434 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
2. Echeneibothrium sp. [PI. xxvi, figs. 285-288.] From a specimen taken by the schooner Grampus 
July 29, 1899, off Gay Head in 65 fathoms. Specimens collected by Mr. J. A. Stewartson. 
Specimens small, not exceeding 10 mm. Length of head of one which measured 7.5 nnn. 
was 0.38 and the breadth 0.43 mm. The bothria were contracted by the formalin, in which they had 
been placed, and their real structure is difficult to make out. Upon superficial view they appear to be 
divided into five loculi, by transverse costae. A single bothrium was separated and placed in acetic 
acid, and showed a structure much like that found in R. minimum ( 5 , pp. 441-442, pi. xxxm, fig. 5); 
that is, nine or ten loculi arranged around a central space. In one specimen the bothria were distinctly 
in pairs, which corresponded to the flat surface of the body. In their contracted condition the bothria 
are attached by their posterior ends and project forward; their borders are finely crenulate; slightly 
tumid immediately behind the . head, but evidently capable of elongation, and may appear very 
different under varying conditions; transversely striate, strise merging quickly into divisions between 
segments. Strobiles clavate, posterior edges of segments slightly projecting. Mature segments not 
seen. A cylindrical myzorhynchus with a terminal aperture was seen in one specimen, projecting a 
little in front of the anterior edges of the bothria. 
3. Acanthobothrium paulum Linton. July 29, 1899; 1. See under Dasyatis centrum, No. 11. 
4. Rhynchobothrium agile Linton. 5 , p. 451, pi. xxxiv, figs. 12-15. 7 , p. 275. 
5. Rhynchobothrium imparispine Linton. July 29, 1899; numerous. The specimens in this lot are 
variable, but the character of the hooks is that of this species. The size is smaller than those 
upon which the species was founded. See under Raja > erinacea, No. 4. 
6. Tetrarhynchus robustus Linton. 7 , p. 276. See under Dasyatis centrum, No. 18. 
7. Rhynchobothrium. Cysts. July 29, 1899; from stomach wall between mucosa and submucosa, about 
2 mm. in length. The hooks seen through sheath suggest R. longispine ( 2 , pp. 835-837, pi. xi, 
figs. 18-20). 
TltEMATODES. 
8. Distomum macrocotyle Diesing. July 29, 1899; 3 and fragment from stomach. The two largest 
specimens measure 16.5 mm. in length and 2 nun. and 3.4 nun., respectively, in breadth. 
Chimaera affinis. 
NEMATODES. 
1. Ascaris rotundata Rudolphi. 
One male, length 22 mm.; fragment of female, length 34 mm.; maximum diameter about middle, 
1.5 mm.; collected by S. E. Meek, Fulton Market, New York, October, 1886. 
Rhinoptera bonasus ( Rhinoptera quadriloba), Cow-nosed Ray. 
FOOD. 
The following material has been noted : Adductor muscles of clam, opercula of some gasteropod 
mollusk (Lunatiaf) packed together like a pile of saucers, a small lobster, fragments of crabs, and 
other Crustacea. 
CESTODES. 
All from spiral valve. 
1. Rhinebothrium cancellatum. Linton. I pp. 771-775, pi. v, figs. 3-5. 
2. Echeneibothrium sp. [PI. xxvi, figs. 283, 284.] Near E. affine Olsson. 1899, Aug.; 3 small speci- 
mens; from ray taken by the steamer Fish Hawk. 
These worms do notexceed 10 mm. in length. They differ from No. 2 under Myliobatis freminvillei 
in the more pedicellate character of bothria and less definite loculi on same. The myzorhynchus, 
instead of being cylindrical, is conical when extended; when retracted the head looks like E. 
variabile, only much smaller. Dimensions of a specimen in millimeters: Length, 7.5; length of both- 
rium, 0.30; breadth of head, 0.50; breadth of bothrium, 0.17; diameter of myzorhynchus, at base 0.07, 
at apex 0.04; diameter of body just behind head, 0.09; last segment (irregular length), 0.73; greatest 
breadth, anterior, 0.23; least breadth, posterior, 0.12; penultimate segment, length 0.38, breadth 0.29. 
3. Tylocephalmn pingue Linton. 2 , pp. 806-809, pi. ix, figs. 5-9. 
4. Rhynchobothrium brevispine Linton. 5 , pp. 450-451, pi. xxxiv, figs. 9-11. 
5. Rhynchobothrium agile Linton. 5 , p. 451, pi. xxxiv, figs. 12-15. 
6. Tetrarhynchus robustus Linton. 5 , p. 452. See also under Dasyatis centrura, No. 18. 
