NEMATODE GENUS PHYSALOPTERA. 1083 



symmetrical, far posterior to end of muscular oesophagus and 

 just in front of excretory pore. External tooth conical, slightly 

 shorter than the internal tooth. 



Yulva may be found behind oesophagus, but generally it opens 

 in front of its posterior termination, even so far forwards as its 

 middle. Two uteri arise directly from base of egg-chamber. 

 Receptaculum seminis shoi't and ovoid, not constricted off from 

 the uterus. 



Egg ? Tail short, digitiform, with rounded tip. 



Body of male smaller and slenderer than that of female. Bursa 

 ornamented with spines. Three large papillae just in front of 

 anus ; 3rd pair of post-anal papilloe at the level of the 5th pair of 

 external papillse. 



Spicules unequal, right larger and shorter with bent tip, left 

 slenderer and straight. 350 and 480 [x long respectively. 



Host : Mus rccttus. Stomach. Moi-occo. 



(35) Physaloptera brevivaginata Seurat, 1917. 



Only immature female known ; 9*8 mm. long x 444 /x thick. 



External tooth strongly chitinised with broad base (surbaissee) 

 and bent outwards. Internal tooth tripartite, and higher than 

 the external tooth ; its middle part is bicuspid. Two papilla; to 

 each lip. (Esophagus l/4th, tail l/35th of body-length ; tail has 

 a rounded tip, and the caudal pores are in its posterior third. 



Vulva immediately in front of middle of body, 2*3 mm. from 

 anterior extremity. Vagina very short, 300 yu, long ; egg-chamber 

 600 /x long, and its posterior end passes directly into the two 

 uteri. 



Host : Vespertilio kuhlii. Stomach. Bou-Saada. 



(36) Physaloptera alata, var. chevreuxi Seurat, 1914 



Has same character as Ph. cdata ; differs by its smaller size and 

 very posterior position of the cervical papillae and excretory pore. 



Mcde 7 mm. longx515/x, thick. Muscular oesophagus 260 //,. 

 (Esophagus l/4th of body-length. Cervical papilla 370 and 360 /x 

 from anterior end ; excretory pore 384 ya. 



Female (immature). Length 8 mm.; tail long (310 /x) and 

 conical. Vulva a short distance behind end of oesophagus. 



Host : Hawk, Bone. 



(37) Physaloptera alata, var. nouveli Seurat, 1915. 



Large nematodes with robust body and regularly attenuated 

 anteriorly. Cervical papillae subsymmetrical, situated more or 

 less at the level of the hind end of the muscular oesophagus. Two 

 lateral lips, each with a large triangular external and pointed 

 tooth, and a very small internal tooth with three tips. (Eso- 

 phagus short, l/6th of body-length. 



Male. Length 22-28*5 mm. x 900 /a thick. Tail conical and 

 slender, 1-165 mm. long. Circumcloacal area covered with small 



