24 



SYNOPSIS OF 



m 

 w 

 z 

 O 



D 



H 

 H 



O^ 

 Z 



s 

 >« 

 cc 



z 

 o 

 z 



WIDE. 



*lanceolatus.t Lea. 



*Anoclontoides. Lea. 

 Unio teres ? Raf. 

 Uuio teres. Com. 



*parallelopipetloti. Lea. D'Orb. 



*platyrhynclius.t Rossmaesler. 



*Cailliauclii. Fer. 



*ovalis. Flem. Sow. 



Mytilus angustior.§ List. 



Mya ovalis. Monta. 



Myaovata. Don. Mat. Wood. Dill. 



Mya depressa. Don. 



My sea sol id a. Turt. 



Unio nodulosa. Lam. 



Unio tumida. Retz. Pfeif. JVil. 



Unio Michaudiana 1 Des Moul. 



Unio ovata. Bouil. 



Unio lostrata. Stud. 



Unio Limagnae. Bouil. 



*pictorum. Lam. Pfeif. Drap. Blain. 



Crouch. Flem. Des Moul. Grat. 



Bouil. 

 Mya pictorum. Lin. Poli. Dill. 



Wood. Mat. 

 Mya corriigata Maroccana.|| Chem. 

 Lonii thick horse mussel. Peliv. 



m 

 W 

 Z 



o 

 z 



i 



33 



cn 

 Z 

 O 

 Z 



WIDE, 



a 



Mya anguslala. Schrcet. Klein. 



Mysca pictorum. Turt. 



Unio rostrala. Lam. Pfeif. Mich. 



Desh. Bouil. 

 Unio manca. Lam. 

 Unio elongatula. Miihl. 

 Unio Tin tonii. Payraud. 

 Unio Capigliolo. Payraud. 

 Unio Requienii. Mich. 

 Unio Deshayesii. ./IfjcA. 

 Unio limosa. JViZ. 

 Unio longirostris. Zeigl. 

 Unio Limovianscae. i^er. 



*elongatus. P/e'/. 



prodiictus. Con. 



*nasiUus. Say. Barn. Swain. 

 Unio rostratus. Valen. 

 Mya nasuta. Wood. 

 Uuio subrostratus? (Sny. 



*Fisherianiis. Lea. 



*Jayensis. Lea. 



*higubris. Lea. 



*niarginalis. Lam. 



Unio anodonlina. Ln»n. 



t M. Desliayes (2d edit. Lamarck) doubts if lanceolattts be not the young of .Inodontoides. The first has been 

 found only in the waters east of the Alleghany mountains, the last only in tlie western waters. There cannot 

 be a doubt of their being distinct species. In size they differ altogedier. 



X This is a curious and very interesting new species which I recently received from Vienna. Its habitat is 

 Carynthia. 



§ On the authority of Fleming. 



il Chemnitz figures this shell, Vol. VI. table 3, fig. 23 & 24. From the description and outline, I have 

 litde doubt of its being a young /jie/on^m, more than usually undulated in the region of the beaks. Its being ru- 

 gose over the whole surface, as mentioned by him, is not evidence against its being such. As the first growth 

 subsequently forms the beak of the shell, it ought of course to be rugose, if that be the character of the shell. 

 The inside view is without teeth, but this is doubtless the fault of the draftsman or engraver, as the author 

 speaks of the hinge being like the common mussel. 



