58 DR. H. LYSTER JAMESOX AXD BR. W. NICOLL ON 



only two of the birds examined. It is the adult form depicted by- 

 Jameson (1902, pi. xvi. fig. 11) and to which the greater part of 

 his description (pp. 159-160) applies. 



The body is somewhat flat and oval, with pointed extremities. 

 Its length is •19--25 mm. and its maximum breadth is usually a 

 little more than half the length. The cuticle is entirely covered 

 with minute spines. The oral sucker measures "OSO-'OST mm. in 

 diameter and the ventral sucker •024-"032 mm., the ratio being 

 approximately 6 : 5. The ventral sucker is situated at a distance 

 of "ll— "15 mm. from the anterior end, the distance being about 

 three-fifths of the body-length. 



The pharynx is contiguous with the oral sucker and is about 

 •017 mm. long. It is followed by a narrow oesophagus which may 

 be nearly twice as long as the pharynx. The intestinal diver- 

 ticula diverge fairly widely and barely reach the middle of the 

 body. The excretory vesicle consists of a very wide main stem 

 and two long branches, which nearly reach the oral sucker. 



The testes lie some distance behind the ventral sucker, but 

 nearer it than the end of the body. They are small and irregu- 

 larly globular. The vesicula seminalis is situated over the left 

 side of the ventral sucker, usually a little in front, but sometimes 

 extending to the posterior border of the sucker. From it issues 

 a short pars prostatica, of the usual Gymnophallus type, opening 

 on the anterior lip of the sucker. 



The ovary lies on the right side, on the same level as the 

 ventral sucker, and it is nearly as large as the sucker. The yolk- 

 glands are situated over the anterior half of the A^entral sucker. 

 They are somewhat irregular. The uterus lies almost entirelj' in 

 front of the ventral sucker, and extends forwards almost to the 

 oral sucker, filling up most of the anterior part of the body. The 

 eggs, which usually number 30-100, measure •018-*020 mm. in 

 length and •013-"014 mm. in breadth. 



Gymnophallus affinis, sp. n. (Text-fig. 11.) 



This species, although about the same size as G. oedemice, is at 

 once distinguished from it by the large size of the oral sucker and 

 by the disposition of the uterus. It measures •2-*25 mm. in 

 length and •11--13 mm. in breadth, the body being flat and oval. 

 The ends are not usually so pointed as in the previous species. 



The oral sucker has a transverse diameter of •065--085 mm. 

 The ventral sucker is very much smaller, measuring only '030- 

 •045 mm., and the ratio is usually about 2:1. The ventral sucker 

 is situated "IG-'IS mm. from the anterior end, i. e., a little more 

 than two-thirds of the body-length. 



The pharynx, which is contiguous with the oral sucker, 

 measures •015-018 mm. in length by •012--017 mm. in breadth. 

 It is followed by an oesophagus of about the same length. The 

 intestinal diverticula diverge very widely and are usually much 

 dilated. As a rule, they do not reach the middle of the body 



