242 [ FEBRUARY, 
Rev. M. J. Berkeley, F. I. S., and the Rev. M. A. Curtis, «‘On the 
Kxotie Fungi from the Schweinitzian Herbarium in the Acad. Nat. Sci. 
of Philadelphia,” was presented and referred to Dr. Zantzinger, Mr. 
Ki. Durand and Dr. Bridges. 
Mr. Cassin exhibited the specimen of Scalops, described by him, 
under the name of Scalops metallescens, in the paper presented this 
evening. This specimen was collected in Oregon by the Naturalists 
attached to the Exploring Expedition under the command of Capt. 
Wilkes, U.S. N., and is one of the most remarkable species of the 
family to which it belongs. 
February 22d. 
Vice President BRIDGES in the Chair. 
The Committee to which was referred the following paper by Dr. 
Woodhouse, reported in favor of, publication in the Proceedings : 
Description of a new species of Mouse, of the genus Hesperomys, Waterhouse. 
By 8S. W. Woopnousz, M. D. 
HesPperomys TEXxANA. 
Char. Essent.—Smaller than the H. leucopus, head shorter and more blunt, 
ears smaller and more round, brown above, and white, inclining to yellowish, 
beneath. 
Description.—Head large, blunt. Eyes prominent, and dark brown. Ears 
large, erect, roundish, oval, blunt, sparsely covered outwardly with short ap- 
pressed brown hairs, inwardly with grey. Thumb of fore feet a tubercle, fur- 
nished with a long blunt nail, two middle toes the longest, subequal. Hind feet 
furred, with the exception of the sole. Whiskers long. 
Color.—Hair dark cinereous, above tipped with pale brown, and dusky, so as 
to have rather a mottled appearance ; beneath white inclining to yellowish; the 
two colors, that is to say above and beneath, tolerably distinctly separated 
from each other in a straight line. Tail above brown, beneath white; nose 
mixed brown and grey, or pale brown. Whiskers black and grey; legs white on 
their inner surface only, feet white, the hairs projecting over the nails. 
Habitat.—Western Texas. 
Dimensions. 
Total length from tip of nose to root of tail, 2 1-10 inches 
“6 oof tail, FAM POMS ATT len Oye wares 
<é ‘¢ of head, . 4 ‘ és : 11-10 « 
Height of ear, 5 5 5 6 : : 4.10 « 
Breadth of ear, 5 : : 3 A A SaLOE 6 
Fore legs, 4 : : : : : : ‘ 1 ee 
Hind legs, : d ; : : : ° : 16-10... 6 
Observations.—I procured this little animal on the Rio Grande near El Paso, 
whilst attached to the party under the command of Captain L. Sitgreaves, U.S. 
Topographical Engineers, on our way to explore the Zuni and Colorado rivers. 
Of its habits I know nothing. My attention was called to this animal by Major 
Le Conte, who has been for some time engaged in the study of the mice of our 
country. 
The Committee on Mr. Conrad’s ‘Synopsis of the North American 
Naiades,” reported in favor of publication in the Proceedings : 
