PARASITES OF FISHES OF THE WOODS HOLE REGION. 477 



Antimora viola. 



NEMATODES. 



1. Iniinnlure utmatodes. [PI. xiil, figs. 163-165.] 



Seven specimens from peritoneum; U. S. Fish Commission steamer AU>atro.ss, 811 fathoms. These 

 specimens, which are young ascarids, have tiie body covered with a thin embryonic investment, which 

 is thrown into transverse folds, raised from tlie body, and in places slougliing off. In some of the 

 specimens rudimentary lips can be seen. Dimensions in millimeters: Lengtli, 28; diameter of head 

 0.12, middle 0..5, at anal aperture 0.15; distance of anal aperture from posterior end, 0.15. 



Phycis tenuis. Hake. 



The stomachs examined by me have been empty. The intestines of some alcoholic specimens 

 contained a whitish chyle, which became chalky when <lry and contained a large proportion of 

 carlionate of lime. 



NEM.\TODES. 



1. .UairU sp. [PI. VIII, tigs. 75-78.] 



One specimen, a female, collected l:>y Viiial X. Edwards, November, 1888, appears to he near ,1. 

 ditntta. Some of its dimensions in millimeters are; Length, 84; diameter of head 0.36, 1 mm. back of 

 head 0.65, near middle (maxinnnn) 1.85, 1 mm. from posterior end 1.12, at anal aperture 0.73; distance 

 from anal aperture to |)osterior end 0.37; length of upper lip 0.2S, l)readth 0.26. 



The si)eciinen is attenuate for the anterior third, posterior end coiled; diameter nearly uniform 

 from middle to posterior end. The upper lip is unsymmetrical ami no papill;r were seen on it. No 

 lateral al;e were observed. 



2. Iiiniuilure nematodes {Ascnris). From body cavity. [PI. xiii, figs. 166, 167.] 



.Six lots in the U. S. National Museum collection taken from fish captured off IMarthas Vineyard 

 in connection with work of the U. S. Fish Commission; one lot collected at Woods Hole, .August 

 28, 1889. The specimens are for the most part from the outside of the alimentary canal. The bottles 

 containeil several stomachs an<l intestines and a single specimen was found in one of the stomachs. 

 This was compared with specimens taken from ca|)siiles in the mesentery and found to be identical. 

 Dimensions in millimeters: Length, 21; diameter, head 0.10, near liead 0.3, middle 0.44, near posterior 

 0.3, at anal aperture 0.15; distance anal aperture to posterior end 0.25. The outlines of the young 

 ascaris could Ije made out within the embryonic cuticle. 



3. Filaria sm-nln sp. iiov. [PI. xv, figs. 192-196.] Off Nantucket, 65 fathoms, .Vug. 23, 1883. 



Body armed with circles of short triangular spines. First circle about 0.1 mm. from the anterior 

 end, length of spines 0.01 mm. The circles become rather indistinct back of the eighteenth, but 

 continue until their number is over 100, as could be seen along the margins of optical sections of the 

 worm. The spines Ix'come smaller in the posterior circles. Dimensions of male in millimeters: 

 Length, 5.8; diameter in front <if first circle of spines 0.06, at fir.st circle 0.07, middle 0.1, at anal 

 aperture 0.06; distance of anal aperture from posterior end 0.16; lengths of copulatory spines 0.06 and 

 0.03. Female (s])ecimens not quite comi)lete) : Length, 6.5; diameter at first circle of spines, 0.08; 

 maximum diameter, 0.18; ova, 0.04 and 0.02 nun. in the two jirincipal diameters. In the males the 

 (escjphagus is sinuous and the anterinr end seemed to be inverted. Tin; co])ulat<.)ry siiines ai>e unequal, 

 one being long, slender, and sharp-] lointed; the other shorter, a little broader, appears to be forked at 

 the liase and blunt at the tip. Six postanal and four preanal papilUe were made out on each side. The 

 two posterior papilhe on each side are much smaller than the others and were seen in cmly nne of the 

 specimens. 



The male is further characterized by having four longitudinal, serrate rows of small plates in 

 front of the anal aperture. The length of these rows in one specimen was 0.35 mm. The cnmponent 

 plates 0.001 nun. in height, of varying length; some measured O.OOo in length. 



CESTODES. 



4. Rhi/nrliobotlirhiiii. Cysts on viscera. 4, p. 795. 



