1040 



MR. R. J. ORTLEPP ON THE 



and one pair post-anal ; the 1st pair is more ventral in origin 

 than the others, and is also closely approximated to the 2nd 

 pair ; the remaining pairs are equidistant from each other. 

 There are three pre-anal and four pairs of post-anal ventral 

 papilla ; the 1st pair of post-anal papillje are situated immediately 

 behind the anus, the 2nd and 3rd pairs are near together just 

 behind the middle of the tail, and the last pair midway between 

 the 3rd pair and the tip of the tail. 



The spicules are unequal, the right being short and stout, 

 measuring 105 /x long by 23 ^u broad, the left being slender, 

 measuring 273 u long by 7 /x broad at its base ; the right spicule 

 tapers to an obtuse point, whereas that of the left side forms a 

 very fine point. 



Host: "Lizard.''" Uganda. 



Types in the Helminthological Department of the London 

 School of Tropical Medicine. 



Text-fig-ure 19. 



Fhysaloptera gracilis, sp. n. 

 A = Cephalic extremity, lateral view. B = Ventral view of lips. 

 C = Inner view of lip. D = Caudal extremity of male. 



Bisctcssion.— The arrangement of the bursal papillae in the 

 male, the absence of cuticular markings on the greater part of 

 ventral surface of the caudal extremity of the male, and the 

 character of the lips and its teeth — each of these distingxiish this 

 species from all the other reptilian didelphoid forms. 



There is some similarity in the arrangement of the bursal 

 papillas of this species to that found in F/i. leptosoma (Gervais), 

 Seurat, 1917, except that just behind the anus there are two 

 pairs in this latter species instead of one. Ph. gracilis, however, 

 is easily distinguished from this species by the additional 

 characters of a more elongate body and of much shoi'ter spicules. 



