PARASITES OF FISHES OF BEAUFORT, NORTH CAROLINA. 



403 



Chilomycterus schoepfi, Rabbit Fish. 



NEMATODES. 



1. Asearis neglecta Leidy. 



1902. — July 8, 1, female. Body wall of living worm transparent, faintly yellow by transmitted 

 liu'lit, vascular; intestine broad, yellowish; ovary darker; intestine and oesophagus each with a slender 

 diverticulum. Aug. 16, 2. 



TREMATODES. 



2. IHMomum sp. [Fig. 208.] 



1902. — July 5, 2, small, white, subspherical; immature. Intestines voluminous, the bifurcation 

 ventral to posterior half of pharynx, contents of intestine granular. Whole body appears to l>c filled 

 with granular material when moderately compressed. Dimensions, life, moderately compressed, in 

 millimeters: Length 1.06, breadth 0.82; diameter of oral sucker 0.15, ventral sucker 0.17; pharynx, 

 length 0.105, breadth 0.120; orifice of oral sucker, length 0.06, breadth 0.09; ventral sucker, length 

 0.06, breadth 0.06. Both suckers circular. 



1902. — July 22, 1; apparently adult of this species. Dimensions of living specimen in millimeters: 

 Length 2.25, breadth 1.5; diameter, of oral sucker 0.33, of pharynx 0.16, of ventral sucker 0.38; 

 ova (1.072 by 0.043. Aug. 16; 1. This was at first taken to be a Monoslomum, the ventral sucker for 

 some reason being difficult to make out. The diminsions agree with those of the one found on July 

 22. Aug. 26; 3. The body of these specimens is squarish, truncate in front, the oral sucker being 

 sometimes retracted. Testes two, rather large, subspherical near posterior, and in all but one so cli.se 

 together as to appear to be but one. Vitellaria abundant, posterior, lateral and peripheral to oesopha- 

 gus; ovary in front of testes, dorsal. 



Unfortunately the anatomy of these worms is not distinctly shown in the preserved specimens. 

 In one the genital aperture appeared to be a little in front of the ventral sucker to the left of the 

 median line, but was not made out with absolute certainty. In another the cirrus appeared to make 

 a sharp turn dorso-caudad then mediad t.i open in the ventral sucker as in Monostomum. 



Two specimens were cut into serial sections, one transverse, the other sagittal, but the material 

 having been in poor condition when first collected, even with this aid the anatomy was poorly shown. 



In all the specimens the ventral sucker is less distinct than the oral, and the pharynx in all is 

 very distinct. 



COPEPODS. 



3. Cliondracanthus sp. 



These interesting forms, along with other parasitic copepods collected at Beaufort, have been 

 referred to Prof. C. B. Wilson. These were found on the gills, fins, ventral surface of body, and 

 under the eves of their hosts. At the points of attachment the skin was white and opaque, the 

 patches looking somewhat like sporozoa cysts. Length 5.5 mm; length of egg-chains 3 mm. Some 

 of the ova contained nauplii. 



1902.— July 5, 37. July 22, 23. Aug. 13, numerous. Aug. 16, 1. 



