PARASITES OF FISHES OF THE WOODS HOLE REGION. 441 



posterior end 0.069; ova, 0.021 and 0.010 iu the two principal diametert*. The entire body is covered 

 with spine.*:; tlio.se on the neck are sharp-pointed and triangular; on the body they are smaller and 

 more slender; atthe posterior end of the body they are minute. The cirrus is armed with comparatively 

 coarse spines; cirrus pouch elongate. Vitellaria in mounted specimens appear to be two snbglobular 

 masses of coarsely polygonal granules, lying donsal and a little posterior to the acetabiihiiii; testes and 

 ovary not distinctly shown in the specimens, but evidently all near the vitellaria. 



Salmo salar, Suhnnn. 



NEM.ATODES. 



1. Immature nematodes (Asc'iris). [PI. \i, fig. 131.] 



U. S. National Museum collection; Bucksport, ile., Mr. Atkins, collector. Two nematodes, 

 e\adeufly from capsules. Head with three lobes, body narrowing uniformly but slightly to each end; 

 tail with a minute mucronate tip. Dimensions in millimeters: Lengtli, 20; diameter, maxinuim 0.4, 

 at anal aperture 0.14; distance of anal aperture from posterior end, 0.13; length of the other speci- 

 men, 24; diameter, 0.5. Fig. 90, sketched from a specimen from Muslelus, would also answer for these 

 forms. 



Salvelinus foutinalis, Brook Trout. 



XE.MATODES. 



1. Ciicullanus elegans Zeder. 



U. 8. National Museum collection; 5 ccjllected by Dr. Robert F. Morris; locality nut given. 

 Female — length, 18 mm.; diameter, 0.45 mm. Male — length, 1.5 mm.; diameter, 0.2.5 mm. Ova, 

 oblong-elliptical, 0.04 mm. and 0.02 mm. in the two principal diameters. A characteristic feature of 

 these worms was the strongly marked longitudinal striations. 



Osmerus niordax, ,Smrlt. 



NEM.^TODES. 



1. Ascaris gp. Immature. 



U. S. National Museum collecti(jn; 3 collected February 2, 1882; locality ni:>t given. Head with 

 three rudimentary lobes; tail minutely mucronate. Dimensions of one of the largest in millimeters: 

 Length, 41; diameter of head 0.3, middle 0.9, at anal aperture 0.23; distance of anal aperture from 

 anterior end, O.IS. Fig. !I0, from }fii>tiifi{!<, and fig. 131, from Si/mo, will also answer for these forms. 



CESTODES. 



2. Dibotjiriiirn liyuhi Donnadieu. 5, p. 438. 



Fundulus heteroclitus, Mumuii'-lioy. 



The following fish from Waquoit Bay were examined in 1899: August 7; 2(i. Alimentary canals 

 tilled with green mud, consisting of a variety of vegetable debris, enormous numbers of diatoms, and 

 foraniinifers in considerable number. .August 28; 22. Alimentary canals tilled with vegetable material 

 (eelgra.ss, etc.). A specimen from Katama Bay, August 28, 1900, had shrimji and other small cru.«taceans 

 in the alimentary tract. 



NEMATODES. 



1. Curnlhmu.^ sp. [PI. XVII, figs. 207, 208.] Aug. 28, 1899; a few small adults from intestine. 



Measurements in millimeters: Length of male, 3.() (alcoholic), female 4.8 (life), latter with ova 

 segmenting in uterus near genital opening. Dimensions of female, life: Length, 4.8; diameter, anterior 

 0.11, middle 0.17, posterior at anal aperture 0.09; length of oesophagus, 0.56; diameter of te.^ophagus, 

 anterior 0.11, middle 0.07, near posterior 0.12, narrowing to 0.07; distance from anterior end to nerve 

 ring, 0.21; <listance of anal aperture from posterior end, 0.19; ova, 0.075 and 0.048 in the two principal 

 diameters. Reproductive a)ierture 2 mm. from posterior end. 



2. Iiiimdtiire iiemutodes {AsciirlK). Aug. 7, 1899; few. 



