PARASITES OF PISHES OF THE WOODS HOLE REGION. 
463 
Tautoga onitis, Tautog, Blaclc-fisli. 
FOOD. 
In specimens examined previous to 1899 the stomachs were empty. In the summers of 1899 and 
1900, 24 tautog were examined. In the alimentary canals of the large specimens a great variety of 
crabs and mollusks were found. A specimen taken at Menemsha Bight, August 1, 1899, had its 
alimentary canal filled with fragments of crabs and mollusk shells. Among them were recognized 
Triilia trivilata (many), Purpura lapillus, Lunatia heros, Actrum testudinalis, Mytilus' edulis (many 
fragments ) , Cancer irroratus, Eupaguru-s pollicaris ( many) , Libinia canaliculata. The shells and tests had 
all been more or less crushed and broken. No entozoa were found in the alimentary tract of this fish. 
Indeed, it is difficult to see how any could stay in a fish which lives on such a mechanically anti- 
helminthic diet. In small specimens were found seaweeds, a variety of small Crustacea (amphipods, 
copepods, shrimps, small crabs, etc.), mollusks, both univalve and bivalve, and annelids. 
TREMATODES. 
1. Immature distomes encysted in the skin. 
The entire surface of specimen from Menemsha, mentioned in the food notes given above, was 
thickly peppered with small black pigment patches, in which small cysts could be seen. These pigment 
patches and cysts have a general resemblance to those described from the eunner. [7, pp. 281 , 296, pi. 
xl, figs. 76-81.] These cysts were so abundant in this specimen that it was a difficult matter to find a 
scale which was free from them. Usually there was a cluster, often containing as many as 6 or 8 cysts, 
on each scale. The fins were also thickly beset with them. Even the corneas of the eyes were infested 
with them; 74 were counted on one eye and 81 on the other; 14 and 17, respectively, were over the 
pupils. [PI. xxvm, fig. 318.] The walls of the cysts were transparent, so that the suckers of the 
contained distome could be distinguished through them. 
Chastodipterus faber, Moon-fish. 
This fish is rarely taken in the vicinity of Woods Hole. In October, 1886, I received from Mr. 
S. E. Meek, Fulton Market, New York, a few cysts from the abdominal cavity of a moon-fish from the 
North Carolina coast, from which the following were obtained. 
NEMATODES. 
1. Ichthyonema sp. From abdominal cavity. [PI. xvm, figs. 218, 219.] 
The longest entire specimen measured 217 mm. in-length; of nearly uniform diameter throughout, 
maximum diameter 1.6 mm., diameter near anterior end 0.4 mm., increasing soon to 1 mm. In another, 
a fragment, whose maximum diameter was 1.12 nun., the diameter of the head was 0.23 mm. It was 
surmounted by four distinct papillae. The uterus contained ova in various stages of segmentation along 
with embryos which agree with those described under Ichthyonema glohiceps. Length, 0.5 mm. ; greatest 
diameter, 0.013 mm. Exceedingly fine-pointed at smaller end. In the larger specimen the principal 
part of the body, more particularly the anterior half, was literally packed with young. 
CESTODES. 
2. Rhynchobothrium speciosum Linton. Cysts on viscera. 4 , pp. 801-805, pi. lxiv, figs. 13, 14, and pi. 
lxv, figs. 1-7. 
3. Telrarliynchus. Cysts on viscera. 4 , p. 808. 
Balistes vetula, Trigger-fish. 
FOOD. 
Twelve small specimens from Katama Bay were examined September 1, 1899. Amphipods, 
copepods, and seaweed were found in the alimentary canal, but no entozoa. 
Alutera schoepfii, File-fish. 
FOOD. 
The stomachs have usually been empty. Two were seen, however, one on July 24, 1887, the 
other August 5, 1889, in which there were stems of hydroids. In one of these the intestine was filled 
throughout its length with masses of hydroid stems. 
