460 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
6. Rliyneliobothrimn. Encysted on viscera. 4 , p. 794, pi. lxiv, fig. 1, and p. 798. 7, pp. 280-281. 
Usually on the viscera (1899, 1900), associated with immature nematodes and of several species. 
7. Rhy nchobot.hr ium spedosum Linton. Larvae encysted on viscera. 4 , pp. 801-805, pi. lxiv, figs. 
13, 14, and pi. lxvi, figs. 1-7. 
8. JUiynchobothrium, buibifer Linton. Encysted on viscera. See 1 ( R . tenidcolle Rudolphi ) , pp. 486-488. 
* 4 , pp. 825-829, pi. x, figs. 8,9. 4 , p. 793. 5 , p. 448. Aug. 6, 1900. 
9. Telrarhynchus bisulcatus Linton. Encysted in stomach wall. 4 , pp. 810-811, pi. lxvi, figs. 11-15. 
7, pp. 280-281. In submucosa of stomachs almost always present (1899 and 1900). [PI. 
xxiii, fig. 261, and pi. xxiv, figs. 262-264.] 
10. Tetrarhynchus erinaceus Beneden. On viscera. 4 , pp. 811-812, pi. lxvii, figs. 1-8. 7, p. 281. 
11. Synbothrium filicolle Linton. On viscera. I, pp. 815-820, pi. lxviii, figs. 7-12. Noted in a few 
cases in 1899. 
lift See pi. xx, fig. 230 and description of same, for brief account of a larval cestode from a squid in 
the stomach of a squeteague. This form is related to the genus Thysanocephcilum. 
TREMATODES. 
12. Distomum appendiculatum Rudolphi. Intestine. See 7 , p. 289, pi. xxxvi, figs. 25, 26. Found in 
this host July 25 and Aug. 5, 1899. 
13. Distomum vitellosum Linton. Intestine. See 7, p. 290, pi. xxxvn, figs. 38, 39. 
Found once in July, 1899, four times in July and August, 1900; rather numerous. The difference 
in appearance between a specimen in sea water or salt solution and the same specimen in fresh water 
is very great. See under Stenotomus, Raralichthys, etc. 
14. Distomum pyriformc Linton. Intestine. See 7, p. 290, pi. xxxvin, figs. 52-59. 
Small oval distomes; body covered with minute spines; acetabulum and oral sucker nearly equal; 
testes median, one behind the other; ova few and large; found twice in 1899 and twice in 1900; appear 
to belong to this species. 
15. Distomum polyorchis Stos ich. [PI. xxxin, figs. 363-365.] 
On five occasions in the summer of 1900 distomes were found in the pyloric caeca of the squeteague, 
which agree very closely with this species. The synopsis of the species given by Stossich is as follows: 
Body flattened, elliptical, rounded at the extremities. Anteriorly the surface is covered with conical 
spines set in transverse series. The acetabulum is situated at the anterior third, is somewhat smaller than 
the oral sucker and prominent. The oral sucker is terminal, globular, and its small aperture circular. 
It is joined by a slender canal with the pharynx, which is very large and of quadrangular form. 
There is no oesophagus. Immediately behind the pharynx the intestine divides into two branches 
which extend to the posterior end of the body; anteriorly, however, each branch is prolonged into a 
ciecum which extends as far as the anterior border of the pharynx. That which characterizes the 
species more particularly is the large number of testes. Some of the worms contain 24 placed in two 
series longitudinally in the middle of the body. The cirrus pouch is club-shaped, large, and forms an 
arch at the right side of the acetabulum. In it is the seminal vesicle, divided into two unequal parts 
by a constriction. The vitelline glands occupy all the posterior part and sides of the body and extend 
laterally as far as the bifurcation of the intestine. They empty into two longitudinal canals which are 
joined with each other by a transverse median canal, which is provided with a vitelline receptacle of 
rectangular shape. The oviduct, situated between the acetabulum and the testes, contains minute ova, 
elliptical and of a yellowish-brown color. The aperture is beside the anterior margin of the acetabulum. 
Length, 3.5 mm. to 6.5 mm.; breadth, 1 mm. to 1.5 mm. Bull. d. Soc. Adv. d. Sci. Nat. Trieste, vol. 
xi, 1889, tav. xiv, fig. 61 [p. 2 of extract.]. 
The number of the testes was variable in my specimens. The following numbers were noted. 
In each case the number in the right row is placed first: 15-15; 15-12; 14-16, two; 14-15, three; 14-13, 
two; 14-12, two. It is to be understood that each of these testes is either double or two-lobed, a point 
that will be settled when the specimens are sectioned. 1 The process of egg making was observed in 
1 Sections show that the testes tire double; in other words, that they are placed in four instead of two longitudinal 
series, two dorsal and two ventral; further, that the intestinal rami in the posterior and median portions of the body have 
numerous short branches. 
