PARASITES OF FISHES OF THE WOODS HOLE REGION. 
447 
CESTODES. 
5. Synbothrium filicolle Linton. Cysts on viscera. 4 , p. 815. 
6. Rhynchobothrium bulbifer Linton. Cysts on viscera. July 21, 1900. See 4 , p. 793. 
7. Rhynchobothrium speciosum Linton. Cysts on viscera. July 30, 1900. See 4 , pp. 801-805. 
TREMATODES. 
8. Gasterostomum sp. Intestine. [PI. xxxiv, figs. 369-372.] July 21 and 30 and Aug. 13, 1900; 12 
hosts in all. 
This is probably a new species near G. arcuatum. Neck and body crossed by fine transverse 
strise, which under high magnification are resolved into transverse rows of exceedingly fine, short, 
bristle-like spines. Dimensions in millimeters: Length, 2.1; diameter, anterior 0.2, maximum diameter, 
at about 1] mm. from anterior end, 0.31; anterior sucker, length 0.14; breadth of acetabulum 0.29, 
length 0.26; ova, 0.017 and 0.014 in the two principal diameters. In one of the specimens there were 
ova of two kinds. The smaller had thick shells with dimensions as given above. These were most 
abundant. In addition to these there were a considerable number of larger oval eggs with thinner 
shells in the uterus just back of the acetabulum. The dimensions of these in life were 0.028 and 0.024 
in the two principal diameters. In the preserved specimens the contrast between these ova is not so 
great as in life. The vitellaria are as in G. arcuatum, viz, 16 on each side in two lateral clusters in front 
of the acetabulum. Two sets of comparatively coarse diagonal fibers crossing each other (fig. 370) 
constitute a conspicuous feature of the body wall in the neck of a stained specimen. 
9. Dislomum ( Kollikeria ) sp. Cysts in intestinal wall. Aug. 13, 1900. [PL xxxiv, fig. 366.] 
Only a few of these cysts were collected, it being supposed from their appearance that they 
contained degenerate connective tissue. All but one consisted of but little more than a mass of small 
ova. Dimensions in millimeters: Longer diameter of reniform mass 1.74, shorter diameter 1.09; 
diameter of neck (?), 0.13; ova, 0.015 and 0.01 in the two principal diameters. Color, yellow and white 
intermingled. 
Scomberomorus cavalla, Cero. 
FOOD. 
Bones of fish, pen and other parts of squid in stomach. Stomach usually empty. 
CESTODES. 
1. Synbothrium filicolle Linton. 4 , p. 818. 
Scomberomorus regalis ( Gybiurn regale), King -fish, Cero. 
FOOD. 
Fragments of small fish in stomach. In most cases the stomach was empty. 
CESTODES. 
All from cysts on viscera. 
1. Rhynchobothrium sp. 8, p. 794. Aug. 18, 1899. 
2. Telrarhynchus sp. 4 , p. 808. 
3. Synbothrium filicolle Linton. 4 , pp. 811-818. Aug. 18, 1899. 
Tetrapterus imperator ( Tetrapterus albidus), Spear-fish. 
NEMATODES. 
1. Ascaris incurva Rudolphi. 
U. S. National Museum collection. Label: “From rectum of Tetrapterus, Penikese, B. G. Wilder; 
August 5.” There are twenty-four specimens in the lot, the largest 88 mm. in length and 3 mm. in 
greatest diameter; diameter of head, 0.4 mm. Nematodes, probably of this species, were obtained 
from the intestine of a spear-fish at Woods Hole, August 8, 1885, and turned over to B. F. Koons, 
Mansfield, Conn. 
CESTODES. 
2. Dibothrium manubriforme Linton. Intestine. 1, pp. 456-458, pi. i, figs. 1-4. 2 , pp. 728-731. 5 , p.429. 
3. Telrarhynchus (?). Cysts on intestine. 4 , p. 809. 
