PARASITES OF FISHES OF THE WOODS HOLE REGION. 
477 
Antimora viola. 
NEMATODES. 
1. Immature nematodes. [PI. xm, figs. 163-165.] 
Seven specimens from peritoneum; U. S. Fish Commission steamer Albatross, 811 fathoms. These 
specimens, which are young ascarids, have the body covered with a thin embryonic investment, which 
is thrown into transverse folds, raised from the body, and in places sloughing off. In some of the 
specimens rudimentary lips can be seen. Dimensions in millimeters: Length, 28; diameter of head 
0. 12. middle 0.5, at anal aperture 0.15; distance of anal aperture from posterior end, 0.15. 
Phycis tenuis, Hake. 
FOOD. 
The stomachs examined by me have been empty. The intestines of some alcoholic specimens 
contained a whitish chyle, which became chalky when dry and contained a large proportion of 
carbonate of lime. 
NEMATODES. 
1. Ascaris sp. [PI. via, figs. 75-78.] 
One specimen, a female, collected by Vinal N. Edwards, November, 1888, appears to be near A. 
clavata. Some of its dimensions in millimeters are: Length, 84; diameter of head 0.36, 1 mm. back of 
head 0.65, near middle (maximum) 1.85, 1 mm. from posterior end 1.12, at anal aperture 0.72; distance 
from anal aperture to posterior end 0.37; length of upper lip 0.28, breadth 0.26. 
The specimen is attenuate for the anterior third, posterior end coiled; diameter nearly uniform 
from middle to posterior end. The upper lip is unsymmetrical and no papillae were seen on it. No 
lateral alee were observed. 
2. Immature nematodes (Ascaris). From body cavity. [PI. xm, figs. 166, 167.] 
Six lots in the U. S. National Museum collection taken from fish captured off Marthas Vineyard 
in connection with work of the U. S. Fish Commission; one lot collected at Woods Hole, August 
28, 1889. The specimens are for the most part from the, outside of the alimentary canal. The bottles 
contained several stomachs and intestines and a single specimen was found in one of the stomachs. 
This was compared with specimens taken from capsules in the mesentery and found to be identical. 
Dimensions in millimeters: Length, 21; diameter, head 0.10, near head 0.3, middle 0.44, near posterior 
0.3, at anal aperture 0.15; distance anal aperture to posterior end 0.25. The outlines of the young 
ascaris could be made out within the embryonic cuticle. 
3. Filaria serrata sp. nov. [PI. xv, figs. 192-196.] Off Nantucket, 65 fathoms, Aug. 23, 4883. 
Body armed with circles of short triangular spines. First circle about 0. 1 mm. from the anterior 
end, length of spines 0.01 mm. The circles become rather indistinct back of the eighteenth, but 
continue until their number is over 100, as could be seen along the margins of optical sections of the 
worm. The spines become smaller in the posterior circles. Dimensions of male in millimeters: 
Length, 5.8; diameter in front of first circle of spines 0.06, at first circle 0.07, middle 0.1, at anal 
aperture 0.06; distance of anal aperture from posterior end 0.16; lengths of copulatory spines 0.06 and 
0.03. Female (specimens not quite complete) : Length, 6.5; diameter at first circle of spines, 0.08; 
maximum diameter, 0.18; ova, 0.04 and 0.02 mm. in the two principal diameters. In the males the 
oesophagus is sinuous and the anterior end seemed to be inverted. The copulatory spines are unequal, 
one being long, slender, and sharp-pointed; the other shorter, a little broader, appears to be forked at 
the base and blunt at the tip. Six postanal and four preanal papilla: were made out on each side. The 
two posterior papillae on each side are much smaller than the others and were seen in only one of the 
specimens. 
The male is further characterized by having four longitudinal, serrate rows of small plates in 
front of the anal aperture. The length of these rows in one specimen was 0.35 mm. The component 
plates 0.001 mm. in height, of varying length; some measured 0.005 in length. 
C'ESTODES. 
4. Ithynchobothrium . Cysts on viscera. 4 , p. 795. 
