22 PROCEEDINGS OF THE [A-pril, I860. 



handlungen, Zwende Deel, loit platten, 1859. From the Academy. 



Verslagen en Mededeelingen, Vols. 8 and 9, 1858-9. 



Ditto, Literary Department, Vol. 4. 



Jahrboek, 1858. From, the Academy. 



Eealscliule zu Neisse. Neisse, 1859. From Wm. Sharsinood, 

 Fsq., PhiladelpJhia. 



Proceedings of the Boston Society of Natural History, Vol. 7, 

 pp. 193-224. 



Prodromns Descriptionis Animalimn Evertebratorum, &c., pars 

 VIII. W. Stimpson. From the Author. 



Notes on North American Crustacea, No. 1., W. Stimpson. From 

 the Author. 



A letter was read from the Koninglijke Akademie van Weten- 

 schapi:)en, Amsterdam, sohciting exchange. Agreed to. 



Also a letter fi-om the Smithsonian Institution, acknowledging 

 the receipt of Nos. 1 and 2 of the Proceedings of the Society. 



The Leech with ova presented at the last meeting was again ex- 

 hibited by the President, showing the progTess of incubation. 



Prof. McCkady exhibited two living specimens, a male and a female, of a 

 new sj)ecies of Cheirocephalus, foimd in a pond on Charleston neck. He re- 

 marked that it was quite a distinct species from the C. diaphanus of Europe, 

 being scarcely an inch in length, and the male being provided with more sinu- 

 ous, and proportionately larger prehensile antennae, which bore each at its 

 extremity, several blunt spines. The present species had also the eleven pairs 

 of branchial legs more nearly of equal length, not shortest at the mouth and 

 longest at the abdomen as in G. diaplumus. Like the other species, its habitual 

 position in swimming is with the ventral surface uppermost. He prox)osed to 

 name it Cheieocephalus digitatus. 



Prof. McCrady remarked that this and a small species of Cypris found in the 

 the same pond, must be very rapid in their development from the egg, or must 

 be capable, like the Rotatoria, of being partially dessicated without suffering 

 the loss of vitality. The pond in which they were found was only a rain pool 

 formed in the woods near his residence. It had been quite dry for some time 

 past, but, in a day or two after a heavy rain, the water was filled with these 

 EntomostroAia, and in that short space of time, the Cheirocephalns had acquired 

 fully developed sexual organs. 



The President mentioned that he had found a species of Cheiroceplwhis at 

 Stone Mountain, Georgia, in the summer of 1849. 



