Helminth Fauna of the Dry Tortugas. 65 



Body elongated, cylindrical; color somewhat variable, but in most 

 cases tinged with red in the middle portions; the intestines dark brown, 

 nearly linear in middle region but tapering gradually to the posterior 

 end; neck short; head with short, conical projection in front of oral 

 sucker; ventral sucker about twice oral; pharynx subglobular, contig- 

 uous with oral sucker, its lumen quadrangular; esophagus short; intes- 

 tinal rami ample, sacculate, extending to the posterior end, in my speci- 

 mens filled with black, granular material. Genital aperture median, 

 ventral to pharynx; cirrus short; prostate large, its tube much convo- 

 luted ; in my specimens the prostate begins at the anterior edge of the 

 ventral sucker and extends to the posterior edge ; seminal vesicle behind 

 ventral sucker. Testes 2, near posterior edge of ventral sucker, slightly 

 diagonally placed; ovary subglobular or oval, a short distance behind 

 testes; seminal receptacle behind ovary and close to it; vitelline glands 

 tubular, lateral, beginning a short distance in front of ovary and con- 

 tinuing for a short distance back of the seminal receptacle ; uterus volu- 

 minous, mainly dorsal and median, from level of testes back rather more 

 than half-way from the ventral sucker to the posterior end; ova very 

 numerous and minute. The metraterm joins the duct of the prostate 

 at base of the retracted cirrus in a specimen studied in sections (fig. 152). 

 Excretory vessel single, from posterior end to a point a short distance 

 behind seminal vesicle, where it divides into two lateral branches which 

 unite above oral sucker. The cells lining the excretory vessel near pos- 

 terior end appear to be ciliated. Length 5 to 25 mm. ; diameter 1 to 2 mm. 



Host, Lycodontis moringa: 1907, June 30, 1 fish, 1 distome. 



This distome was translucent greenish- white, intestines black. Neck 

 actively contractile, body less so. There were a few, low, fleshy papillae 

 scattered over the surface of the body. 



Dimensions, life: Length 5.5; breadth 0.98; oral sucker 0.42; phar- 

 ynx 0.28; ventral sucker 0.84; neck, extended, length 1.40, breadth 0.35. 

 Ova, balsam, 0.018 by 0.010. 



1907, July 2, 1 fish, 1 and fragment. 



Suckers transparent greenish, from ventral sucker to posterior yel- 

 lowish, due to ova, posterior third very dark; length 25 mm. 



Host, Lycodontis funebris: 



1906, July 4, 1 fish, 3 distomes in stomach, 1 in intestine. 



Middle of body tinged with red, anterior end translucent whitish or 

 greenish-yellow; intestines conspicuous, black; length of largest 22; 

 diameter 1.5 to 2; oral sucker 0.98; pharynx 0.42; ventral sucker 1.92. 

 Ova, balsam, 0.017 by 0.010. 



1907, June 28, 2 fish, 2 distomes, in stomach, 8 and 16 mm. long. 



1908, Julv 7, 1 fish, 3 distomes. 



Length 15 and 18 mm. respectively. General ground-color reddish, 

 especially in the middle third, growing paler toward the posterior end 

 and becoming translucent anteriorly in the vicinity of the suckers ; intes- 

 tines black, conspicuous the entire length. 



Hapladena varia gen. et sp. nov. (Figs. 156, 157.) 

 Etymology: &TtX6o^ 1 single; Myv t gland. 



Body, especially anteriorly, covered with dense, short, flat spines; 

 shape variable, fusiform to linear; suckers nearly equal and not far apart; 

 5 



