NO. 1560. PARASITES OF BERMUDA FISHES— LINTON. 119 



Bathy stoma striatum. 



July 17, one. Dimensions, in millimeters, life: Length 1; breadth, 

 anterior 0.22, middle 0.tl:2, posterior 0.15; ova, somewhat variable, 

 largest 0.018 by 0.011. 

 HxritAilon fiavolineat uni. 



July 31, two. Dimensions of larger, in millimeters, life: Length 

 1.05; breadth, anterior 0.12, middle 0.31, posterior 0.12; diameter of 

 oral sucker 0.09, of pharynx 0.03, of genital sucker 0.08; ova 0.018 

 by 0.011. 



GASTEROSTOMUM, species. 



Trematodes belonging to this genus were found on two occasions in 

 the rock fish {Mycteroperca apua), in each case in poor condition. 



The relative position of the vitellaria, ovary, testes, uterus, and 

 cirrus nuich as in G. arcuatu/ji; the vitellaria, however, are more 

 crowded, in some of the specimens at least, than in that species, 

 although agreeing closely in number, 28 having been counted in one 

 and 29 in another. The anterior end is bluntly rounded, and the 

 anterior sucker is relatively large, as in (J. hacnlatum. 



July 21, twenty; length 2 nun., breadth 0.3 mm.; ova 0.021 by (».015 

 and 0.03 by 0,02 mm. July 22, five; no two alike in shape, but gen- 

 erally slender; length 0.66 mm., breadth 0.3 nuu. 



UNDETERMINED TREMATODE. 



Plate XV, tigs. 100-102. 



This is possibly a new genus, related, but not closely, to Pkyllodis- 

 toiiivm. 



Body nearl}' circular, rather thin, with edges folded under. The 

 neck is subcylindrical and sharply marked off from the body. Ven- 

 tral sucker larger than oral, with a nearly circular aperture. Mouth 

 circular, prohal)ly nearly terminal, pharynx not clearly seen and very 

 small, if any. The intestinal rami are simple and elongated, l)eginning 

 near the oral sucker and extending to the posterior end, where, 

 although they were not clearly seen, they appear to meet. The repro- 

 ductive organs, if correctly interpreted, have the following arrange- 

 ment: Testes two, transversel}' placed, not granular, but appearing as 

 crumpled or folded structures; ovary in front of right testis, near it 

 and ventral; vitellaria two, lobed, immediately behind ventral sucker; 

 uterus between and behind testes; genital aperture behind oral sucker 

 at bifurcation of intestine; cirrus and pouch in neck. Ventral disk 

 nearly circular, marked with transverse lines, and minute longitudi- 

 nal striffi between the lines. 



Dimensions, in millimeters, life: Length of disk 0.75, breadth 

 0.93; neck, arched and bent ventrally, diameter 0.42, length, esti- 

 mated, 0.87. Specimen mounted in balsam: Body, length 0.75, 

 breadth 0.90; neck, length 0.75, breadth 0.36; oral sucker, length 



