PARASITES OF FISHES OF THE WOODS HOLE REGION 
467 
NEMATODES. 
2. Immature nematodes (Ascaris). 7 , p. 282. 
Two lots of these specimens, collected by Yinal N. Edwards November 5, 1886, and October 24, 
1887, are in the U. S. National Museum collection. They are of nearly uniform diameter, but taper a 
little more anteriorly than posteriorly; the largest are 22 mm. in length and 0.5 mm. in greatest 
diameter. They agree with immature ascarids from Prionotus carolinus. 
2a. Ascaris sp. [PI. vrir, figs. 70-72.] 
Specimen, a female, collected by S. E. Meek, Fulton Market, New York, October 28, 1886. 
Dimensions in millimeters: Length, 50; diameter, head 0.26, maximum (posterior third) 1.75, 1 mm. 
from head 0.26, 1 mm. from posterior end 0.9, at anal aperture 0.32; distance of anal aperture from 
posterior end, 0.4. 
CESTODES. 
3. A larval cestode, probably Dibothrium sp. On viscera. 
Small, somewhat flask-shape, with pore at anterior end. July 27, 1900. 
4. Rhynchobothrium sp. Cysts in muscles. 4 , p. 798. 
TKEMATODES. 
5. Distoinum appendicidatum Intestine. July 27, 1900. See 7 , p. 289, pi. xxxvi, figs. 25, 26. 
Dimensions in millimeters (alcoholic specimens) : Length, 2.10; diameter oral sucker 0.065, of 
acetabulum 0.148; ova, 0.024 and 0.010 in the principal diameters. 
Cottunculus thomsonii. 
NEMATODES. 
1. Ascaris sp. [PI. ix, figs. 84-87.] 
Fourteen specimens from stomach of fish taken by steamer Albatross, stat'on2739, 1887; depth, 811 
fathoms. Body thickened posteriorly, attenuate anteriorly, most rapidly for first 5 mm., crossed by 
minute transverse strife, which are 0.025 mm. apart. Length of lips about equaling diameter of head; 
lateral lips each with a single papilla near front edge; anterolateral edges prominent and rounded; 
lateral membrane of lip narrow; triangular interlip large; lips unsymmetrical. Posterior end of body 
curved in males, straight in females. The largest specimen measured 97 mm. in length and 1.5 mm. 
in diameter. Dimensions of another specimen, a female, in millimeters: Length, 84; diameter of head 
0.2, near middle 1.25, 10 mm. from posterior end 1.3, at anal aperture 0.5; length of lips, 0.2; distance 
of anal aperture from posterior end, 0.8 The larger males nearly equal the larger females. Two 
postanal papillae were made out in side view of larger specimens. In a smaller specimen, 28 mm. in 
length, 3 postanal on each side and 17 preanal on one side and 19 on the other were seen. These were 
arranged in a single row on each side. Spines slender and sharp-pointed; length, 2 mm.; diameter, 
0. 02 mm. 
Hemitripterus americanus, Sea Raven, Red Sculpin. 
NEMATODES. 
1. Ascaris sp. [PI. lx, figs. 91-94, and pi. xiii, figs. 157-159.] 
U. S. National Museum collection; collected by Vinal N. Edwards, November 5, 1886. These 
worms are of nearly uniform diameter throughout, a little thickened posteriorly, the tail recurved. 
Narrow alse were observed near the head of one, a female; body smooth. A male, 40 mm. in length, 
diameter of head 0.23 mm. and of body 0.7 mm., and length of spines about 0.3 mm., had about twenty 
preanal papillse on one side. These appeared to lie in a single row, the posterior ones being close 
together and small, the anterior ones more sparsely distributed and larger; postanal region short. 
Another lot, collected also by Mr. Edwards, October 12, 1887, appear to be immature females of 
the same species. The embryonic cuticle was still adherent to the posterior end of one. The alse 
back of the head were more distinct and the postanal region rather more elongated. Dimensions in 
millimeters: Length, 20; diameter of head 0.25, middle 0.6, at anal aperture 0.23; distance anal 
aperture from posterior tip, 0.34. 
