NATURAL SCIENCES OF PHILADELPHIA. 189 



Description of a new genus of Choerojulis from North Carolina. By 

 Theo. Gill. 



On an unnamed generic type allied to Sebastes. By Theo. Gill. 



Notes on the Picidae, with descriptions of new and little known 

 species. By John Cassin. 



Description of a new species of Unio and a Monocondyloea from 

 Siam. By Isaac Lea. 



July 2$th. 



Mr. Cassin in the Chair. 



Nine members present. 



On report of the respective committees, the following papers were 

 ordered to be published: 



Description of Eleven New Species of EXOTIC UNIONIDJE. 

 BY ISAAC LEA. 



Unio demcatcs. Testa laevi, elliptica, subinflata, inaequilaterali ; valvulis 

 6ubtenuibus ; natibus prominulis, ad apices undulatis et granulatis ; epidermide 

 straminea, eradiata; dentibus cardinalibus parvis, compressis, crenulatis, in 

 utroque valvule* duplicibus ; lateralibus sublongis, lamellatis rectisque ; mar- 

 garita albida et iridescente. 



Hab. River Orontes, Syria. C. M. Wheatley. 



Unio Bourguignatianus. Testa laevi, obliqua, inflata, inaequilaterali, ad 

 latere parum planulata ; valvulis percassis, antice crassioribus ; natibus 

 prominentibus, tumidis ; epidermide, straminea, eradiata ; dentibus cardinali- 

 bus magnis, erectis, in utroque valvulo duplicibus, subcompressis, corrugatis 

 crenulatisque ; lateralibus praelongis, crassis, corrugatis subcurvisque ; mar- 

 garita. alba et valde iridescente. 



Hab. Tigris River at Mosul, Asia Minor. C. M. Wheatley. 



Unio dignatus. Testa laevi, valde obliqua, inflata, ad apices turmida, valde 

 inaequilaterali, ad latere parum planulata ; valvulis percrassis, antice crassiori- 

 bus ; natibus prominentibus, tumidis, incurvis, terminalibus, ad apices parum 

 granulatis ; epidermide vel luteo vel luteo-fusca, micante, eradiata ; dentibus 

 cardinalibus erectis, compressis et crenulatis; lateralibus praelongis, lamellatis 

 subcurvisque ; margarita argentea et valde iridescente. 



Hab. River Tigris at Bagdad. C. M. Wheatley. 



Unio rasus. Testa laevi, lata, inflata, valde inaequilaterali ; valvulis crassis, 

 antice crassioribus; natibus prominentibus, ad apices parum undulatis ; epi- 

 dermide rasa, dilute straminea, eradiata ; dentibus cardinalibus compressis, 

 corrugatis, crenulatis, in utroque valvulo duplicibus ; lateralibus praelongis, 

 corrugatis subrectisque ; margarita, argentea et parum iridescente. 



Hab. Assyria. C. M. Wheatley. 



Unio Syriacus. Testa sulcata, subelliptica, inflata, valde inaequilaterali ; 

 valvulis subtenuibus, antice incrassatis ; natibus prominentibus, tumidis ; 

 epidermide tenebroso-olivacea, eradiata ; dentibus cardinalibus parvis, 

 acuminatis, subcompressis, in utroque valvulo duplicibus ; lateralibus parvius- 

 culis, lamellatis subcurvisque ; margarita albida et iridescente. 



Hab. River Orontes, Syria. C. M. Wheatley. 



1863.] 



