NEMATODE GENUS PHYSALOPTERA. 1089 



subequal and weakly chitinisecl, 430 to 520 /x long. Anns about 

 2 to 4 mm. from the caudal extremity. 



Host: Agoitti paca. Stomach. Bahia, Brazil. 

 Discussion. — This species appears to be very closely related to 

 Ph. dilatata Rud., 1819, the only notable difference being the 

 position of 3rd, 4th, and 5th pairs of ventral post-anal papillaa in 

 the male. In PJi. ton^esi these are equidistant from each other, 

 and are situated in the anterior half of the tail, the distance 

 between the 2nd and 3rd pairs being small ; in Ph. dilatata the 

 distances between the 2nd and 3rd, 3rd and 4th pairs are about 

 equal and long, while that between the 4th and 5th pairs is only 

 about half this distance. 



Travassos describes and figures five external papillae to each lip, 

 but I very much doubt whether his observation is connect, as in 

 all the species of this genus examined by me I have never seen 

 more than two ; he also mentions the presence of five similar 

 papillre in his description of Ph. tunjida, but, having re-examined 

 my specimens of this species, I still maintain that only two 

 external papillce are present. 



There seem to be some inaccuracies or misprints in Travassos' 

 description of this species. He writes " ovejector com vagina 

 claviforme longa de cerca de 46 mm. de comprimento." I think 

 this should be 4"6 mm., as it is hardly likely that this organ would 

 be about half the length of the worm. Further, with regard to 

 the ventral pre-anal papillse of the male, the description reads " 3 

 pares situados imediatamente acima do anus." As he figures the 

 usual three papillce in front of the anus, I think this sentence is 

 intended to convey the fact that three papillse, not three pairs, are 

 situated in this position. Because of this error, the number of 

 paired papillae is given as 12 instead of 10 pairs in addition to an 

 unpaired papilla. 



With reference to the position of the anus in the male, the 

 description reads that it is " a cerca de 2, a 4 mm. da estremidade 

 posterior."' In his French translation this sentence is rendered 

 "a environ 2*4 mm. de Textremite posterieure." I am accepting 

 the original to be what Travassos meant, although from the 

 construction of the two sentences it would appear that the 

 tratislation probably describes the true state of affairs. 



It is not perhaps out of place here to draw the attention of those 

 consulting Travassos' original description of this species to the 

 fact that the French translation does not always give a correct 

 rendering of the Portuguese text. 



Forms with imdetermined number of uteri. 



(48) Physaloptep.a caucasica v. Linstow, 1902. 



Male 14-22 mm. longx '71 mm. broad ; female 27 mm. long by 

 l'14mm. thick. 



Cuticle unringed. Lips with four submedian papillas, and laroe 

 cone-shaped external teeth. (Esophagus l/5th of body-length. 



