OP CONCHOLOGY. t5 



Synonymy of the species of Strepomatidse, a family of Ful- 

 vialile 3Iolhtsca, inhabiting North America. Part 2d : 



BY GEORGE W. TRYON, JR. 



This part is occupied by the genus Ooniohasis entire, except 

 a group of about sixty species from Alabama, which form the 

 subject of part -ith, just read to the Academy. 



A synonymy of the genus shows no less than ten synonymic 

 names. 



The species, numbering 216 adopted names and 113 syno- 

 nyms are divided into the following groups : — 



a. Shell spirally ridged^ f. Shell bi-mrdti-angulate, 



b. " tubercidate, g. " clavate, smooth, 



c. " plicate, h. " elevated, smooth. 



d. " ungulate, _ i. " " striate. 



e. " carinate, 



No. 2, March and April, 1864. 



Synonymy of the family Strepomatidse, &c. Part. Zd : by 



GEORGE W. TRYON, JR. 



This part embraces : — 



Schizostoma 26 species and 17 synonyms. 

 Amulosa, 33 " " 40 " 



Descriptions of six new species af Unionidse, from Lake 

 Nyassa, Central Africa : by isaac lea. 



Unio Kirkii, Spatha alata, 

 " Nyassaensis, " Nyassaensis, 

 " Aferula, " rnodesta. 



Descriptions of six new species of Succinea of the United 

 States : by isaac lea. 



Succinea Haleana, Alexandria, Louisiana. 

 " Grosvenori, Alexandria, Louisiana. 



and Santa Eita Yalley, Kansas. 

 " Mooresiana, Platte River. 

 " Wilsonii, Darien River. 

 " Forslieyi, Rutersville, Texas, 

 " pellucida, United States. 



Mr. Lea publishes a reclamation of his former species of 

 Succinea, eight in number. We certainly are disposed to 

 admit the validity, of not only those species conceded by 

 Messrs. Gould & W. Gr. Binney to be good ones, but also most 

 decidedly, that of S. inflata. With S. retusa and S. Wardiana 

 we are not autoptically acquainted. 



Description of a new Species of Planorhis : by isaac lea. 

 PI. BilUngsii, Ottawa River, Canada West. 



