ua Proceedings of Scientific Societies. [Jan., 1885. 
belonging to Tenta favopunctata, a species observed but once be- 
fore, when it was described by Professor Weinland. It is probably 
more common than might be supposed ; its small size (fifteen 
inches or so in length) may have caused it to pass unnoticed, or — 
it may have been confounded with other species, 
May 16.—Dr. McCook gave the details of the mode in which 
Lycosa riparia forms its egg-ball; the spider (one kept in captiv- 
ity) made an excavation and covered it with a thin sheet of silk; 
on the wall of her cave she then spun a cushion of white plush 
about three-fourths of an inch in diameter; in about half an hour 
the egg-mass was deposited and covered over with a layer of silk 
similar to that of which the cushion was composed; soon after 
the cushion had disappeared, and the round ball was dangling 
from the end of the spider’s abdomen in the usual manner ; as 
the spider has not excavated since, her evident object was to 
secure seclusion. The same speaker called attention to the dis- 
covery, by Mr. Alan Gentry, of spiders in full health and activity 
beneath the surface of the ice of a frozen pond; when found they were 
passing from point to point on lines stretched between water plants 
at a distance of eight or ten feet from the bank. Dr. Leidy exhibited 
specimens of FPentastomum proboscidium from the lungs of a 
Florida rattlesnake. Mr. Potts announced the discovery of great 
numbers of Cristatella in Harvey’s lake, near Wilkesbarre. 
Specimens six inches long were found. In traveling they did not 
follow the sinuous course usual in the genus. The colonies have 
a persistent non-polypiferous appendage. As a provisional name 
he proposed Cristatella lacustris, 
May 22.—Mr. Willcox stated that shell-mounds abound on the 
west coast of Florida. A portion of the town of Cedar Keys is 
built on such a mound. Human bones, stone implements and 
fragments of pottery are frequently found among the shells, On 
be seen a former place of manufacture of stone implements. 
Professor Heilprin announced that in addition to the foraminifer- 
ous genera previously described (Orbitoides, Nummulites, Oper- 
culina, Heterosteginz, Biloculina, Quinqueloculina) he had found 
Spheroidina in the rock-masses from Florida. He believed that 
none of the genera save Orbitoides had before been found in 
America. He had found a second species of Nummulites, also 
one or two additional forms of Orbitoides, one of which (O. ephip- 
pium) proves beyond doubt the Oligocene age of the deposits. 
Mr. Potts stated that a correspondent in Jamaica had failed to 
find a single fresh-water sponge, He said that in obstructed 
water pipes he could find no traces of sponge, but only clay with 
iron impregnation. The skeleton spicules of Meyenia leidyi un- 
dergoes degeneration in the presence of iron. 
