184 [June, 1842. 



MEETING FOR BUSINESS, June 28th, 1842. 



Vice President Morton in the Chair. 



The committee, consisting of Mr. Phillips, Dr. Goddard, and 

 Dr. Morton, to whom were referred the following communica- 

 tions of Mr. Haldeman, reported in favour of publication in the 

 Proceedings. 



Description of two species of Entomostraca and two Hy- 

 drachnae, by S. S. Haldeman. 



Daphnia abrupta. Body short, irregular in outline, back but slightly convex, 

 meeting the head at a slight depression, and the posterior extremity with a curve 

 of a quarter of a circle ; posterior margin running downwards and forwards, with 

 a rounded projection opposite the head ; ventral margin very convex. Colour, 

 brown ; length, 2 millim. Hab. Ditches along the Susquehanna. 



LiMNADrA coriacea. Body lengthened; swimming branchiae extending along 

 three-fourths of the inferior surface, from the neck to the extremity of the tail; 

 tail crested above with a row of large conical obtuse tubercles ; apex of the shell 

 elevated, and about one-fourth of the length from the anterior extremity ; colour, 

 light brown; length 5 millim., height 3, diam. 1^. Hab. Ditches along the Sus- 

 quehanna, in quiet water. 



Obs. The shell is coriaceous and translucent, and bears a slight resemblance 

 to Mesodesma Jauresii. It is not a little singular that the same generic and spe- 

 cific name, Limnadia gigas, should have been applied both to a crustacean and 

 a mollusc, each of which has a bivalve shell, andinhabits fresh water. 



Hydrachna scabra. Subglobose, dull vermillion red, displaying a rough papil- 

 lated surface under the microscope ; legs ciliated, some of the bristles extremely 

 long; claws simple, retractile ; length 1| millim. Hab. Quiet waters along the 

 Susquehanna. Swims well, and occasionally leaves the water for the damp earth. 



Hydrachna bundata. Subglobular, light ochraceous, clouded with light yellowish 

 brown ; there are five blood-red spots, placed respectively between the eyes, at the 

 posterior extremity, upon the margin of each side, and in the middle of the body; 

 legs long, slender, and ciliated. Length 1 millim. Extremely active, swimming 

 through the water with great rapidity. Occurs with the preceding species. 



Description of a new species of Cypris. By S. S. Halde- 

 man. 



Cypris scabra. Shell modioliform, rough, inflated, thickly covered with bristles ; 

 colour (of the dead shell,) pale livid, or corneus. Length 1 1, height 1 millimetre. 

 Hab. A small pond near Cambridge, Mass. It resembles Modiola nexa some- 

 what, in outline. 



The committee on Dr. Zantzinger's paper, containing a 

 Tabular Statement of Meteorological observations for the year 



