PARASITES OF FISHES OF THE WOODS HOLE REGION. 
441 
posterior end 0.069; ova, 0.021 and 0.010 in the two principal diameters. The entire body is covered 
with spines; those on the neck are sharp-pointed and triangular; on the body they are smaller and 
more slender; at the posterior end of the body they are minute. The cirrus is armed with comparatively 
coarse spines; cirrus pouch elongate. Vitellaria in mounted specimens appear to be two subglobular 
masses of coarsely polygonal granules, lying dorsal and a little posterior to the acetabulum; testes and 
ovary not distinctly shown in the specimens, but evidently all near the vitellaria. 
Salmo salar, Salmon. 
NEMATODES. 
1. Immature nematodes ( Ascaris ). [PI. xi, fig. 131.] 
U. S. National Museum collection; Bucksport, Me., Mr. Atkins, collector. Two nematodes, 
evidently from capsules. Head with three lobes, body narrowing uniformly but slightly to each end; 
tail with a minute mucronate tip. Dimensions in millimeters: Length, 20; diameter, maximum 0.4, 
at anal aperture 0.14; distance of anal aperture from posterior end, 0.13; length of the other speci- 
men, 24; diameter, 0.5. Fig. 90, sketched from a specimen from Muslelus, would also answer for these 
forms. 
Salvelinus fontinalis, Brook Trout. 
NEMATODES. 
1 . Cucullanus elegans Zeder. 
IT. S. National Museum collection; 5 collected by Dr. Robert F. Morris; locality not given. 
Female — length, 18 mm.; diameter, 0.45 mm. Male — length, 15 mm.; diameter, 0.25 mm. Ova, 
oblong-elliptical, 0.04 mm. and 0.02 mm. in the two principal diameters. A characteristic feature of 
these worms was the strongly marked longitudinal striations. 
Osmerus mordax, Smelt. 
NEMATODES. 
1. Ascaris sp. Immature. 
U. S. National Museum collection; 3 collected February 2, 1882; locality not given. Head with 
three rudimentary lobes; tail minutely mucronate. Dimensions of one of the largest in millimeters: 
Length, 41; diameter of head 0.3, middle 0.9, at anal aperture 0.23; distance of anal aperture from 
anterior end, 0.18. Fig. 90, from Mustelus, and fig. 131, from Salmo, will also answer for these forms. 
C'ESTODES. 
2. Dibothrium ligula Donnadieu. 5, p. 438. 
Fundulus heteroclitus, Mummicliog. 
FOOD. 
The following fish from Waquoit Bay were examined in 1899: August 7; 26. Alimentary canals 
filled with green mud, consisting of a variety of vegetable debris, enormous numbers of diatoms, and 
foraminifers in considerable number. August 28; 22. Alimentary canals filled with vegetable material 
(eelgrass, etc. ). A specimen from Katama Bay, August 28, 1900, had shrimp and other small crustaceans 
in the alimentary tract. 
NEMATODES. 
1. Cucullanus sp. [PI. xvii, figs. 207, 208.] Aug. 28, 1899; a few small adults from intestine. 
Measurements in millimeters: Length of male, 3.6 (alcoholic), female 4.8 (life), latter with ova 
segmenting in uterus near genital opening. Dimensions of female, life: Length, 4.8; diameter, anterior 
0.11, middle 0.17, posterior at anal aperture 0.09; length of oesophagus, 0.56; diameter of oesophagus, 
anterior0.ll, middle 0.07, near posterior 0.12, narrowing to 0.07 ; distance from anterior end to nerve 
ring, 0.21; distance of anal aperture from posterior end, 0.19; ova, 0.075 and 0.048 in the two principal 
diameters. Reproductive aperture 2 mm. from posterior end. 
2. Immature nematodes {Ascaris) . Aug. 7, 1899; few. 
