ABT.i TKEMATODE PARASITES OF BIRDS LINTON 21 



and the seminal vesicle. There is a small seminal receptacle at the 

 postero-median edge of the ovary. The vitelline glands are at the 

 postero-lateral margins of the body. They are somewhat irregular 

 in outline, rather compact, the length of each a little less than half 

 th& length of the post-acetabular region. The uterus occupies prac- 

 tically all the space in front of the testes and vitellaria as far as the 

 level of the anterior border of the ventral sucker, except what is taken 

 up by the ovary and seminal vessels. The ova, which fill this space, 

 are golden yellow, except in the vicinity of the ovary, where they are 

 thin-shelled, and have taken the stain. The mass of ova prevents 

 the making out of further details of structure. 



Dimensions of larger specimen, life : Length 0.75 mm. ; maximum 

 breadth 0.34; breadth of oral sucker 0.051, of ventral sucker 0.054; 

 pharynx, length 0.05, breadth 0.03; ova 0.02 by 0.01. 



Dimensions in balsam : Length 0.67 ; maximum breadth 0.32 ; oral 

 sucker, length 0.03, breadth 0.04; pharynx, length 0.030, breadth 

 0.027 ; ventral sucker, length 0.036, breadth 0.045 ; prepharynx, length 

 0.09, breadth 0.03 ; esophagus, length 0.075, breadth 0.012 ; testes 0.096 

 by 0.054 and 0.090 by 0.045; ovary, length 0.072, breadth 0.063; ova 

 0.020 by 0.012. 



Type.— Cat No. 7940, U.S.N.M. 



LEVINSENIELLA ADUNCA (Linton) 



Figure 51 



1905. Distmnum adwicum Linton, Bull. U. S. Bureau of Fisheries, vol. 24, p. 

 409, figs. 195-197, intestine of Opsanus tau. 



Following are a few details, mainly from notes made at the time of 

 collecting, of a small distome from the intestine of a Sanderling 

 {Grocethia alba) shot near Cape Lookout, N. C, by Dr. John D. 

 Milligan of the steamer Fish Hawk., August 15, 1902. It was noted 

 that the distome appeared to be identical with a species found in the 

 toad fish {Opsanus tau), at Beaufort, N. C. The specimen had lain 

 in sea water over night before it was examined and the ventral 

 and genital suckers were rather faintly shown. 



Dimensions in sea water, compressed: Length 0.8 mm.; breadth, 

 anterior 0.09, at posterior third, maximum, 0.35; diameter of oral 

 sucker 0.06, of pharynx 0.04, of ventral sucker 0.05, of genital sucker 

 0.056; ova 0.018 by 0.012. 



An examination of the stained specimen showed the testes and 

 vitellaria, and they were added to the sketch which had been made of 

 the worm while it was in sea water. The mounted specimen is in poor 

 condition, and but little of the anatomy is shown. (Cat. No. 7941, 

 U.S.N.M.) 



