858 General Notes. 
Dr. Lea, in a paper read before the American Philosophical 
Society in early November, 1827, described both the shell and 
soft parts of Unio irroratus, a species then first made known 1 
his paper was published, with figures, in vol. iii., Transactions 
American Philosophical Society, Plate W, 
1827. The general physiological char 
acter of the ctenidium, as thus peculiary — 
interpreted and to have been regard 
as an appendage of the branchiæ, and 
hence as being morphologically distinct | 
He thus writes, pages 270-27 1, loc, h.: , 
> “In those I observed an appendage, m i 
mouth; 4, great anterior mus. form of a depressed cone, attached to : 
cle; c, superior right branchie; the branchiz on either side, and a vey | 
posterior muscle; ein- slight examination fully per ; 
3 Serine right branchize ; right f 
oviduct; g, foot.” Ang these were the oviducts. . . - 
Spermaries—is well known. The terms oviduct, as used by pa 4 
> Lea, and Ovaries, as commonly applied to the surcharged 1 
vr therefore, not only incorrect but misleading. 
Hitherto the peculiar feature noticed in Unto irroratus 
y other species in the genus, 
. pe 
are recurved and thrown outwards. This recurving give 
hither the appearance which Mr. Lea described 4 
tremity. Their w 
ruptured, are furt 
