BY T. HARVEY JOHNSTON, M.A., D.Su., F.L.b. 81 



The mouth is borne on a small, projecting ring well 

 marked off from the rest of the body. The pharynx, in- 

 cluding the gizzard, has a length of .50 mm. Just prior 

 to entering the latter, it narrows somewhat. The p}Ti- 

 form gizzard has a diameter of .09 mm, and is marked off 

 from the rest of the pharynx by a constriction. The 

 intestine is wide and croplike in its anterior portion, with a 

 diameter of .15 mm, soon becoming narrowed to about 

 half this. The nerve ring hes at .2 mm behind the mouth, 

 while the excretory pore is situated in the region of the 

 gizzard at about .4 mm behind the mouth. The short 

 common excretory duct has a somewhat sinuous course. 



The ovary can be traced from the dorsal region near 

 the anus, where it may form a loop, forwards almost to the 

 gizzard. Here it turns back almost to the anus in a more 

 ventral position than before. Fertilisation occurs in this 

 region and the duct travels anteriorh' as a wide uterus 

 crowded with eggs, commonly arranged in two rows, 

 terminating at the female genital pore, which, as already 

 stated, lies on an eminence. Ripe eggs measure about .08 

 by .05 mm. 



Male : — The male is very small, measuring from 

 .97 to 1.17 mm. in length, the maximum breadth being 

 about .09 mm. (Figs. 4, 6, 7.) The anus projects strongly, 

 and behind it the body is narrowed rapidly to form a short 

 tail .06 mm long, whose anterior half is much broader than 

 the posterior half. The latter terminates in a fine point. 

 The former is arched dorsally and at its junction with the 

 posterior part is a pair of tail papillae. At each 

 side of the hind portion of body is a prominent ala, 

 which, just in front of the anal region, is somewhat arched 

 and expanded. It becomes narrowed and then again 

 widened to form a rather thin rounded lobe l\ang above the 

 anus and terminating at the base of the tail. The nerve 

 ring is situated at about .09 mm, and the excretory aper- 

 ture at about .17 mm from the anterior end. The testis 

 IS relatively large. The male spiculum measures .045 mm 

 and is clubshaped and slightly curved, its point being 

 sharp. There appear to be a pair of small papillae 

 in the neighbourhood of the anus. 



