PARASITES OF FISHES OF THE WOODS HOLE REGION. 
459 
spermatozoa, which were in active motion. Small masses of yolk, smaller than the germ cell, were 
also seen entering the mold. The distome noted in 7 , p. 296, pi. xxxix, lig. 72, is a closely related 
form. See also No. 3 under Lagocephalus lievigatus. 
12. Distomum appendicidatum Rudolphi. 7 , p. 289, pi. xxxvi, tigs. 25, 26. One specimen found in 
this host Aug. 9, 1899. 
13. Globular cysts in kidneys. 7 , pp. 280, 301. These are probably due to psorosperms. 
RHYNCHOBDELLIDA. 
14. Pontobdella rapax Verrill. 7 , p. 280. See under JParaUchthys dental ns, No. 23. 
Arehosargus proba.tocephalus, Sheepshead. 
ACANTHOCEPHALA. 
1. Echinorhynchus proteus Westrumb. 
Several specimens enveloped in connective tissue cysts from peritoneum of a fish from Chesapeake 
Bay. Collected by S. E. Meek, Fulton Market, New York, August 30, 1886. Several of the cysts 
contained degenerate connective tissue of a waxy consistency. The specimens were adult, the females 
containing the fusiform embryos characteristic of the species. One of the longer specimens measured 
10.5 mm. in length. 
Cynoscion regalis, Squeteague, Weak-fish. 
• FOOD. 
Only large specimens were examined. The food is fish and squids; shrimps and amphipods 
found in a few cases. From the stomach of a specimen of average size, about 18 inches in length, 
examined .July 31, 1900, there were taken two menhaden, each 9 inches long, one butter-fish, 41 inches 
long, and one squid, 7 inches in length. A specimen examined on August 1, length 20 inches, had a 
menhaden 11. inches long in its stomach. 
ACANTHOCEPHALA. 
1. Echinorhynchus sagittifer Inn ton. On viscera. I, pp. 493-496, pi. vi, figs. 1, 2. 3, pp. 535-536, pi. 
lix, fig. 80. 
2. Echinorhynchus proteus Westrumb. Intestine. 1, pp. 496-497, pi. vi, figs. 3-5. 3, pp. 537-538, pi. 
lx, figs. 85-88. 7 , pp. 280-281. 
Found three times in 1899 and twice in 1900. Heads perforating intestinal walls as in Eoccus 
lineatus. [PI. ii, figs. 12, 13.] 
3. Echinorhynchus pristis Rudolphi. 3, pp. 530-531, pi. lvi, figs. 31-38. 
One found on viscera July 25, 1900. While the worm was living it was observed everting and 
inverting both the proboscis and the anterior end of the body. These movements were rapid, especially 
those of the proboscis. 
NEMATODES. 
4. Immature nematodes. [PI. x, figs. 107-109.] 7 , pp. 280-281. 
On many occasions and in different summers 1 have found immature nematodes encapsuled in 
the mesentery and on the viscera. They were found in practically all the squeteague (92) examined 
in the summers of 1899 and 1900. These agree in the main with those found in the blue-fish, scup, and 
others. The largest specimens measured 17 mm. in length. A rudimentary three-lobed structure of the 
head could be made out in some by examination under pressure in acetic acid. A diverticulum of 
the intestine near the base of the oesophagus was observed in several of the specimens. Dimensions 
of specimen figured in millimeters: Length, 10; diameter, 1 mm. from anterior end 0.24, 1 mm. from 
posterior end 0.22, maximum (at anterior fourth) 0.3, at anal aperture 0.08; distance of anal aperture 
from posterior end, 0.12. Length of oesophagus, in a specimen 14 mm. in length, 3 mm. 
CESTODES. 
5. Larval cestodes ( Scolex polymorphus Dujardin). Free in gall bladder and cystic duct. I , pp. 453-454, 
pi. vi, figs. 6-9. 4, pp. 789-792, pi. lxi, figs. 4-15. 7, pp. 280-281. 
Found almost invariably in fish examined in 1899 and 1900; also free in intestine of squeteague. 
These are always smaller than those from the cystic duct. 
