1002 Proceedings of Scientific Societies.  [Sept., 1883 
animalcules. ae 
3.—Dr. Leidy stated that examination of the plush ex- — 
not by a flattening of tubercles, as may have been the case m- 
animals having lateral motion of the jaws (as the Ungulates). He 
defined about seven series of forms based on the mutations of the - 
tubercles. Professor Lewis read a paper by Miss Foulke upon + 
rotifer presumed to be new. : Re 
ay 10.—Mr. J. Wilcox gave some interesting particulars | 
respecting the surface soils of Canada, which are. thin and pooh 
while water is scarce. He believed that the Laurentian fi 
were once covered by sedimentary strata, since removed by 
sion. The same speaker gave an account of the altered habits 
the sheepshead and some other fishes in Florida. 2 fie 
fresh-water streams and feed on Conferva and other vege” 
food. Professor Lewis read for Miss. Foulke a description 
a new species of rotifer, named by her Floscularia on 
May 17.—Dr. Clevenger, of Chicago, gave the pager 
researches upon the valves in the vascular system. Ina ied 
ped the horizontal veins of the trunk had no valves, while m 
vertical ones, those of the limbs and intercostal spaces, are 
nished with them. In man precisely the same arrangemem™ 
vails, although the horizontal veins have become vertical an 
vertical ones horizontal. He also alluded to the tendon’ 
hernia produced by the want of strength in ligaments W 
