666 Proceedings of Scientific Societies, (October, 1879. 
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHIL- 
ADELPHIA, March 11.—The following papers were read: On the 
nudibranchiate gastropod Mollusca of the North Pacific ocean, 
by Dr. R. Bergh, and On the variability of Spheria quercuum 
Schw., by J. B Ellis. 
rch 15.—Dr. H. C. Chapman presented a paper for publica- 
tion entitled, Notes on Amphiuma. 
April 25.—Papers entitled, Placenta of A/acacus cynomolgus, 
by H. C. Chapman, and Description of new species of Chiro- 
cephalus, by John A. Ryder, were presented for publication. 
il 22—Mr. Ryder described a new Pauropod from Jair- 
mount Park, which he named Lurypauropus spinosus. 
April 29.—Prof. Cope discussed the ancestry of the Rhinoceros 
family in the light of new material recently obtained from the 
western Tertiary. 
May 6.—Prof. Cope described a new Saurian under the name 
of Camarasaurus leptodcirus. 
May 13.—Dr. Francis Dercum made acommunication on the mu- 
ciferous system of fishes, in which he sought to show their relation 
to the sensory system, as well as some new points in their structure. 
May 20.—Prof. Kcenig made a communication regarding plastic 
clays in reference to their microscopic features. 
ay 27.—Dr. Dercum presented some farther results of his 
study of the muciferous canals. 
June 3d.—Mr. Martindale recorded the fact of the abundance 
of Volvax globator in the hydrant water of Camden, N. J. Prof. 
Cope discussed the geological position of the White river fresh- 
water beds, assigning them to the same position as the Oligocene 
of Europe. He also offered some observations on the genus Ax- 
chitherium, and characterized a new species as A, prestans. 
June 17.—Dr. Leidy exhibited the plates of his new work on 
rhizopods from the report of the Hayden Survey, for the inspection 
of the members, and described a new form under the name of 
Nebela retorta. Prof. Cope exhibited a skull of the new fossil cat, 
Nimravus brachyops. 
June 24.—Mr. Meehan called attention to a remarkable instance 
of variation in the ray-petals of the flower of Lexas, from none a 
all to a form as well-marked as in the ox-eye daisy. Mr. Ryder 
described the larva of his recently described Eurypauropus. ; 
July 1.—Prof. Cope presented a paper on the genera of cats, 1n 
which a re-arrangement of the species was proposed on the char- 
acters presented by the form of the pupil of the eye and the spe- 
cialization of the dentition. 
July 8.—Dr. Leidy described and named a new fossil foot-track 
from the Pennsylvania anthracite coal shale. Prof. Cope discussed 
the principal characters of the genera of Canidæ, new generic 
| by one species which Prof. Cope believed had the same gonent oS 
ancestry as other domesticated dogs. _ -S 
