336 [April, 



siderably longer than the body, with a brush of hair at the tip. Head broad, 

 much pointed. 



Color. Above mixed brown and yellowish brown ; paler on the sides ; the 

 outside of the foreleg colored to near the wrist. Feet and under parts white. 

 Head and body 3 4-l2ths inches. Tail to end of vertebras 3 9^-l2ths inches; of 

 hairs 4 inches. Hind foot 10 lines. 



Collected on the middle fork of the American River, California, by Dr. C. 

 C. Boyle. Lieut. R. S. Williamson. 



Hesperomys austerus, Baird. Smaller than H. leucopus. Tail as long as the 

 body. Hind feet long. Color above brownish lead color, feet and under parts 

 white. The dusky color of the sides extends on the outside of the forearm to 

 the wrist. Head and body 2 ll-12ths inches. Tail to end of vertebrae2 10-I2ths 

 inches ; of hairs 3 inches. Hind foot from heel 9 lines. 



Collected at Fort Steilacoom, Puget Sound, by Dr. Geo. Suckley, U. S. A., 

 and by Dr. Cooper on the Spokan Plains. Gov. 1. I. Stevens. 



The Committee on Mr. Durand's paper, entitled, "Plantae PrattenianiiEe 

 Californicse," reported in favor of publication in the Journal of the 

 Academy. 



On leave granted, Mr. Vaux presented for publication in the Pro- 

 ceedings, a paper by Mr. William R. Blake, Geologist of the U. S. 

 Pacific R. R. Survey in California, entitled, " Notice of remarkable strata 

 of the remains of Infusoria and Polythalamia,in the Tertiary formations 

 of Monterey, California." Referred to Dr. Leidy, Mr. Isaac Lea, and 

 Mr. Vaux. 



On leave granted, Mr. Cassin presented for publication in the Pro- 

 ceedings, two papers by Prof. S. F. Baird, viz : " Characteristics of some 

 new species of North American Mammalia, collected chiefly during the 

 U. S. Surveys of a Pacific R. R. route to the Pacific, part 1 j" and 

 " Characteristics of some new species of North American Mammalia, 

 collected by the U. S. and Mexican Boundary Survey, under Major 

 Win, H. Emory, U. S. A.;" both of which were referred to a Com- 

 mittee consisting of Mr. Cassin, Dr. Le Conte, and Col. Mc. Call. 



Dr. Rand offered a resolution, which was adopted, appointing a Com- 

 mittee to receive the members of the American Medical Association, 

 which convenes in this city on Tuesday, May 1st. The folio wing were 

 appointed the Committee : Dr. Rand, Mr. Cassin, Dr. Leidy, Dr. J. A. 

 Meigs, Dr. Hallowell, and Dr. Le Conte. 



On motion of Dr. Le Conte, the Curators were added to the committee. 



Dr. Le Conte offered the following Preamble and Resolutions, which 

 were unanimously adopted : 



Whereas, Mr. George Ord, President of the Academy of Natural 

 Sciences of Philadelphia, is about to visit Europe, and has most kindly 

 offered his valuable services to the Society : 



Resolved, That the Academy views with pleasure the opportunity thus 

 afforded of enlarging its friendly relations with similar European In- 

 stitutions. 



Resolved, That the President of the Academy be requested to invite 

 the attention of individuals and Societies, devoted to scientific pursuits, 

 with which he may communicate, to the benefits which would result to 



