PARASITES OE FISHES OF THE WOODS HOLE REGION. 
473 
becomes prominent, and the general appearance becomes much altered. While this specimen differs 
considerably in its outlines from the one figured in the original description, the difference is not so 
great as I have seen in other species, due to difference in treatment. 
Remora remora (Echeneis remora) , Remora, Sucker. 
FOOD. 
Of the nine remoras examined the stomachs were empty in all but two; one of these contained 
the bones and tail of a fish resembling the menhaden; the other contained a squid. 
CESTODES. 
1. Rhynchobothrmrn speciosum Linton. Cysts on viscera. 4, pp. 801-805, pi. lxiv, figs. 13, 14, and pi. 
Lxv, figs. 1-7. 
TREMATODES. 
2. Distomum lageniforme Linton. Intestine. <*, pp. 524-525, pi. xlvii, figs. 1, 2. 
3. Distomum monlicellii Linton. Intestine. 6, pp. 518-520, pi. xliv, figs. 2-8. Aug. 17, 1899; 4. Aug. 
9, 1900; 7. On gills. 
The preserved specimens of these two lots measure from 4 to 5 mm. in length. While living 
they vary, with different stages of contraction, between 4 mm. and 10 mm. In the living worm the 
body was transparent, slightly tinged with yellow; folds of uterus orange, lighter in posterior part of 
body; suckers also transparent tinged with yellow; testes, seminal vesicle, and cirrus pouch white. 
Merluccius bilinearis, Silver IJake, Whiting, Frost-fish. 
FOOD. 
Stomachs empty in most of the specimens which have been examined. The following have been 
noted: Fragments of fish on two occasions; small Crustacea in intestine of one; many crabs ( Panopeus ) 
in stomach and intestine of one. 
AC ANTITOCEPn A LA . 
1. Echinorhynchus acus Rudolphi. Intestine. One specimen, a female, July 11, 1900. 
This specimen was smaller and more slender than the worms from the winter flounder and others 
which I have referred to this species. The proboscis is cylindrical; hooks very regularly placed, 
twelve in each of the eight vertical rows which are visible on one side. See 3, p. 525, etc. 
NEMATODES. 
2. Immature nematodes ( Ascaris ). [PI. xm, figs. 160-162.] Serous coat of viscera. 7, p. 282. 
Found in the specimens examined in the summers of 1899 and 1900. Some of those found in 
1900, which were particularly abundant on the pyloric caeca, can be recognized as young of the genus 
Ascaris. These were reddish or reddish-brown and from 5 to 16 mm. in length. Collected also by 
S. E. Meek, Fulton Market, New York, November, 1886. “Abdominal cavity appeared swarming 
with the worms. All were very lively.” Dimensions of one in millimeters: Length, 22; diameter, 
0.43; length of oesophagus, 2.6. Figs. 160, 161, are from the latter. 
CESTODES. 
3. Dibothrium crassiceps Rudolphi. Intestine. [PI. xxiv, figs. 266-268.] Aug. 5, 1899; 1 . Scolex and 
short strobile. 
Length, 8 mm. (alcoholic); number of joints, about 40. Dimensions in millimeters, life: Length 
of head, marginal view, 1; length of bothrium, lateral view — i. e. , corresponding to the fiat surface of 
the body 1.14; breadth of head, corresponding to marginal view of body 1.5, corresponding to fiat 
surface of body 1.3; breadth of first segment, anterior 0.78, posterior 1.07, thickness 0.36. Posterior 
segments show rudiments only of the reproductive organs, but no indication of external genital 
opening. The cuticle is covered with minute spines. In the alcoholic specimen the head is nearly 
spherical. See No. 6, under Pomatomus saltatrix. 
