PARASITES OF FISHES OF THE WOODS HOLE REGION. 431 



surrounded by a circle of minute teeth, wliich traverses the inidclle nf inner surfaces of lot)es, there 

 being twelve or more of these dentigerous ridges on each lip. 



2. Nenuito'h'n, immature. 



Found on a few occasions iu the alimentary tract, cviilently intrnilured w ith fnml. 



CESTODES. 



3. Echeneibothrium variabile Beneden. Spiral valve. I, pp. 460-462, pi. i, figs. 9-13. 2, i)p. 766-76". 



5, p. 440. t, p. 274. In 1899, 4 found, .32 skates examined. .Inly 9. 1900, 24 skates examined, 

 no E. mriabile. 



4. Rhi/nchobnthriiim imporixpiiie Linton. Spiral valve. 2, pp. 840-843, pi. .\ii, 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 moUusks, Cancer irroratus, and shrimp. 

 July 9, 1900; one specimen obtained froui a lot of 24 skates; length in alcohol, 56 mm. 



5. Rhimchohdlhrium tiniiUiijlHm linton. Spiral valve. Aug. 12, 1.H99; 1. First record of this species in 



the skate. See under Muntchis canix. No. 7. 



6. Tetrarlnjnchus, cj'st.s. Intestinal wall. 4, p. 809. July 19, 1899; two small cysts, with degenerate 



connective ti.ssue in stomach wall. Aug. 17, 1899; several cysts in intestinal wall, tilled with 

 degenerate tissue whit-h effervesces briskly with dilute hydrochloric acid. 



Raja ocellata, Hi:/ SIcali', ]Viril<r Shdr. 



FOOD. 



Squid and annelids. 



XE.M.\TOI)ES. 



1. Xeinntode, immaturi". 7, p. 274. 



CESTODES. 



2. Rhynchobothrinm liiipnrixjjiin I^iutdn. 7, p. 274. i^ee under Raja erinaccn , Xo. 4. 



3. Cyst. Stomach wall. 7, p. 274. 



Raja eglanteria, Brii'i- Raii. 



XE.MATODES. 



1. Axrarix rotundata Rndcilphi. One male specimen in I^. S. X. 51. collection; length, 12 mm. Four 

 small postaual and eight larger preanal papilla' were counted on each side. See under AViyo 

 eriitacea, X<.i. 1. 



Raja laevis, liarmivor Shili: 



FOOD. 



Two spec-iuien.-^ taken by the schooner dniitiiiiis off (Jay Head July 30, 19(10, in H."> to 70 fathoms, 

 and examined hv .Mr. C. \V. Stone, were found to have lobsters in their stomachs. 



1. Rhlndiolliriiiin niiiiunaiii Beneden. Spiral valve. 5, pp. 441—142, pi. .v.vxni, tig. 5. 



2. Acantholxjllirium comnatum Rudolphi. [1^1. xxvi, fig. 293.] Spiral valve. July 30, 1900, 16; the 



longest measured 90 mm. in formalin; several had their heads firmly endiedded in intestinal 

 wall, in which places some of the suri-ounding tissue seems to have undergone some degenera- 

 tion. Dimensions of a specimen in glycerine, slightly comjjressed, 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 la.'^t segment 1, Ijreadth 0.57; length of a 

 free segment 2.7, breadtii 0.9. 



3. Rhyndiobothrium intparispine Linton. Spiral valve. July 30, 1900; 1. First record of this species 



in this host. See under Raja erinacm, Xo. 4. 



4. Telrarliynchns robustus Linton. July 30, 1900; 3 scolices, which look as if they had but recently 



emerged from their cysts. See under Dasyatk cerilrura, Xo. 18. 



TRE.\r.\TODES. 



5. Dislomum veliporum Creplin. Stomach. 6. ])p. 521-522. 



6. Distomiim sp. [PI. xxxi, figs. 348, 349.] 



