326 NEW UNIONID^, MELANID^, ETC., 



RemarTcs. — A single specimen of this beautiful and interesting species was submitted 

 to me by Mr. Anthony as the property of Yale College, with permission to describe 

 it if new. It is remarkable for the beauty of its epidermis, which is covered with 

 green rays over nearly the entire disi?;, the posterior slope having two rather thin 

 rays on each valve. There are but two marks of growth on this specimen, being 

 unusually distant. Tlie corrugations come down one-third the distance from the tips 

 of the beaks. There is no sj)ecies which I know of which can be confounded with 

 this, unless it be U. Lampreyanus, Baird and Adams, which species I have not seen. 

 But it is evident from their description and figures (Zool. Journ., part 2, 1867) that 

 the species are distinct. Lampreyamis is described and figured as being much 

 plicated, compressed and solid, as well as being subtriangular, neither of which 

 characters apply to Cldnensis. The specimen under view came from Hong Kong, 

 but I suspect it has been taken there from the north of China. If it had been a 

 native of the province of Quang-Tong, the commerce of Canton would certainly have 

 furnished it among the immense number of shells which it has supplied Europe and 

 America within the last century. 



In vol. 4 of the Journal of the Academy of Natural Sciences (Observations on the 

 Genus Unio, etc., vol. 6) I published descriptions of the soft parts and embryonic 

 forms, with figures, of many of the species of the Unionidce. In subsequent volumes 

 I continued to describe these forms whenever I had been able to obtain them. 

 Through the kindness of Professor Henry I have before me the soft parts of several 

 known species, and some which are new, from Vera Cruz, Mexico, which were sent 

 by Dr. Strebel to the Smithsonian Institution. It is greatly to be regretted that these 

 seem to have been taken at a period of the year when the ovarium was empty of ova, 

 and the branchial uteri without embryos. To these descriptions I add others of the 

 soft parts of some species from Alabama, which were kindly sent to me in alcohol by 

 Dr. Showalter, of which species the hard parts, or outward covering only, have been 

 described. 



Unio loliciferus, Lea. Vera Cruz. — Among a large number none had ova in the 

 ovarium, nor embi'yonic shells in the branchial uterus. BrancJiice large and rounded 

 below, inner one much the larger, free the whole length of abdominal sack. Palpi 

 small, elliptical, united above. Mantle thin, thicker on the edges. Branchial opening 

 large, with numerous small papillse on the inner edges, which are of a dark brown 

 color. Anal opening rather large, with very numerous small papillae on the inner 

 edges. Super-anal opening rather small, united below and colored on the edges. 

 Color of the mass white. 



TJnio umhrosus, Lea. Vera Cruz. — Among a number, none of these, like pllciferus, 



