PARASITES OF FISHES OF THE WOODS HOLE REGION". 
431 
surrounded by a circle of minute teeth, which traverses the middle of inner surfaces of lobes, there 
being twelve or more of these dentigerous ridges on each lip. 
2. Nematodes, immature. 
Found on a few occasions in the alimentary tract, evidently introduced with food. 
C'ESTODES. 
3. Echeneibothrium variabile Beneden. Spiral valve. 1 , pp. 460-462, pi. i, figs. 9-13. 2 , pp. 766-767. 
5 , p. 440. 7 , p. 274. In 1899, 4 found, 32 skates examined. July 9, 1900, 24 skates examined, 
no E. variabile. 
4. Rhynchobothrium imparispine Linton. Spiral valve. 2, pp. 840-843, pi. xn, figs. 6-9. 5, p. 450. 
July 27, 1899, blastocyst, with larva, in stomach. Aug. 4, 1899; larva, in stomach. Food 
in two latter cases consisted of annelids, bivalve mollusks, Cancer irroratus, and shrimp. 
July 9, 1900; one specimen obtained from a lot of 24 skates; length in alcohol, 56 mm. 
5. Rhynchobothrium tumidulum Linton. Spiral valve. Aug. 12, 1899; 1. First record of this species in 
the skate. See under Mustelus cards, No. 7. 
6. Tetrarhynchus, cysts. Intestinal wall. 4 , p. 809. July 19, 1899; two small cysts, with degenerate 
connective tissue in stomach wall. Aug. 17, 1899; several cysts in intestinal wall, filled with 
degenerate tissue which effervesces briskly with dilute hydrochloric acid. 
Raja ocellata, Big Skate, Winter Skate. 
FOOD. 
Squid and annelids. 
NEMATODES. 
1. Nematode, immature. 7 , p. 274. 
C'ESTODES. 
2. Rhynchobothriam imparispine Linton. 7 , p. 274. See under Raja erinacea, No. 4. 
3. Cyst. Stomach wall. 7 , p. 274. 
Raja eglanteria, Brier Ray. 
NEMATODES. 
1. Ascaris rotundata Rudolphi. One male specimen in U. S. N. M. collection; length, 12 mm. Four 
small postanal and eight larger preanal papillae were counted on each side. See under Raja 
erinacea, No. 1. 
Raja la:vis, Barndoor Skate. 
FOOD. 
Two specimens taken by the schooner Grampus off Gay Head July 30, 1900, in 65 to 70 fathoms, 
and examined by Mr. C. W. Stone, were found to have lobsters in their stomachs. 
C'ESTODES. 
1. Rhinebothriuni minimum Beneden. Spiral valve. 5 , pp. 441-442, pi. xxxin, fig. 5. 
2. Acantliobothrium coronatum Rudolphi. [PI. xxvi, fig. 293.] Spiral valve. July 30, 1900, 16; the 
longest measured 90 mm. in formalin; several had their heads firmly embedded in intestinal 
wall, in which places some of the surrounding tissue seems to have undergone some degenera- 
tion. Dimensions of a specimen in glycerine, slightly compressed, in millimeters: Length, 58; 
length of head, 1; breadth of head, 1; breadth of neck, 0.4; length of hooks, 0.17; length of 
first distinct segments, 0.03; breadth, 0.45; length of last segment 1, breadth 0.57; length of a 
free segment 2.7, breadth 0.9. 
3. Rhynchobothrium imparispine Linton. Spiral valve. July 30, 1900; 1. First record of this species 
in this host. See under Raja erinacea, No. 4. 
4. Tetrarhynchus robustus Linton. July 30, 1900; 3 scolices, which look as if they had but recently 
emerged from their cysts. See under Dasyatis centrum, No. 18. 
TREMATODES. 
5. Distornum veliporum Creplin. Stomach. <i, pp. 521-522. 
6. Distornum sp. [PI. xxxi, figs. 348, 349.] 
