PARASITES OF FISHES »>F BEAUFORT, NORTH CAROLINA. 



413 



U. Otobothrium crenacolle Linton. 



1901. — Aug. 21, very numerous, cysts in stomach wall. 

 11'. Tetrarhynehus bisulcalus Linton. [Fig. 115.] 



1901. — Aug. 21, cyst containing a mass of hooks only. They doubtless represent the remains of a 

 disintegrated scoles. They agree with this species. There are two bunches of hooks piled together 

 irregularly and inclosed in the same cyst. Dimensions in millimeters: Cyst 0.2 by 0.14; thickness of 

 wall 0.017; length of longest luniks 0.023. Aug. 2'6, scolex from stomach wall. 



1902.— July i:>. 2. July IS, 31, Aug. lit, 20, 21, few. 



13. Synbothrium filicolle Linton. 



I sually in elongated blastocysts inclosed in thin cysts on viscera, especially cm the liver. 

 1902.— July 22, 2. Aug. 16, few. 



TREMATODES. 



14. Distomum monlicellii Linton. 



Idol'. — July 15, 1, immature, but reproductive organs developed sufficiently t<> admit of determina- 

 tion. Excretory vessels filled with orange-colored spherical concretions, as in No. 9 under Ceiitni/n-ixti:.* 

 striatus. 



15. Distomum vitello&um Linton. 

 1902.— Aug. is, l. 



16. Distomum pudens Linton. 



1!(02. — July 1-1. 1; length 1.42 mm.; ova 0.07 by 0.04 mm. Specimen in poor condition. 



17. Distomum sp. 



1902.— Aug. 8, 1; length 1 mm.; ova 0.04 by 0.02 mm., conical. 



See No. 10 under Rachyceniron canadus. [Fig. 171.] 

 Is. Distomum dentatum Linton. 



1901. — Aug. 3, 1; agrees closely with this species, but oral spines missing. The cirrus was spinose 

 and lay for the most part behind the ventral sucker, and rather to the right instead of the left of that 

 organ. Dimensions in millimeters: Length 2; diameter of oral sucker 0.21, of pharynx 0. 15, of ventral 

 sucker 0.23; ova 0.065 and 0.037 in the two principal diameters. Aug. 6, 2, in poor condition; the 

 oral spines were missing; otherwise in agreement with this species. Aug. 13, 1. Aug. 16, 12; 1 

 specimen without ova resembles the distome from the scup described in Bulletin of the 1". 8. Fish 

 Commission for 1899, page 296, pi, xxxix, fig. 72. Aug. 20, numerous, 75 counted. In this lot there 

 was a great variety both of form and size. The larger specimens were yellowish-white, thickish and 

 nearly opaque; the smaller specimens more slender than the larger ones, bluish-white and translucent. 

 These two forms appear, however, to be specifically identical. The oral spines, characteristic of the 

 species, are present in the thick opaque specimens, while they appear to be absent from the translucent 

 worms. The latter, indeed, seem to be in poor condition, fragile and degenerate. Cirrus in both 

 kinds armed with minute spines; seen in dorsal view it passes dorsal to the ventral sucker near the 



right edge of the. latter organ in oi f the larger opaque individuals, more nearly median in one of 



the translucent worms. In another larger specimen the cirrus lay to the right of the ventral sucker, 

 the spinous portion being in front of the sucker. 



Forms resembling Distomum sp.. Bulletin of the U. S. Fish Commission for 1899, page 296, tigs. 

 72-74, occur in this lot. Dimensions of 4 specimens in millimeters: 



Length 



Diameter of oral sucker . . . 



Length of pharynx 



Breadth of pharynx 



Dtameterof ventral sucker 

 Maximum breadth of bodv 



Ova about same size in all, viz, 0.07 mm. and 0.04 mm. (maximum) in the two principal diameters. 



1901. — Aug. 21, numerous, spined and spineless forms as in foregoing lot. Tin' spines were larger 

 in this lot than in former lots, and were imbricated on the anterior part of the body. There were 

 twenty-four spines in each of the ci immoral circles. Length of spines on neck 0.02 mm., of longest oral 

 spines 0.06 mm., of spines on cirrus 0.01 nun. Aug. 26, several. 



