PARASITES OF FISHES OF THE WOODS HOLE REGION. 
471 
posterior end 0.35, at anal aperture 0.13; distance of anal aperture to posterior end, 0.25. Intestinal 
diverticulum noted at base of oesophagus in smaller specimens. 
CESTODES. 
2. Rhyncliobothrium. Encysted on viscera. 4 , p. 795, pi. lxiii, figs. 3-5. 7 , p. 282. 
3. Tetrarhynchus bisulcatus Linton. Encysted in stomach and intestine. 7, p. 282. 
TREMATODES. 
4. Distomum. appendiculatum. Ruclolphi. Intestine. See 7 , p. 289, pi. xxxvi, figs. 25, 26. Found in 
this host Aug. 5, 1899, and Aug. 10, 1900. 
5. Distomum sp. Intestine. 7 , p. 295, pi. xxxix, fig. 71. Probably the species called by me IK vitel- 
losurn. See under Clupea liarengus, Stenotomus chrysops, etc. 
6. Diplostomum sp. Intestine. One small specimen found Aug. 30, 1899. 
Lopholatilus chamseleonticeps, Tile-fish. 
FOOD. 
Viscera of a number of tile-fish taken July 29, 1899, and placed in formalin were looked over 
and the following food notes made: Crabs in large numbers, the intestines of some of the fish being 
filled with them. A part of a squid was found in one, and in the stomach of another were two spiny 
dog-fish (Squalus cicanthias). In others, taken August 10, 1899, 80 miles south of Gay Head, were 
found many crabs, a bivalve mollusk ( Yoldia ), tests of large sal pa, an eel, and bones of fish. The 
following list was made out from the contents of the alimentary canals of 18 specimens taken July 30, 
1900, south of Marthas Vineyard in 65 to 110 fathoms: Pieces of menhaden (bait) in stomachs of three 
or four; intestines, particularly the lower parts, filled with fragments of crustaceans, in which a few 
mollusk shells, salp;e, annelids, a holothurian, actinians, and fish bones were found. 
For assistance in the following partial identification of this material I am indebted to Mr. Freeland 
Howe: Munidia caribxa (very abundant), eupagurids (abundant), brachyurans (abundant), spider 
crabs, small (many), Nepturus, Yoldia (few), Cardiurn ? (fragment of valve), nereis-like annelid (one 
and fragment), sandy worm-tube (one), Adamsia sociabilis (abundant), Tlvyone sp. (one, identified by 
Dr. H. C. Clark), tunics of Salpa zonaria-cordiformis (numerous), fish bones (otic bones, vertebrae, 
lenses, etc., numerous). 
The tile-fish is preeminently a crab-eater. On account of the nature of its diet, which must be a 
very trying one on any entozoan which attempts to maintain a position in the alimentary tract, not 
many entozoa are to be expected in the tile-fish, and few are found. 
ACANTHOCEPHALA. 
1. Echinorhynchus. Representatives of this genus found on two occasions. 
a. July 29, 1899. An immature specimen from a cyst in the stomach wall. [PI. ix, figs. 6, 7.] 
Only the anterior end could be found when the specimen was mounted, The proboscis is only partly 
everted and its basal portion is retracted for a short distance by the inversion of the anterior end of 
the body; so far as it can be seen, the proboscis is clavate, though it is probably fusiform when fully 
everted. The hooks are prominent; those in about the first four basal rows are arcuate, slender, 
others recurved, all rather large; sheath thickest in middle, tapering toward its posterior end; lemnisci 
slender, a little longer than sheath. Dimensions of specimen mounted in balsam, in millimeters: 
Diameter of base of proboscis (a part of the base is concealed) , exclusive of hooks 0.33, including hooks 
0.44; diameter of apex of part extended, excluding hooks 0.36, including hooks 0.5; length of part of 
proboscis everted, 0.36; length of entire proboscis (estimated), 0.857; length of longest hooks, 0.09; length 
of sheath, 0.87 ; diameter of sheath, anterior 0.36, middle 0.4, posterior 0.26; lemnisci extend about 0.07 
beyond sheath and are about 0.045 in diameter. 
b. July 30, 1900. [PI. n, figs. 8-10.] A small female from the intestine. Body nearly linear, 
tapering ver)' gradually toward the bluntly rounded posterior end. Proboscis erect, cylindrical, with 
numerous hooks placed very close together so that point of one hook overlaps the base of the succeeding 
hook. Hooks in one or two of the basal circles slender and arcuate, others stout and abruptly recurved; 
