1034 MR. R. J. ORTLEPP ON THE 



lai'ge. The stalked papillas are equidistant, two pairs being pre- 

 anal and two pairs post-anal. Of the three pre-anal ventral 

 papillfe, the central one is large, and is situated nearer the rim 

 of the anus than the other two. There are four post-anal sessile 

 papillfe, of which the iirst two pairs are small and arranged in 

 a row immediately behind the anus ; the 3rd pair is slightl}^ 

 obliquely placed just behind the level of the last pair of stalked 

 papilhp ; the 4th pair is at about the middle, and the last pair at 

 the junction of the 2nd and last thirds of the tail. 



The spicules are short and slightly unequal; the right is 385 ^ 

 long by 38 ju, broad at its base, and tapers to a fine point ; the. 

 left is 430 /.{ long bj'' 38 n broad at its base ; its posterior half 

 broadens out to about 74 jx to form a comparatively large spear- 

 head. 



The ventral surface of the tail is traversed by longitudinal 

 rows of irregular tubercles of the same size and shape as those 

 found in P. monodens. 



Host : Colubri, N. 58. Brazil. 



This species appears to be closely allied to Ph. mo7iodens, with 

 which species it agrees in the arrangemeut of the caudal papillae 

 of the male, the general shape of the spicules, markings on the 

 bursa, and size of the eggs, It differs from this species, however, 

 in its larger teeth, more posterior position of the vulval aperture, 

 shorter oesopliagus and larger receptacula seminis. 



Von Drasche (1883) states that the inner teeth are very small ; 

 my observations showed that they were in nearly all cases of the 

 same size as the outer teeth, and could be easily seen from either 

 lateral ar ventral (dorsal) views of the lips, 



(11) Physaloptera bon]^ei, sp. n. (Text-figs. 16 & 17.) 



The material consisted of four females and two males, collected 

 from a " Sapakara," Dutch Guiana ; the females varied in length 

 from 41 to 50 mm., and the males are respectively 26 and 33 mm. 

 long. 



The cuticle is transversely striated, the .striae being about 

 /.1 4 apart. In addition there is a very distinct and coa,rse 

 ringing.. It is only very slightly reflected over the base of the 

 lips. 



The cervical papillse are situated some distance behind the 

 junction of the two oesophageal parts, this distance being about 

 half the length of the ml^scu]a.r oesophagus. The excretory duct 

 opens to the exterior about 150 /i further back. 



The lips are somewhat flattened, and each has two outer 

 j)apill£B. Only two teeth are present on each lip, an outer and 

 an inner median tooth. They are of the same size, the outer 

 being conical and obtuse, whereas the inner is membranous and 

 tripartite. 



The muscular oesophagus is only slightly thinner than the 

 glandular, and the nerve ring is situated at the junction of its 



