. Lea. Chenu. Han. 

 Unio carbonarius} Lea. Chenu. 

 Unio plexus. Con. 

 Unio crocodilorum. More. 



*rusticus. Lea. Mart. 



dirninutus. Lea. 



*laticostatus. Lea. 



*hippopseus. Lea. 



1 U. carbonarius is the old and eroded of plicife.ru :s. 



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

 May, 1830, while his is December, 1831. (See Transylvania 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 understand why he gives the same name to two of his different numbers: thus, he calls Xo. 17, 

 U. interrupt us, Rafin.; and No. 47, U. interruptus, Say. The species are evidently distinct. 



3 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. 



1 Comes from Richmond River, Australia. Zeitschrift fur Malak., 184G, p. 109. 



OBLONG. 



*Sloatianus. Lea. Chenu. 

 Unio aratus. Con. 

 Unio plectoforus. Con. 



*rufofuscus. Lea. 



navigioliformis. Lea. 



pliratulus. Lea. 



hylaeus. D'Orb. Sehom. 

 Unio Guarianus. P'Orb. 



*trapezoides. Lea. Chenu. Han. 

 Unio crassidem. Lam. Var. a. 

 Unio interruptus. 3 Say. Desk. 



Hornsensis. Lea. 



SUBROTUXD. 



*Brazosensis. Lea. 

 *Lincecurnii. Lea. 



WIDE. 



*ellipticus. Spix. Mori. 

 Diphdon ellipticum? Spix. 

 Unio multistriatus. Lea. D'Orb. 



Han. 

 I 'n io psammactinus. Ph ill. 



*Japanensis. Lea. 



*cucumoides. Lea. Chenu. 

 Unio Cumingii. Dunk.* 



