NEMATODE GENUS PHYSALOPTERA. 1045 



The spicules are unequal, pointed, and general!}^ curved. The 

 left spicule appears to vary in length from 1 to 1"2 mm., with a 

 thickness of 32 jj, at its base. The right spicule is slightly 

 stouter than the left ; its length also appears to vary from 840 to 

 900 ^ with a thickness of 38 /x at its base. 



Hosts : I/'elis catus clomesticus. Stomach. Federated Malay 

 States, British and Dutch Guiana, China and 

 Ceylon. 

 Felis nebulosa. India. 

 Felis 23(('i"dus. Stomach. Nigeria. 

 Although my observations as regards the arrangement of the 

 caudal papillae in the male, the position of the vulva in the 

 female, and the size of the eggs diiler considerably from tliose of 

 von Listow, yet I am quite satisfied that my material belongs to 

 the same species. 



Text-figure 22. 



Physalopfera prceputialis v. Linst. 

 Terminal portions of female genitalia. 



The prepuce-like fold of the cuticle over the tail, the rounded 

 wart-like tubercles on the ventral surface of the tail of the male, 

 the nature of the teeth, the presence of a ring round the body in 

 the vulval region of the female, and the fact that his material is 

 described from Felis catus, easily counterbalances the differences 

 in the arrangment of the bursal papillae. Yon Linstow states 

 that this arrangement may be found to be dijQTerent, as he had 

 only one male for examination, and this specimen he found 

 difficult to study. The ventral papillae, according to von Linstow, 

 are three pre-anal, one pair immediately behind the anus, three 

 papillae towards the tail end, and an additional pair slightly in 

 front of these thi'ee. He gives the average length of the female 

 as 30 mm., with the vulva 8 mm. from the cephalic extremity 

 and the eggs as 55 by 33 j.i. 



Pace. ZooL. See— 1922, No. LXX. 70 



