32 



PROCEEDINGS OF THE NATIONAL MUSEUM 



torted duct, and proceeds antero-ventrad to the postero-dorsal 

 border of the ovary, where it turns caudad, and appears to join the 

 germ duct. The germ duct lies along the dorsal side of the first 

 testis. It enters the shell gland, where, near the middle of the in- 

 tertesticular space, it becomes the rather thick-walled ootype. The 

 short duct from the yolk reservoir joins it just before it expands into 

 the ootype. The shell gland is relatively large and lies on the left 

 side of the intertesticular space. Beyond the ootype the uterus is at 

 first rather thick-walled and contracted. It then enlarges, becomes 

 thin-walled, and lies in a number of folds between the testes on the 

 right side. These folds were, in most cases, filled with sperm. The 

 uterus passes along the ventral side of the first testis and continues 

 forward to a point near the constriction between the two divisions of 

 the body, where it turns abruptly, and, returning to the posterior 

 end of the body, opens into the ejaculatory duct near the genital 

 pore. 



Lams argentatus. 

 1915, September 1. 



1916, January 8. 



Larus atricilla. 

 1911, July 



19. 



EECOBD OF COLLECTIO^■S 



1 ; length 6.5 mm. ; diameter, anterior division of 

 body 1.35, posterior 1; anterior portion 

 orange color, posterior yellowish. (Cat. No. 

 Y951, U.S.N.M.) 



3 ; length of longest about 6 mm. ; diameter 0.75 ; 

 anterior yellowish, posterior dark bluish- 

 grey. Dimensions, balsam: Length 9.38 

 mm. ; diameter, anterior 1.36, at level of 

 testes 1.40; ova, longer diameter from 0.096 

 to 0.108, shorter diameter from 0.063 to 0.075, 

 average 0.10 bv 0.07. Measurements made 

 from series of sagittal sections: Oral sucker 

 0.09; pharynx, length 0.075, breadth 0.09; 

 ventral sucker, length 0.135, breadth 0.084; 

 ova, average, 0.111 by 0.063. 



1; white, anterior portion tinged with orange. 

 Dimensions, balsam, lateral view: Length 

 6.16 mm. ; diameter, anterior, 0.65, at level 

 of testes 0.77; oral sucker, length 0.090, 

 breadth 0.075 ; pharynx, length 0.070, breadth 

 0.075; ventral sucker, length 0.112, breadth 

 0.089; ova, average of 6, 0.115 by 0.072. 

 (Cat. No. 7952, U.S.N.M.) 



