142 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



1.4 mm. One of the tubular vitellaria extends about 0.5 mm. into the 

 appendix, and the folds of the uterus reach to within 0.6 mm. of the 

 posterior end; ova, 0.013 by 0.009 mm. All measurements made on 

 specimen mounted in balsam. 



A fragment, from harvestfish, collected August 7, 1908 : Posterior 

 end, containing the ovary, vitellaria and folds of the uterus crowded 

 with ova. Length, 2.10 mm.; diameter, 0.77 mm.; ova, 0.015 by 

 0.009 mm. Two larval dibothria had penetrated the fragment, 

 length of each 1.20 mm., breadth, 0.19 mm. 



Genus ECTENURUS Looss, 1907 

 ECTENURUS VIRGULA Linton 



Plate 8, Figure 78 



Ectenurus virgula Linton, Carnegie Inst. Washington Publ. 133, pp. 63, 64, 

 fig. 148 (from Clupanodon pseudoMspanicus, Tortugas, Fla.), 1910. 



A distome (U.S.N.M. No. 8373), collected August 17, 1913, from 

 Trachurops crumenophthalma, is in close agreement with distomes 

 from the Spanish sardine, collected at the Dry Tortugas. The nuchal 

 eminence, which characterizes Looss's genus Ectenurus, cannot be 

 distinguished, but neither can it be seen in some of the Tortugas 

 specimens. 



The body is transversely striate with sharply and rather coarsely 

 serrate margins. The diameter of the ventral sucker is about three 

 times that of the oral; pharynx subglobular. The neck is much 

 contracted, and the appendix is retracted. The genital aperture is 

 at the ventral margin of the oral sucker; cirrus pouch slender; 

 seminal vessicle divided into three compartments, one following the 

 other, and increasing slightly in size posteriorly, dorsal and poste- 

 rior to ventral sucker. The two testes lie near the posterior border 

 of the ventral sucker and are diagonally placed. The right testis is 

 close to the border of the sucker, and the left is contiguous to the 

 posteroventral surface of the posterior division of the seminal 

 vesicle. The ovary is larger than the testes and is contiguous to 

 the posterior border of the left testis. Length of first testis, 0.08 

 mm., breadth, 0.12 mm.; length of second testis, 0.08 mm., breadth, 

 0.15 mm.; length of ovary, 0.15 mm., breadth, 0.19 mm. Vitellaria 

 tubular, on right, left, and posterior sides of the ovary. The folds 

 of the uterus are mainly behind the ovary and vitellaria, filling the 

 space between the vitellaria and the base of the appendix. The 

 ova are small, collapsed, and crowded, and difficult to measure ; about 

 0.016 by 0. 008 mm. 



Measurements in balsam: Length, 1.4 mm.; breadth, 0.43 mm.; 

 diameter of oral sucker, 0.11 mm., of pharynx, 0.07 mm., of ventral 

 sucker, 0.30 mm. 



