84 Papers from the Marine Biological Laboratory at Tortugas. 



then along the right side of the uterus to the testis (fig. 231 vd). A short 

 distance in front of the seminal vesicle there is another seminal reservoir, 

 which I take to be a seminal receptacle (fig. 231 sr). Along its median 

 side a yolk-duct was seen, and a short distance in front and near the 

 right side a small, deeply-staining lobed organ which appears to be the 

 ovary. Concerning the limits of the other organs I am not quite certain. 

 The vitelline glands appear to fill the greater part of the anterior half 

 of the middle region of the body around the intestinal rami and with a 

 greater dorsal than ventral distribution and are also distributed periph- 

 erally over the testes. The testes, while not altogether satisfactorily 

 determined, appear to be diffuse organs lying ventrally in front of the 

 folds of the uterus, extending laterally to the lateral nerves and forward 

 between the posterior intestinal rami. The uterus is conspicuous and 

 fills up the greater part of the posterior third of the body. 



Host, Kyphosus sectatrix: July 16, 1907, 1 fish, few trematodes. 



The longest specimen measured 4 mm. Dimensions of a smaller 

 specimen, life: Length 2.24; breadth 0.77 ; diameter of mouth 0.06; ova, 

 somewhat variable, 0.022 by 0.013. 



