436 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
5. Rhynchobotlirium heterospine Linton. 4, p>. 799, pi. lxiv, figs. 3-8. See under Mustelus canis, No. 8. 
6. Rhynchobotlirium imparispinc Linton. 7, p. 276. See under Raja erinacea, No. 4. 
7. Rhynchobotlirium bulbifer Linton. Aug. 12, 1899; numerous cysts on viscera. 
8. Rhynchobotlirium. Cysts. 4, p. 794, pi. Lxri, fig. 16, and pi. txnr, fig. 1. 7, p. 276. 
9. Larval cestocles (Scolex polymorphus Dujardin). 7 , p. 276. Seen also Aug. 12, 1899. 
TKEMATODES. 
10. Distonium grandiporum Rudolphi. 6, pp. 520-521, pi. xliv, fig. 9. Aug. 28, 1899; 1. Length, 
10 mm. See under Pseudopleuronectes americanus, No. 6. 
11. Distomum vitellosum Linton. Aug. 12, 1899; 1. See under Merlucc-ius bilinearis, No. 9. 
12. Distomum sp. [See pi. xxv, figs. 228,229.] Aug. 10, 1900. 
Resembles species figured in 7, pi. xxxiv, fig. 72. Dimensions in millimeters: Length, 1.96; 
breadth, 0.58; diameter of oral sucker 0.19, of acetabulum 0.19; length of pyriform pharynx, 0.17, 
greatest breadth 0.1; ovum 0.076 and 0.038 in the two principal diameters. Cirrus and uterus pass to 
right of acetabulum. Specimen not in good condition; probably introduced with food. 
Leptoceplialus conger, Conger Ed. 
FOOD. 
Fish. Aug. 2, 1899; 1; fish in stomach. July 30, 1900; 1; fish in the alimentary canal. July 
31, 1900; 1; a herring and 3 butter-fish in stomach; crystalline lenses and other fragments of fish 
in intestine. August 25, 1900; 1; young eel and fish in stomach; fin rays and an annelid ( Nereis ) in 
intestine. 
ACANTHOCEPHALA. 
1. Echinorhynchus acus Rudolphi. July 31, 1900; 7; stout-bodied, yellowish; flaccid when first 
removed from intestine, became plump after lying in sea water. Aug. 25, 1900; 1; length, 
20 mm. For account of species, see 1, p. 492, and 3, p. 525. 
NEMATODES. 
2. Dacnitis hums Dujardin. [PI. xvi, figs. 203, 204.] July 30, 1900; 1; from eel taken by schooner 
Grampus off Gay Head in 65 to 70 fathoms; collected by C. W. Stone. 
This specimen agrees with Dujardin’s description, but is smaller in some of its dimensions. It 
probably came from the intestine, since it is an adult female with ova in the uterus undergoing 
segmentation. Dimensions in millimeters: Length, 20; diameter of head, 0.26; of body at middle, 
C.41; length of oesophagus, 1.23; distance of anal aperture lrom posterior end, 0.65; ova, 0.08 and 0.05 
in the two principal diameters; of nearly uniform diameter throughout. A few found August 25, 1900. 
3. Immature nematodes. Encapsuled on intestine. Several. Same host as No. 2. 
CESTODES. 
4. Rhynchobotlirium imparispine Linton. Several larvse in pyriform blastocysts and cysts on serous 
coat of intestine. Same host as No. 2. For description of species, see 2, p. 840. 
5. Larval cestodes (Scolex polymorphus Dujardin). Free in intestine. Aug. 2, 1899; July 31, 1900. For 
account of similar forms see 5, p. 789. 
TKEMATODES. 
6. Distomum simplex Rudolphi. Aug. 2, 1899; 2. For description of species, see 6, 525. 
Dimensions of specimens in water, given in millimeters: Length, 4; diameter, anterior 0.21, at 
middle 0.61, posterior 0.21; length of oral sucker 0.21, depth 0.19; length of acetabulum 0.37, 
depth 0.36; ovum, 0.073 and 0.045 in the two principal diameters; length of second specimen, 2.07. 
See under Microgadus, No. 6. 
7. Distomum vitellosum Linton. Intestine. 7 „ p. 290, pi. xxxvii, figs. 38, 39. 
Six small specimens which agree best with this species; collected August 25, 1900. The worms 
were turgid and motionless, although they were examined as soon as collected, at which time they 
had been put in salt water. Some specimens of this species, collected at the same time as these, but 
