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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



of the anterior sucker and close behind the bifurcation of the in- 

 testine. The pharynx is relatively small, about as broad as long. 

 It was not clearly shown in the whole mounts ; in sections the length 

 was 0.075 mm., breadth, 0.06 mm. There appears to be a short 

 esophagus in some of the mounted specimens, while in others it is 

 indistinguishable. The intestines could not be traced in whole 

 mounts, but in sections the two rami are seen to unite at the end of 

 the body proper, and to continue as a single tube in the posterior 

 sucker-bearing portion. The cirrus is dorsal to the anterior end of 

 the uterus and enters the genital cloaca in front of the uterus. The 

 testes are numerous and occupy the midregion of the posterior third 

 of the body proper behind the ovary. The vas deferens is dorsal to 

 the uterus. The ovary, at the center of the body, is longer than broad 

 on right of median line and appears to be slightly lobed on its 

 lateral margin. It was not clearly outlined in any of the mounted 

 specimens. The vitelline reservoir is conspicuous. It is ventrally 

 placed and is somewhat triangular in outline. It receives a duct 

 from each side at its anterior angles and sends a short duct to the 

 shell gland from its posterior angle. The vitellaria are diffuse and 

 fill the lateral regions of the body from a little way back of the level 

 of the genital pore and in large degree conceal the other genitalia. 

 They extend into the sucker-bearing portion nearly to the terminal 

 suckers. The uterus passes forward on the ventral side of the vas 

 deferens to the genital pore. Ova were present in the uterus of each 

 of the six mounted specimens, from 4 to 37, with an average of about 

 18. They are more or less oval-elliptical in outline with an elongated 

 filament at each end; about 0.13 by 0.53 mm., exclusive of filaments. 

 The division between the right and left vitellaria is narrow in front 

 of the space occupied by the ovary, shell gland, and vitelline reser- 

 voir. The vitellaria overlap the testes and part of the ovary. 



Table 4. — Measurements of six specimens of Onchocotyle mavori in talsam 



Measurement 



Length of body proper 



Length of sucker-bearing portion.. 



Diameter anterior sucker 



Maximum diameter of body 



Diameter larger posterior suckers.. 

 Posterior terminal sucker, length.. 

 Posterior terminal sucker, breadth 



Mm. 



4.83 



2.10 



.35 



1.12 



.45 



.21 



.14 



Mm. 



4.69 



2.10 



.35 



1.08 



.42 



.21 



.14 



Mm. 

 4.55 

 2.17 

 .38 

 1.06 

 .42 

 .22 

 .14 



Mm. 

 4.42 

 2.31 

 .38 

 .92 

 .42 

 .21 

 .10 



Mm. 

 4.34 

 2.45 

 .36 

 .84 

 .49 

 .21 

 .14 



Mm. 

 3.78 

 2.10 

 .35 

 .68 

 .35 

 .21 

 .14 



A specimen in glycerin measured 5 mm. in length, 1.14 mm. in 

 maximum breadth ; breadth of anterior sucker, 0.42 mm. ; diameter of 

 pharynx, 0.09 mm. Measurements of specimen in alcohol: Length, 



