92 AMERICAN JOURNAL 



L. acutissima, Sydney Harbor, New Soutli Wales. 



" pyramidaUs, Habitat 1 



" suhventricosa, " ? 



" vincta, " ? 



Niso, 1 plate ; May, 186G. 

 JV. Sandwichensis, Sandwich Islands. 

 Potamides^ 1 plate ; May, 1866. 

 Unio, plates 39 to 42 ; May, 1866. 



The locality of Unio ziczac is erroneously given as "South 

 Carolina." It is a northwestern species. U. ligameiitinus, 

 Lamarck, is made a synonym of U. crassus, Say, although the 

 former was the first described. In describing Unio vifucatus, 

 reference is made to " Conrad, Shells of New South Wales" in- 

 stead of "New Fresh Water Shells,'' apiece of carelessness 

 Buch as we have too often noticed in the Conchologia. Unio 

 Nyassce, described by Sowerby in this work as a new species, is 

 the same as U. Nyaasaensis, Lea, Proc. Acad. Nat. Sciences, p. 

 109, 1864, and illustrated on plate 13, fig, 33, of the 6th vol. of 

 their "Journal." 



The new species are 



Unio Cambojensis, Sowerby, Cambodia. 

 " /Swinhoei, Reeve MS. " 



Ccnchologia Iconica. By Lovell Reeve. Parts 258, 259. 

 Tellina, 10 plates. July and August, 1866. 

 The following is new : — 

 T. suhtrigona, Sowerby. 



Pleiodon, 2 species. 



Mr. Conrad, in the present number of our Journal, separates 

 his P. 3rMurtrei from the synonymy of P. ovatus. 



Unio, plates xliii. to xlvi. inclusive ; August, 1866. 



No new species are described. Sp. 235. " Unio ventricosus 

 Barnes'' is Unio capax, Green. 



U. tenuissimus, Lea, is figured from a male specimen, and the 

 description does not include the very curious female shell. 



U. Gundlachi, Dunker, is described without locality and 

 figured from a poor specimen. The locality is Cuba. U. saani- 

 natus, Morelet, is the male form of the same species. 



