PARASITES OF FISHES OF THE WOODS HOLE KEOION 467 



NEMATODES. 



2. Immature, nematodes (Ascaris). 7, p. 282. 



Two lots of these si>eeimens, collected by Vinal N. Edwards November r>, 1886, and October 24, 

 1887, arc in the U. S. Nati.onal Museum collection. They are of nearly uniform diameter, but taper a 

 little more anteriorly than posteriorly; the larsrest are 22 mm. in lensith and O.b mm. in "-reate.st 

 diameter. They agree with immature ascarids from Priouotus rarolimm. 

 2a. Ascarls sp. [PI. viii, flgs. 70-72.] 



Specimen, a female, collected by S. F,. Meeic, Fulti>n Market, New York, October 28, 1886. 

 Dimensions in millimeters: Length, 50; diameter, head 0.26, maximum (posterior third) 1.7.5, 1 mm. 

 from head 0.26, 1 mm. from posterior end 0.9, at anal aperture 0..32; distance of anal aperture from 

 ■ posterior end, 0.4. 



CESTODES. 



3. .1 larral i-cxioil,; [.roliably Diholhriiini sji. On viscera. 



Small, somewhat fiask-shape, with pore at anterinr end. .July 27, 1900. 



4. lilnjiii-lujlivthi-ium sp. Cysts in muscles. 4, p. 798. 



TKEM.\T0r)ES. 



5. Disltiiiium nppcnrViciiliiliiiit 'R\v\(>\\A\\. Intestine. .July 27, 1900. See 7, p. 2.S'.i, pi. xxxvi, figs. 2."i, 26. 



Dimensions in millimeters (alcoholic specimens) : Length. 2.10; cliameter oral sucker 0.06.5, of 

 acetabulum 0.148; ova, 0.024 and 0.010 in the principal diameters. 



Cottunculus thomsonii. 



NEM.\Tol)ES. 



I. Ascnris sp. [PI. IX, figs. 84-87.] 



Fourteen specimens from stomach of fish taken by steamer .4//<a(ross, stat'on2739, 1887; depth, 811 

 fathoms. Body thickened posteriorly, attenuate anteriorly, most rapidly for first 5 mm., crossed by 

 minute transverse striic, which are 0.02.5 mm. apart. Length of lips about equaling diameter of head; 

 lateral lip.s each with a single papilla near front edge; anterolateral edges jirominent and rounded; 

 lateral membrane of lip narrow; triangular interhp large; lips unsymmetrical. Posterior end of Ijody 

 curved in males, straight in females. The largest specimen measured 97 mm. in length and 1.5 mm. 

 in diameter. Dimensions of another specimen, a female, in millimeters: Length, 84; diameter of head 

 0.2, near midclle 1.25, 10 mm. from po.sterior end 1.3, at anal aperture 0.5; length of lips, 0.2; distance 

 of anal aperture from posterior end, 0.8 The larger males nearly equal the larger females. Two 

 postanal jiapillie were made out in side view of larger specimens. In a smaller specimen, 28 mm. in 

 length, 3 postanal on each side and 17 preanal on one side and 19 on the other were seen. These were 

 arranged in a single row on each side. Spines slender and sharp-pointed; length, 2 mm.; diameter, 

 0.02 mm. 



Hemitripterus americanus, Srn Riinn, lied IScidpin. 



XE.M-VTODES. 



1. .l.sc(ot.5 .sp. [PI. IX, figs. 91-94, and pi. xiii, tigs. 157-159.] 



U. S. National Museum collection; collected by Vinal N. Edwards, November 5, 1886. These 

 worms are of nearly uniform diameter throughout, a little thickened posteriorly, the tail recurved. 

 Narrow alai were observed near the head of one, a female; body smooth. A male, 40 mm. in length, 

 diameter of head 0.23 mm. and of body 0.7 mm., and length of spines altout 0.3 mm., had about twenty 

 preanal paiiilUe on one side. These ap])eared to lie in a single row, the ]>osterior ones being close 

 together and small, the anterior ones more sparsely distributed and larger; postanal region short. 



Another lot, collecteil also by IMr. Edwards, October 12, 1887, appear to Ije immature females of 

 the same species. The embryonic cuticle was still adherent to the posterior end of one. The ake 

 back of the head were more distinct and the postanal region rather more elongated. Dimensions in 

 millimeters: Length, 20; diameter of head 0.25, middle 0.6, at anal aperture 0.23; distance anal 

 aperture from posterior tip, 0.34. 



