205 



It does not reach the attributed magnitude of M. crenafufi, Lam., 

 a species which was supposed by that author to inhabit the coast of 

 Carolina; but if either of the different figures of Lister, Sowerby, 

 or that of the Encyclopa3dia Methodique is a tolerably correct 

 representation of it, I have certainly not met with it. PI. 50. 



[Notes on 4th page of cover of part v.] 



Add to the synonyms of ilf. papuana, Lam. Lister, pi. 1057. 



la the observations on Sigaretjis perspectivus in No. 3, I remarked its 

 striking similai-ity to Cryptostoma Icachii, Blainv. On further compari- 

 son I find that it cannot be generically sej^arated from that species, and 

 the reader is tlierefore requested to alter the name to Cryptostoma per- 

 spectiva, nob. Analogy also indicates the change of Sigaretus niaculatus, 

 nob., Cryptostoma maculata. We shall in our next number give the 

 generic character of Cryptostoma, to be substituted for that of Sigaretus, 

 which latter can be retained until we publish a species of that genus. 

 In the 2d edition of the Regne Animal, Cuvier, in a note to the genus 

 Cryptostoma, says, that a species was sent from Carolina by Mr. L'Her- 

 menier. This was doubtless one of the above, perhaps the perspectivus, 

 nob., and to which he gives the name of Cr. carolinum, Cuv., not being 

 aware that I had long since described it. 



Of Unio glehulus, N., Mr. Barabino has recently sent me some fine 

 specimens from Bayou Teche, one of which is four inches and three- 

 tenths broad, and two inches and four-fifths long. 



A Venericardia was presented to me several years since by my brother, 

 who obtained it on the coast of New Jersey. I described it under the 

 name of cribraria, but as the specimen is imperfect I did not publish an 

 account of it. It is longitudinally ovate-orbicular, with twenty slightly 

 elevated ribs, more distant from each other than their width, decussated 

 by concentric, almost equally elevated lines. Length one inch and 

 about three-twentieths, and breadth one inch and one-twentieth. 



Can this be a variety of the borealis of Conrad ? Having but a single 

 specimen I cannot determine this question. 



[Am. Con., part vi., April, 1834.] 



Unio nexus. — Desc. Shell transversely triangular, subrhomboi- 

 dal, much inflated, thick ; beaks prominent ; anterior side much de- 

 pressed, in its middle elevated so as to make an almost rectilinear 

 hinge margin, with a broad, shallow groove, which extcndsfrom the 

 beak to the anterior margin; anterior margin forming nearly a right 



