486 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
attenuate posteriorly; lips with papillae and dentigerous; body rather rigid and crossed by uniform 
transverse wrinkles; no alte; postanal region short conical, tip slightly mucronate. Two postanal 
papillae seen, and at least twenty preanal papillae counted on one side; spines* slender. Dimensions 
in millimeters: Length, 17; diameter of head 0.18, 1 mm. back of head 0.32, maximum 0.65, 1 mm. 
from posterior end 0.47, at anal aperture 0.18; distance of anal aperture from posterior end, 0.13; length 
of oesophagus, 2.8; upper lip, length 0.16, breadth 0.14. 
CESTODES. 
3. Tetrarhynchus bisulcatus Linton. Encysted in stomach wall. Aug. 16, 1900. See I, p. 810, etc. 
4. Tetrarhynchus. Encysted on peritoneum. 4, p. 809. 
TREMATODES. 
5. Distomum appencliculatum Rudolphi. Intestine. Aug. 16, 1899; few. See 7, p. 289. 
6. Distomum. grandiporum Rudolphi. Intestine. Aug. 10, 1900; 1. See©, pp. 520-52:1, nl. xliv, fig. 9. 
This specimen agrees with published descriptions of this species very closely. Body smooth, 
translucent yellowish white by transmitted light. During life the worm was yellowish-white with 
reflected light, suckers pale; genitalia generally, including the uterus, opaque white; intestine 
conspicuous, dark brown, rami unbranched, but with irregular outline, extending to posterior end. 
Some of the dark-brown contents of the intestine ejected from the mouth while the worm was under 
pressure. The worm was very active, and the caudal appendix was long, slender, and attenuate. While 
under pressure the worm naturally lay on its side. In that position the acetabulum was seen to be 
much larger than the oral sucker. The worm showed a disposition to double up and adhere by both 
suckers to the posterior part of the body; while so doing considerable portions would be drawn inside 
the cavities of the suckers. When placed in the killing fluid it contracted to about 5 mm. and became 
cylindrical and plump. 
7. Distomum globiporum Rudolphi (?). Intestine. [PI. xxxr, fig. 347.] Aug. 30, 1899; 3. 
These specimens agree very closely with descriptions of this species. About the only difference 
that I note is that in these the oesophagus is not longer than the pharynx. Dimensions of a specimen 
in glycerine given in millimeters: Length, 4.35; diameter, anterior 0.51, middle 1, posterior 0.22, of 
oral sucker 0.33, of acetabulum 0.36; pharynx globular, diameter 0.16; anterior testis, length, 0.58, 
breadth 0.62; posterior testis, length 0.53, breadth 0.58; ovary globular, diameter 0.22; ova, 0.71 and 
0.50 in the two principal diameters. But one ovum was seen in the specimen measured. The ovary 
lies a little to the right of the median line. It is immediately preceded by the cirrus pouch. The 
cirrus passes to right of acetabulum and opens at its anterior border on the median line. The acetabulum 
is situated at about the anterior fourth. Testes close together on median line, a little back of middle. 
Vitellaria fill posterior part of body back of testes and extend laterally nearly to the acetabulum. 
These specimens closely resemble those referred to D. simplex, but differ in size and in the proportions 
of the suckers. 
8. Distomum vitellosum Linton. Intestine. 7, p. 290. [PI. xxx, fig. 340, a, 5.] Aug. 16, 1899. 
A few small distomes, of exceedingly variable form while living, suggest D. commune Olsson 
(Ent. Skand. Hafsfisk, ii, p. 13, iv, p. 79). Body smooth, cylindrical; acetabulum prominent, much 
larger than oral sucker. Length of alcoholic specimen, 0.87 mm.; diameter, 0.36 mm. A living 
specimen, 1 mm. in length when contracted, measured 1.72 mm. a few seconds afterwards. In 
life the transverse diameter of the oral sucker was 0.14 mm., of the acetabulum 0.24 mm. An ovum 
measured 0.048 and 0.031 mm. in the two principal diameters. In alcoholic specimens the body 
is elliptical-oblong, the neck is very short, conical. The acetabulum is twice the diameter of the 
oral sucker, and has a narrow, transverse opening. The' oesophagus is short, the pharynx rather large 
and globose. The vitellaria extend from posterior end to the acetabulum. Genital aperture in front 
of acetabulum to the left of the median line. The habit of the body is rather stouter, and its walls 
appeared to be somewhat more resistant than D. vitellosum; otherwise the agreement with that species 
is very close. 
9. Distomum areolatum Rudolphi. Aug. 5, 1899; numerous. See 7, p. 293, pi. xxxix, figs. 60-63. 
10. Distomum sp. In globular cysts on viscera and in intestinal walls. Aug. 30, 1899. 
