PARASITES OF FISHES OF THE WOODS HOLE REGION. 
455 
Dimensions of specimen sketched (fig. 353), life, in millimeters: Length, 1.46; diameter, anterior 
0. 1, middle 0.27, of oral sucker 0.07, of ventral sucker 0.07; ova, 0.075 and 0.058 in the two principal 
diameters. See also figs. 341-346, 352, 354. 
PROTOZOA. 
12. Sporocyst. 
From liver: White, globular, 1.5 mm. in diameter. When compressed it liberated immense 
numbers of spores, which were in large part, aggregated into globular or oblong clusters, the larger 
as much as 0.02 mm. in diameter. The spores were short and thick, with bluntly rounded ends; 
length about 0.0025 nun., and a little less than that in breadth and thickness. Collected September 
1, 1900. Specimen given to Dr. IT. H. Cushing. 
Roccus lineatus. Striped Bass. 
FOOD. 
The stomachs of all the specimens which I have examined have been empty. A few fish scales 
have been noted in the intestine. 
ACANTHOCEPHALA. 
1. Echinorliynchus proteus Westrumb. 1 , pp. 496-497, pi. vi, figs. 3-5. 8, pp. 537-538, pi. lxviii, 
figs. 85-88. July 14, 1900; 2 fish examined, 20 in one, 6 in the other. Two obtained from 
another July 21. 
This parasite is apparently with rare exceptions always present in the rectum of the striped bass. 
Usually the head of the worm perforates the intestinal wall and is often surrounded by a waxy 
secretion, which is covered by the serous coat. 
2. Echinorhynchus acus Rudolphi. I, pp. 492-493, pi. v, figs. 7-13. 3 , pp. 525-528, pi. liii, figs. 1-11, 
and pi. lx, figs. 89, 90. 
NEMATODES. 
3. Ascaris sp. Immature. 
In a striped bass examined August 18, 1887, numerous small capsules were found between the 
mucous and submucous layers of the stomach. These were more or less elongated, some even vermiform, 
and were dark-brown on account of the waxy, degenerate tissue with which they were surrounded. 
These capsules contained nematodes. The head of the one examined was truncate, with indistinct 
papillae. The tail tapers to a smooth, round point, somewhat elongate behind the anal aperture. 
The body is crossed by exceedingly fine striae. The (esophagus is long, with a caeca! appendage at its 
base. These forms resemble those from the squeteague. [Figs. 107-109.] 
4. Filaria rubra, Leidy. 
From flesh. Collected by S. E. Meek, Fulton Market, New York, August 12, 1886, who says that 
the worm was red when living. The specimen is a fragment, the posterior end of a long worm ; linear, 
slightly roughened by transverse wrinkles; length, 60 mm.; diameter, about 1 mm. 
5. Lecanocephalus annulatus Molin. [PL xix, figs. 220-223.] 
One specimen, a male, from peritoneum, August 3, 1889. The specimen was in poor condition 
and but little more than the external characters could be made out. Some of the dimensions in 
millimeters are given: Length, 8; diameter of head 0.19, 1 mm. back of head 0.46, maximum (about 
middle) 0.61; length of copulatory spines, about 0.11; distance between the transverse dentigerous 
rows, about middle of body, 0.03. 
CESTODES. 
6. Rhynchobotlirium speciosum Linton. See 4 , pp. 801-805, pi. liv, figs. 13, 14, and pi. lxv, figs. 1-7. 
July 21, 1900. Elongated cyst on viscera. 
TREMATODES. 
7. Distomum tornatum Rudolphi. Intestine. [D. rufoviride Rudolphi.] <», pp.. 515-517, pi. xlii, fig. 
14, and pL xliii, figs. 1-4. 
These specimens were wrongly identified. They should be referred to D. tornatum. 
8. Distomum tenue Linton. <», pp. 535-536, pi. lit, figs. 2-8. 
