PARASITES OF FISHES OF THE WOODS HOLE REGION. 47V) 



NEMATODES. 



2. Iiiimiilnrc iicinritoih'^. 



Rather mimorous; different sizet^, but all small ami iiniriatiire. Diiiioiisions nf mu- in iiiillii]irtci>: 

 Lengtli, 18; diameter, anterior 0.09, middle 0.(i, at base of lesophagas 0.38, at anal aperture o. I'.l; 

 distance of anal apertun^ from posterior end, 0.25; length of (esophagus, 0.65. Diverlieuhnn limu 

 (esophagus at its juncture with tlie intestine. 



THEiM.\T(U>i;S. 



.'?. DlsUiiiiniii sp. [PI. xxix, fig. ;->o0.] 



A small nuudier obtained from the intestine. These resemble D. Icnue, but oral spines are 

 wanting. The following characterization is based on alcoholic specimens: Body elongate, linear, 

 depressed; neck slightly elongate, equaling about one-tifth of the whole length, armed with minute, 

 flat spines; mouth unarmed; oral sucker .somewhat smaller than acetabulum, nearly globular, but 

 witli notch on posterior inner border; aeetaljulum nearly globular, transverse diameter exceeding the 

 length; pharynx oblong, separated by a distance ei;iual to its length from the oral sucker and followed 

 by an (esophagus of eiiual lengtli; intestinal rami simple, elongate, extending to near the postericir 

 end of the body; testes, two in posterior half, occupying nearly whole diameter of the body, separated 

 from each other Ijy a space equal to the diameter of each; anterior testis preceded by the globular 

 ovary; ova relatively few (50, more or less) and large; vitellaria generally distributed in tiie b(xly 

 back of acetabulum, especially at pcsterior end and along margins, in transverse sections app(^aring as 

 snl)globular bodies around the periphery; seminal n^ceptacle dorsal to acetabulum; genital opening 

 in front of the acetabulmn and clo.se to it on the median line. 



Dimensions of specimen cleared in acetic acid, slightly conij>ressed, in millimeters: ijength, S.l)2; 

 diameter, middle of neck 0.32, maximum 0.5, near posterior end 0.3, transverse of oral sucker 0.1.'! 

 {in another specimen 0.11), transverse of acetabulum 0.17 (in another 0.13); pharynx, length 0.12, 

 breadth 0.07; diameter, of ovary 0.23, of anterior testis 0.32, of posterior testis 0.35; ova, 0.07 and 0.04 

 in the two principal diameters. Spines seen only on the neck, longest on ventral side of neck, where 

 they are about O.OOti mm. in length. In one specimen the oral sucker nearly e(iualed the acetabuluiu, 

 the diameters being 0.27 and 0.29 mm. These specimens resemble'/J. iiicrem-i-nn Olsson, but cliffer 

 from that species in the proportions of the suckers and in the position of the genital aperture. 



Brosmius brosme, /,oi;/. 



V. S. National Museum collection. The label reads: "Ling, stomach, V<. S. Fish Clonnnission 

 steamer Alhitln)!<n, station 2577, 1885." This station was established Seiitember 4, 1885, off Marthas 

 Vineyanl; depth, 32 fathoms. 



NEM.Vr(.)l)ES. 



1. J.sr(o-/.v sji. Inunature. Stomach. 



Ten and 3 fragments. Length, al^out 25 nun.; attenuate anteriorly, thickened toward posterior 

 end, which is short-pointed and mucronate; surface of body crossed by line transverse stride, most 

 easily seen toward the posterior end. Dimensions in millimeters of a male and a female, tlie 

 dimensions of the male given first: Length, 25 and 25; diameter of head 0.2 and 0.2, 2 mm. back of 

 head 0.35 and 0.45, middle 0.50 and 0.63, 2 mm. from posterior end 0.6 and 0.62, at anal aperture 0.15 

 and 0.3; distance of anal aperture from posterior end, 0.18 and 0.4; length of head, 0.15 and 0.17. The 

 breadth of the upi)er lip in the male was 0.14 and its length 0.15; length of copulatory spines 1.3, of 

 (esophagus 3; no papillie were made out. Some variability was noted in the ])roportions vi the upper 

 lip in different specimens. There was, however, but little difference between the length and the 

 breadth. The length was not less than the lireadfh, Ijut it did not exceed the breadth nmch in any case. 



Nematonurus goodei ( Macrwrus <ixper). 



NE.M.iTODES. 



1. Aficarls linHtowi. i^p. nov. Stomach. [PI. iii, figs. 23-25, and jil. iv, figs. 26-2S.] 



Two specimens, a male and a female, from this deep-water fish were collected from a fish taken 

 by the U. S. Fish C'onnnission off the southern coast of New England in 1884. While these specimens 

 re.'^emble Linstow's A. iiiKrniri and still more closely his .1. imirniroidri (Challenger Report, vol. .vxiii, 

 part Lxxi, p. 7, S, pi. i, figs. 10, 11, text figure 1), tliey can not be referred to either. The bodies ai-e 



