THE 
MONTHLY MICROSCOPICAL JOURNAL. 
MAY 1, 1869. 
I. — Notes on Zoosjoerms of Crustacea. 
By Alfred Sanders, M.K.C.S., F.E.M.S. 
(Read before the Koyal Microscopical Society, March 10, 1869). 
The higher Crustacea have the pecuharity, which they share with 
the Arachnida, Myriapoda, and, I beheve, a few other animals, of 
possessing zoosperms distinguishable from those of the remainder 
of the animal kingdom, by not being linear, and, moreover, by not 
having that undulating motion which so puzzled the older students 
of this branch of anatomy. 
On inspecting a zoosperm of this class, it is found to be divi- 
sible into a caput, which seems to correspond to the caput of the 
linear zoosperms, and appendages of various forms; the fact of 
these appendages being motionless appears to confer on them a 
EXPLANATION OF PLATES XI. AND XII. 
Plate XI. 
Fig. 1. — Zoosperms of Carcinus Mcenas, measuring O'OOl""" short diameter, 
0-008""™ long diameter. 
„ 2. — Zoosperms of S. Longirostris. 
a. top view 0*007 
h. side view. 
c. younger zoosperms, O'OOS""™. 
„ 3. — Zoosperms of P. Bernhardus. 
a and b. side view; a is O'OOi broad, 0*006 long. 
c. side view slightly within focus. 
d. top view. 
e. ,, slightly within focus. 
„ 4. — Zoosperms of Lobster. 
a. side view, 0"004"™ broad, 0-012'""" long. 
6. top view, 0-007""". 
„ 5. — Spermatophorum of S. Longirostris. 
„ 6. — „ P. Bernhardus. 
„ 7. — „ P. 3fisanthropicus. 
b. more highly magnified. The head measures O-IS""™ across, 
0-16™™ in length ; stalk about 0-46™™ ; pedestal 0-07«>™. 
„ 8. — Cells from testis of P. Bernhardus. 
a. cells examined immediately after death; larger measure 
0'015™™, smaller 0-013™™, [Fig. 8. 
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