JSfotes on Specimens of the Oorbiculadce. 189 



that, if it came from America at all, which I hardly believe, 

 as it is so uulike any of our known fossil Qyrenm or rather 

 Corhiculm, it is a native of one of our Southern States. 



The .truncata is labelled as having been purchased from 

 the collection of Valenciennes (the father of the late Prof. 

 Valenciennes). 



Cyrena oblongra, Quoy. 



M. Deshayes has stated* that this species, a native of 

 Vanikoro, has a sinus. .1 called attention f to this fact, 

 remarking that it was the only instance on record of a non- 

 American Cyrena possessing a sinus, qualifying my state- 

 ment, however, with the reservation, that I had never seen 

 any specimen of oblonga. 



On an inspection of the specimen of the oblonga at the 

 Jardin des Plantes, I detected at once that the so-called 

 Cyrena was nothing more or less than a Glauconotne. 



I am enabled consequently to uphold the proposition, that 

 none of the non-American Cyrence have an unbroken pallial 

 impression. 



Cyrena placens, Hanley. 

 Elsewhere J I have quoted Mr. Hanley to the effect that 

 there was a specimen of this species at the Jardin des 

 Plantes. As the placens is not personally known to me, I 

 sought for the specimen in question with some eagerness ; 

 unfortunately, it was not to he found. 



JVote on the "EncyclojJcdie Methodique. " 



Being frequently obliged to consult this work, I was much 

 puzzled to know whether the name of the genus, in many 

 cases a new one, at the top of the plate, was the only evi- 

 dence of the publication of the genus, or whether -there 



*Lam. An. Desh., edit. 



t Ann. Lye. N. H. N. Y., viii, 4'20, 18(i7. 



t Smith. lust. Misc. Coll. Prime, Monog. Corb. 21, 18(i5. 



May, 187-2. 13 Ann. Lvc. Nat. Hist., Vol. x. 



