PARASITES OF FISHKS OF THE WOODS HOLE REGION. 471 



posterior end 0.35, at anal aperture O.lo; distance of anal ajierture to posterior end. O.L'.'i. Inlcslinal 

 diverticulum noted at ba.se of (esophagus in smaller specimens. 



CESTODES. 



2. Rhiiti<-lii)li<illii-ium. Encysfeil on viscera. 4, p. 795, pi. i.xiii, figs. 3-.'). 7, ]i. 2S2. 



3. I'l'lrdylii/nchiix bixiilmliix Linton. Encysted in stomach and intestine. 7, p. 2S2. 



THRM.VTOnES. 



4. Dixioiiiiim (ippcvdiciilfdirni Rudolphi. Intestine. See 7, p. 2.S9, pi. \x\vi, figs. 2.5, 26. Fcnind in 



tins host Aug. 5, 1899, and Aug. 10, 1900. 



5. Dixliiniiiiii sp. Intestine. 7, p. 295, jil. ,\.\xix, fig. 7L I'mlialily the sjiecies i-alled hy me 1). rlli'l- 



IdXHiii. See under VUijiea Jiamu/tis, Sli'iiotomus rliri/x(jjis, etc. 

 G. Dlplnxliiiiiiiiii sp. Intestine. One small specimen found Aug. .'iO, 1.S99. 



Lopholatilus chamseleonticeps, Tili'-jisJi. 



Viscera of a number of tile-fish taken July 29, 1899, and placed in formalin were looked over 

 and the following food notes made; Crabs in large niunbers, the intestines of some of the fish being 

 filled with them. A part of a squid was found iu one, and in the stomach of another were two spiny 

 dog-fish (Sc/iKilus iirdDthins). In others, taken August 10, 1899, 80 miles south of Gay Head, were 

 foimd many crabs, a bivalve nioUusk {¥(31(11(1), tests of large salpa, an eel, and bones of fish. The 

 following list was made out from the contents of the alimentary canals oi 18 specimens taken July 30, 

 1901), south of JNIartbas Vineyard in 65 to 110 fathoms: Pieces of menhaden (bait) in stomachs of three 

 or four; intestines, ])articularly the lower parts, filled with fragments of crustaceans, in which a few 

 moUusk .shells, salpa', annelids, a holothurian, actinians, and fish bones were found. 



For assistance in the following pai'tial identification of this material I am indebted to Mr. Freeland 

 Howe: Muxidia (-(trikra (very abundant), eupagorids (abundant), braehyurans (abundant), spider 

 crabs, small (many), Kepiurux, Yohlia (few), Canlium.f (fragment of valve), nereis-like annelid (one 

 an<l fragment), sandy worm-tube (one), AdamsUi xociahilis (abundant), Thyime sp. (one, identified by 

 l>r. II. C. Clark), tunics of Salpd Z(jnaria-curdif(irmis (numerous), fish bones (otic bones, vertcbne, 

 lenses, etc., numerous). 



The tile-fish is preeminently a crali-cater. On account of Ihe nature of its diet, which must be a 

 very trying one on any entozoan which attempts to maintain a position in Uiv alimentary trad, not 

 many entozoa ai'e to be expected in the tile-fish, and few are found. 



AC,\NTnorEi'n.\LA. 



1. Echinorhynclius. Representatives of this genus found on two occasions. 



(I. July 29, 1899. An immature specimen from a cyst in the stomach wall. [PI. ir, figs. 0, 7.] 

 Only the anterior end could be found when the specimen was mounted. The proboscis is only i)arth' 

 everted and its basal portion is retracted for a short distance by the inversion of tlie anterior end of 

 the body; so far a.s it can be seen, the proboscis is clavate, though it is probably fusiform when fully 

 everted. The hooks ai-e prominent; those in about the first four basal rows are arcuate, slender, 

 others recurved, all rather large; sheath thickest in middle, tapering toward its posterior end; lemnisci 

 .slender, a little longer than sheath. Dimensions of specimen mounted in balsam, in millimeters: 

 Diameter of base of proboscis (a part of the ba.se is concealed) , exclusive of hooks 0.33, including hooks 

 0.44; diameter of apex of part extended, excluding hooks 0.36, including hooks 0.5; length of part, of 

 proboscis everted, 0..36; length of entire jiroboscis (estimated ), 0.857; length of longest hooks, 0.09; length 

 of sheath, 0.87; diameter of .sheath, anterior 0.36, middle 0.4, posterior 0.2(i; lenmisci extend about 0.07 

 beyond sheath *xnd arc alxmt 0.045 in diameter. 



h. July 30, 1900. [PI. II, figs. 8-10.] A small female from the intestine. Body nearly linear, 

 tapering very gradually toward the bluntly 7-ouniled posterior end. Proboscis erect, cylindrical, with 

 numerous hooks placed very close together so that )ioint of one hook overlaps tlu' base of thesucceeding 

 hook. Hooks in one or twoof tbeba-sal circles slender and aicuate, others stiml and abruiitly recurved; 



