146 PROCEEDINGS OF THE ACADEMY OF 



would ask how I could, when I read ray paper on the 16th March, 1832, be- 

 fore the American Philosophical Society, know of a description in Grifiith's 

 Cuvier dated 1834? (not in 1833, as incorrectly cited). Douglamx therefore 

 cannot have precedeuce " of some years," as claimed for it, but it must remain 

 a synonym to Murchisonianus, where I placed it in my Synopsis, first, second, 

 and third editions, since 1836. 



As regards the claim in the same paragraph for If. Shanffhaiensis, Lea, being 

 also a synonym to Douglasice, I am constrained to differ in opinion. Shanghai- 

 ensis is not the same with IJouglasiir, as affirmed, but it is the same with U. 

 Osbeckii, Philippi, the description of which I had not seen. " Concbylien, vol. 

 3d." Some years since I placed it as a synonym to Osbeckiiin. the manuscript 

 copy of my Synopsis, 4th ed., preparing for the press. 



'2d. Anodonia tenuis, Gray, — also called Unio tenuis, Gray, in Griffith's Cu- 

 vier, — is considered to be, by Messrs. Baird and Adams, an Anodonta, and it 

 is said to be little known. This shell does not belong to either of these 

 genera. It is a true Dipsas of Leach, and if Dr. Gray had had a perfect spe- 

 cimen before him when describing Anodonia tenuis, he never would have 

 placed it in that genus. The Dipsuhiun character was evidently obliterated 

 by age in the sijecimen from which he made his diagnosis. The young spe- 

 cimens, and the mature perfect ones, alwaj^s have the tooth (so to call it) ot 

 the genus Dipsas. I described this species in the Transactions of the Ameri- 

 can Philosophical Society, March 15, 1833, under the name of Symphynota 

 discoidea, with a figure perfectly representing the characteristic tooth, which 

 consists of a single raised, sligtitly curved line under the dorsal margin. In 

 my " Synopsis," in the first edition in 1836, as well as in the second and third 

 editions, I gave Dr. Gray's tenuis as a synonym to this shell, which I there 

 placed in the genus Dipsas, where it properly belongs. It must therefore 

 stand as Dipsos discoidea, Lea, with the synonym of Anodonta tenuis, Gray ; my 

 date being 1833, and Dr. Gray's 1834. 



In this paper of Messrs. Baird and Adams, they have described a supposed 

 new species from Shanghai, under the name of Unio (Lampsilis) subtorius. I 

 previously published a description of a species which I believe will prove the 

 same, under the name of iortuosus, in the Proc. Acad. Nat. Sci. April 18, 1865. 

 Since then I have found in the "Journal de Conchiliologie," July, 1863, — which 

 work for that year was not accessible to me, — that Messrs. Crosse and De- 

 beaux had given a description and an excellent figure of a Unio of the same 

 twisted character, under the name of Tientsinensis, which, if the figure be en- 

 tirely correct, differs in the form of the posterior slope, and in the undulations 

 of that part. 



I may be permitted to express my surprise that neither the French nor the 

 English authors should have observed the very remarkable character of these 

 Chinese species, which were before them, in being inequivalve! The figure in 

 the Journal de Conchyliologie seems to be very correctly delineated by the art- 

 ist, having represented the inequivalve condition of the right and left valves. 



Messrs. Baird and Adams refer to Tientsinensis, but consider it to differ in 

 some respects from their subtortus, which I think very likely. If Tientsinensis 

 prove to be the same as torluosus and contortus, then the two last must be 

 synonyms. If not, then there will be two species, viz. : Tientsinensis, Grosse 

 and Debeaux, and Iortuosus (nobis), — contortus, B. and A., being a synonym to 

 tortuosus. 



May 5th. 

 Mr. Vaux, Vice-President, in the Chair. 



Twenty-nine members present. 



The following paper was presented for publication : " List of 



[May, 



