PARASITES OF FISHES OF THE WOODS HOLE REGION. 
443 
ACANTHOCE PH A LA . 
1. Echinorhynchus pristis Rudolphi. 3, pp. 530-531, pi. lvi, figs. 31-38. Yar. tenuicornis. 3, pp. 
531-532, pi. lvi, figs. 39-41, and pi. lvii, figs. 42-53. 
NEMATODES. 
2. Ascaris sp. Immature. Intestine. An immature female, 17 mm. long. Lateral a lie for about 1 
mm. back of head. Postanal region somewhat elongate, line spines at posterior tip. Longi- 
tudinal muscle bundles strikingly prominent in acetic acid. Resembles No. 1 under Microgaclus 
tom cod. 
CESTODES. 
3. Dibothrium restiforme Linton. Intestine. 2, pp. 722-728, pi. i, figs. 1-16. 
4. Rhynchobothrium speciosum Linton. Larvae encysted on viscera. 4, pp. 801-805, pi. lxv, figs. 4,5. 
TREMATODES. 
5. Distomum nitens Linton. t>, pp. 534-535, pi. li, figs. 5, 6, and pi. lit, fig. 1. 
Gasterosteus bispinosus, Two-spined Stickleback. 
TREMATODES. 
One small distome was obtained from the intestine of this species July 24, 1900. A sketch 
was made of it while it was living. Unfortunately the specimen was lost and no further details of its 
anatomy than are shown in the sketch can be given. [PI. xxxi, fig. 350.] 
Apeltes quadracus, Four-spined Stickleback. 
FOOD. 
In the summer of 1900 I examined a small number of this and also of the nine-spined and 
two-spined stickleback. Most of them hail been in the aquarium some time and the alimentary tracts 
were empty. Four taken at Wareham, Aug. 2, had their intestines filled with copepods. 
Siphostoma fuscum, Pipe-fish. 
FOOD. 
Small crustaceans found in alimentary canal of pipe-fish taken at Wareham, August 2, 1900. 
CESTODES. 
1. Rhynchobothrium heterospine Linton. 
A few cysts from a specimen taken in Katama Bay, August 28, 1900, resemble the forms figured in 
4, pi. lxiv, fig. 3. The larva; when liberated were found to agree with this species in the character 
of hooks. 
Menidia notata, Silverside. 
FOOD. 
August 28, 1899; 26; small Crustacea and vegetable material. August 30, 1899; 23; annelids and 
shrimp. July 17, 1900; 50; seta;, spines, and jaws of annelids {Nereis), a few small (young) univalve 
moliusks, and small crustaceans. July 27, 1900; 6. Enormous numbers of small (young) univalve 
mollusks (0.3 mm. and less in length), diatoms, and sand; small copepod parasites on gills, very 
numerous. 
NEMATODES. 
1. Immature nematodes. Aug. 30, 1899; 2. July 17 and 27, 1900; 1 and fragment. 
CESTODES. 
2. Rhynchobothrium. Larvae encysted on viscera, Aug. 30, 1899. 
