NATURAL SCIENCES OF PHILADELPHIA. 
Ill 
small, followed by a smaller pharyngeal bulb. Intestine simple, traceable 
on each side to the posterior end of the body. Testes four, posterior to the 
position of the distended oviducts. Ovaries finely lobulated, situated on each 
side external to the position of the intestine ; oviduct transversely tortuous 
and distended with brown ova. Penis ensheathed, long, tortuous, echinate. 
Generative aperture small, acetabuliform. Ova oval and prolonged at OBe 
pole, or sub-pyriform. Length of body 6^ lines ; breadth 1 line. 
Four specimens were obtained by Dr. J. M. Corse from the bile ducts and 
gall-bladder of the musk-rat {Fiber zibethicus.) Closely allied to M. hippo- 
crepis, Diesing, but has no trace of the horse-shoe-like collar to the head. 
MoNOSTOMUM SPATULATUM, Leidy. 
Body flat, oblong ovate, narrowing anteriorly, obtuse posteriorly ; color 
white, with brown tortuous lines indicating the course of the oviduct. Mouth 
acetabuliform, circular. Testes three,' alternating on each side posteriorly 
with the oviduct. Ovaries on each side finely lobulated. Grenerative aperture 
small, a short distance behind the mouth. Penis undistinguishable. Length 
3 to 4 lines ; breadth ^ line. 
Twenty-three specimens were obtained, by Prof. Jefi"ries Wyman, from^ the 
gall-bladder of a fish, the species of which has been forgotten. 
DiSTOMUM BiLiosuM, Leidy. 
Body ovoid, anteriorly compressed conical and incurved, posteriorly robust 
and obtuse. Mouth subterminal transversely semicircular or crescentic. 
Acetabulum much larger than the mouth, sessile, subcircular, with a large 
transversely elliptical and bi-polar aperture. Generative aperture a little in 
advance and to the left of the acetabulum, and provided with a prominent 
circular lip. Length from 1 to 2^ lines ; breadth |- to 1 line ; thickness | to | 
line. 
Several hundred specimens were obtained from the gall bladder of a fish, 
by Prof. Wyman, but the species has likewise been forgotten. 
Tetrabothrium barbatum, Leidy. 
Body delicate, filiform, quadrilateral, anteriorly narrowing, and then slightly 
widening again towards the head, posteriorly three or four times the breadth 
of the thickness ; anterior segments quadrate, with the posterior angles pro- 
jecting into barb- like lobes ; posterior segments transversely oblong quadrate, 
with the posterior margin on each side projecting into a festoon-like lobe. 
Neck none, or a mere constriction. Head larger than the commencement of 
the body, conical. Bothria four, oblique, marginal, subcircular, large, forni- 
cate, and folded at the border. Mouth at the summit of a globular papilla, 
unarmed. Length from 1 to 5 inches ; breadth anteriorly l-5th line, pos- 
teriorly I line. 
Numerous individuals were obtained from the intestine of a large Odontaspla 
punctata ? caught on the coast of New Jersey. 
DiBOTHHRiuM sPBCiosuM, Leidy. 
Head gradually narrowing to its extremity which is funnel-shaped and 
truncated. Bothria two, long, marginal, as wide as the head. Neck none- 
Anterior articuli short, subcuneate, those succeeding transversely sub-reniform, 
those posterior more equally quadrate, with convex margins, except the back 
one which is emarginate. Length 1^ inches ; breadth anteriorly 1-lOth line, 
posteriorly 2-5th line. Head ^ line long, 1-lOth line wide, Generative aper- 
tures lateral. 
Obtained by Mr. Noah Kollar from the intestine of Boleosoma Olmstedi. 
ACANTHORHTNCHUS RBPTANS, Diesiug. 
Obtained from the Drum fish, Pogonias chromis. Smallest individuals, from 
i to 1 inch long by | line broad, were contained in cysts, adhering to the 
intestines, in the peritoneal cavity. One 3 inches long, with the head 2 
lines long, was found in the liver. The largest ones were coiled up in oval 
masses, imbedded among the muscles of the tail. Two masses measured each 
about 3 inches long by 10 lines in diameter. The worm was several feet in 
1858.] 
