166 [April, 1842. 



MEETING FOR BUSINESS, April 26th, 1842. 

 Mr. Phillips in the Chair. 



The Corresponding Secretary's Monthly Report was read 

 and adopted. 



The committee, consisting of Dr. McMurtrie, Mr. Conrad 

 and Dr. Goddard, to whom was referred the following com- 

 munication, reported in favour of publication in Proceed- 

 ings of the Academy. 



Description of two new species of Cypris, and a genus of 

 Sterelmintha presumed to be new. By S. S. Haldeman, 

 Read March 22, 1S42. 



Cypris discolor. Elevated, base nearly straight, equally rounded at both ends: 

 an irregular mottling of blackish immediately behind the eye; a raiher smaller 

 blotch of reddish brown at the anterior extremity, and a large one of the same 

 color at the posterior extremity, occupying about one-fifih of the entire surface. 



Variety. The central spot is sometimes reddish, and the posterior one divided 

 into two. Length 0.5 millim.; heighth compared with the length, as 5 to 7. 

 Hab. : in great abundance, a log-pond at the mouth of the Chicquesalunga, on 

 the Susquehanna. 



Cypris vitrea. Translucent, with a tinge of yellow, elongated, nearly straight 

 both ends nearly alike, but the posterior slope is somewhat flattened : about one 

 third of the heighth and length along the dorsal margin, is stained light green : 

 eye obsolete : length 0.5 millim. Hab. : with the preceding, but is comparatively 

 rare. Rather more slender than C. simplex, Hald. 



Hydrolimax. Body slender, limaciform, parenchymatous, provided with vibrilse 

 (cilia) without tentacles or eyes, a posterior nucous pore ! mouth subterminal, 

 bellshaped when expanded. Lives upon mud at the bottom of quiet water : pro- 

 gression as in Limax. 



Hydr. grisea. Half an inch long, mottled grey above ; colorless below, and 

 upon each side of the anterior extremity, where the grey of the back is suddenly 

 narrowed. Hab. : with the preceding species. Bears a striking resemblance to 

 a large grey Limax (L. togata;, Gould), found in Pennsylvania and Virginia. 



ELECTION. 



Charles Ellet,Jr.,of Philadelphia, was duly elected a mem- 

 ber of the Academy. 



