450 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Caranx crysos, Yellow Crevalle. 
FOOD. 
Aug. 28, 1900; 13 young examined. Shrimps very abundant in alimentary canal. 
CESTODES. 
1. Rhynchobothrium. Cysts, peritoneum. 4, p. 794, pi. lxii, figs. 13-15. 
Vomer setipinnis, Dollar-fish. 
Examined only on one occasion, August 5, 1887. No entozoa found. 
Pomatomus saltatrix, Blue-fish. 
FOOD. 
Stomachs of adult with fish (hake, herring, scup, cunner) and squid. Smaller individuals had 
in their alimentary canals small fish, as a rule, but shrimp and amphipods were also found. 
ACANTHOCEPHALA. 
1. Echinorhynckus proteus Westrumb. i, pp. 496-497, pi. vi, figs. 3-5. 3, pp. 537-538, pi. lx, figs. 
85-88. Aug. 15, 1899; July 21, 23, 1900; Aug. 13, 1900. In intestine, usually with the head 
perforating the intestinal walls. 
2. Echinorhynchus incrcissatus Molin. Peritoneum. 3, pp. 533-534, pi. lviii, figs. 54-69a. 
3. Echinorhynchus mgittifer Linton. Peritoneum. I, pp. 493-496, pi. vi, figs. 1, 2. 3, pp. 535-536. 
NEMATODES. 
4. Immature nematodes. Encapsuled on viscera. 7 , p. 278. Aug. 15, 1899; July 21, 23, 1900; Aug. 13, 
1900. [PI. x, figs. 100-106.] 
Found also on many occasions in previous years encapsuled on the viscera. A common form is 
identical with that from the squeteague (fig. 107); length of one, 10.5 mm. Another common form 
is larger (18 mm. to 28 mm.). In the larger specimens the characteristic head of Ascaris maybe made 
out through the investing membrane. The posterior end in this form is bluntly rounded with a sharp 
mucronate tip. A small specimen, 9 mm. in length, differed from the foregoing by having the postanal 
region' roughened as shown in fig. 120, from Slenotomus. 
One lot from the outer coats of the stomach, collected by S. E. Meek, Fulton Market, New York, 
October, 1886, represent a more advanced stage of development than the foregoing. (See figs. 100-104. ) 
The body is thickest anteriorly and is covered with a thin embryonic investment. The large intestine 
ends abruptly in a short and comparatively narrow rectum, with a top-shaped anal gland on the left 
side and another on the dorsal side, both near the termination of the intestine proper (fig. 104). 
Dimensions of one in millimeters: Length, 20; diameter of head 0,14, 2 mm. back of head 0.34 
maximum 0.34, 2 mm. from posterior end 0.24, at anal aperture 0.16; distance of anal aperture from 
posterior end, 0.26; length of oesophagus, 2.6. 
5. Ichthyonema c/lobiceps Rudolphi. Ovaries. [PI. xvm, figs. 211-215.] August, 1884. 
Dimensions of alcoholic specimen in millimeters: Length, 150; diameter of globular" anterior 
extremity of oesophagus 0.15, of oesophagus behind anterior end from 0.07 to 0.09, of intestine near 
oesophagus 0.04; length of oesophagus, 1; diameter of body (maximum), 1; diameter one-half milli- 
meter from posterior end, 0.5; length of embryos from 0.2 to 0.36; greatest diameter of embryos 
0.014. The color of the alcoholic specimen is yellowish white, with the intestine showing as a 
relatively broad, dark-brown stripe. The intestinal walls have an abundant deposit of pigment and 
are traversed by transparent anastomosing lines, which produce an effect which resembles the venation 
of a leaf. The embryos, which are in myriads, appear to have escaped into the body cavity by rupture 
of the uterus. They are blunt at one end and exceedingly slender, even flagellate, at the other. 
