90 PROCEEDINGS OF THE ACADEMY OF 
original condition. For mending, it had the advantage over most cements that 
no time was lost in allowing certain parts to dry, which had been united, before 
others could be added. 
Dr. Hays announced the death of Prof. John K. Mitchell; M. D., 
late a member of the Academy. 
April l?t7i. 
Mr. Jeanes in the Chair. 
Fifty-one members present. 
A letter was read from Henry Hartshorne, M. D., Recorder of the 
Biological Department of the Academy, announcing its organization, 
and the selection of the first and third Mondays of each month as the 
time of meeting. 
Dr. Leidy called the attention of the members to a drawing of a curious 
worm, which he said was obtained from the Schuylkill river, and was inter- 
esting from its being more nearly allied to marine forms than any other known 
fresh water species. It lives in tubes of mud ; and is about a line in length. 
The body is divided into twelve annuli, including the head, which is cup- 
shaped, has two eyes, and supports on each side a process provided with 
seventeen cylindrical ciliated arms. The rings, except the head, are provided 
with four rows of bristles and two rows of podal hooks. The bristles are from 
four to six in a bunch ; those anteriorly having a falcate extremity, and those 
posteriorly being whip-like. The anterior hooks are in series of five ; and 
have a long handle with a lancet-like extremity. The posterior hooks are 
from fifteen to twenty in a series, and have a long handle with the extremity 
expanded and serrated on one side. It appears to be most nearly allied to the 
marine genus Fahricia. He proposed for it the name Manayunkia speciosa, 
from the Indian name of the river in which it was first discovered. 
April 20th. 
Vice-President Bridges in the Chair. 
Thirty- six members present. 
The following papers were presented for publication in the Proceed- 
ings : 
Prodromus Descriptionis Animalium evertebratorum, &c., observavit 
et descripsit W. Stimpson, Pars. V. Crustacea Ocypodoidea. 
Contributions to Helminthology, by Joseph Leidy, M. D. 
And were referred to Committees. 
Mr. Lea remarked that when, a few evenings since. Dr. Leidy made some ob- 
servations on a few fossil Saurian and Batrachian bones, from the Red Sand- 
stone of Grwynedd, 20 miles north of Philadelphia, and which were collected 
and presented by him and some other members, some observations were made 
by Mr. Lea on the epoch of that mass of red and gray sandstone rocks and 
blackslates. This formation is now assuming greater importance, and the 
interest in it has recently much increased by discoveries made by Major Hawn 
in Kansas Territory ; descriptions of the fossil species, chiefly MoUusca, have 
been made by Messrs. Meek and Hayden and Prof. Swallow. No bones or foot 
prints have been observed by Major Hawn^ but all the specimens of MoUusca, 
&c., indicate without any doubt their belonging to some portion of the Permian 
Formation. 
. [April, 
