NEMATODE GENUS PATSALOPTERA. 1093 



been re-examined, his and Seurat's specimens must be treated as 

 separate species. 



(59) Physaloptera incurva v. Linstow, 1908. 



Length of male 20 mm. by "75 mm. broad; female 47 mm. long 

 by 1"58 mm. thick. 



Two lips, dorsal and ventral ; each with three teeth. 



(Esophagus of male 1/7-6, of female l/8th, tail of male l/22nd, 

 of female 1/2 35th of body-length. 



Male bursa with four stalked papillte — an unpaired pre-anal 

 ventral papilla and thi'ee pairs of equidistant post-anal papillae. 



Spicules unequal, right "36 mm. long and broad, left -57 mm. 

 long and narrow. 



Yulva divides body into ratio of 34 : 59. Eggs 57 x 39 fx. 



Host : Erinaceus frontalis. Stomach and intestine, Kalahari. 



It is doubtful whether von Linstow's observations in connection 

 with the lips are correct. As all the other charactei's are 

 typically those of the genus, it is probable that the lips are 

 lateral in position and not dorsal and ventral. 



(60) Physaloptera ciRCULARis v. Linstow, 1897. 



Length of male 15*2 mm.; length of female 24 mm. by 1"9 mm. 

 thick. 



Two lips, each with two rounded swellings internally, and 

 three external papillae. 



Esophagus of male 1/4*3, tail of male 1/15*4, tail of female 

 1/6 1st of body-length. 



Four pairs of circumcloacal stalked papillas ; one pair of sessile 

 papillae in front of, and an unpaired papilla just behind anus;, 

 three pairs of post-anal ventral papillae, of which pairs 1 and 

 2 are close together at about the junction of the first two. 

 quarters of the tail, and the 3rd at about the middle of the tail. 



Eggs with very thick shells, 49 X 33 /a. 



Host : Mus rattus. Stomach Madagascar. 



It is quite possible that von Linstow missed an unpaired pre- 

 anal sessile papilla and four small sessile papillae just behind the 

 anus. If this should later be found to be the case, then there 

 would be reasonable ground for supposing this species to be 

 either the same as, or very closely related to Ph. mtiris- 

 brasiliensis Dies. 



(61) Physaloptera ruwenzorii Parona, 1907. 



Length of male 9-9g mm., of female 14-17 mm. 



Body attenuated for a short space anteriorly. Large lips with 

 small papillae. Teeth large and conical. (Esophagus l/6th of 

 body-length. 



Male caudal bursa large, with large circular expansion anteriorly 

 and conical terminal portion ; cuticular ornamentations absent ; 



Proc. Zool. Soc— 1922, E'o. LXXIII. 73 



