Helminth Fauna of the Dry Tortugas. 63 



side. The seminal receptacle is oval, behind the ovary and dorsal to and 

 touching the vitelline glands; uterus in many folds in the mid-region 

 of the body, extending from the caudal end of the body proper to the 

 ventral sucker. The metraterm enters the cirrus-pouch (figs. 146, 147). 

 Excretory vessel voluminous and thick-walled in the appendix, passing 

 as a single vessel to the caudal border of the ventral sucker, where it 

 divides into 2 lateral vessels. These lateral branches unite dorsal to the 

 oral sucker. 



Host, ,Lycodontis moringa: 



1906, July 4, I fish, 4 distomes, in stomach. 



1907, July 2, I fish, I distome; July 11, i fish, 3 distomes. 

 Dimensions, life: Length 3.50; breadth 0.91; oral sucker 0.25; 



pharynx 0.07 ; ventral sucker 0.56 ; ova 0.018 by 0.009. 

 Host, Lycodontis funebris: 



1906, July 4, I fish, i5o±distomes, stomach. 



1907, June 28, 2 fish, 82 distomes, stomach. 



When placed in sea-water these distomes adhere strongly to each 

 other and to individuals of other species. 



Dimensions, life: Length 3.5; breadth, anterior 0.28, middle 0.90, 

 posterior 0.28; oral sucker 0.22; pharynx 0.07; ventral sucker 0.50; ova 

 0.02 by o.oi. 



Mature and immature occurred together in these lots. 



Ectenurus virgula sp. nov. (Fig. X48.) 



This species, according to Pratt's Synopsis, belongs to the genus 

 Lecithocladium. When one attempts to give it a place among the nu- 

 merous genera established by Looss (Beitrag zu Syst. d. Dist.) it must be 

 placed in or near the genus Ectenurus, on account of the 2 lateral emi- 

 nences (fig. 148 n) situated on the dorsal side of the neck above the 

 pharynx. 



The following description is based on specimens mounted in balsam: 

 Body cylindrical to fusiform with transverse rings making a sharp 

 serrate outline which is most conspicuous on the ventral side, where 

 it continues caudad to about the base of the appendix, very faint on 

 the dorsal side; appendix approximately one-third of the entire length; 

 neck short, its diameter much less than that of the body, with 2 slight 

 eminences dorsal to pharynx; ventral sucker prominent, 2.5 times the 

 diameter of the oral sucker; pharynx subglobular, adjacent to oral 

 sucker; raini of intestine extend into the appendix. Genital aperture 

 ventral, median, at posterior margin of oral sucker; cirrus slender, about 

 as long as the diameter of the ventral sucker ; cirrus-pouch dorsal to ven- 

 tral sucker, prostatic portion rather small and inconspicuous, somewhat 

 variable in position but always behind the ventral sucker, its long axis 

 coinciding nearly with the long axis of the bod}-. Seminal vesicle divided 

 usually into 3 parts, which, in most cases, increase in size posteriorh^ the 

 anterior division ellipsoidal, the others subspherical, the whole vesicle 

 surrounded by a definite muscular wall. There is considerable varia- 

 tion shown by the seminal vesicle. Testes 2, close together, one behind 

 the other, just back of the seminal vesicle and with but a short interval 



