NEMATODE GENUS PHYSALOPXEEA. 1065 



explains this absence by supposing that von Linstow was exam- 

 ining immature material, as he (Seurat) had in his possession 

 immature specimens of Ph. alata in which the caudal alse were 

 also absent. Unfortunately, I have not in my collection any 

 Physaloptera in this condition, and consequently I accept Seurat's 

 interpretation. 



There is, however, another difference between von Linstow's 

 observations and mine; this concerns the number of the post-anal 

 ventral papillfe. Von Linstow finds an extra pair present behind 

 the second, whereas in my material there is no indication of 

 these papillse, neither were they present in Seurat's (1914) 

 material. It is therefore probable that von Linstow was mis- 

 taken in his observations, especially as my material and his are 

 from the same host, both from South Africa, and there further 

 appears no reason to doubt the identity of the two materials. 



(24) Physaloptera varani Parona, 1889. (Text-fig. 35.) 



The material on which the study of this species is based 

 consists of three males collected from Faranus hengalensis and 

 two females collected from V. indicus. I wish to express my 

 indebtedness to Professor Leiper for placing this material at my 

 disposal. 



The body is attenuated towards both extremities, and shows a 

 coarse transverse ringing in addition to a very line transverse 

 cuticular striation. The cuticle is partly reflected over the lips. 



The cervical papillae are situated laterally a short distance 

 behind the junction of the two oesophageal parts ; on the same 

 level or just posterior to it is the opening of the excretory 

 gland. 



The two lateral lips are large and tall. Each is provided with 

 a large external tooth whose tip is slightly recurved ; attached 

 to it on its inner surface there is a small and membranous spike- 

 like tooth, and on each side of it, towards the angles of the lips, 

 there is a small bifid tooth. Externally each lip carries a large 

 subdorsal and subventral papilla. 



The oesophagus is long, and forms in the male l/6th and in 

 the female l/5'5 of the total body-length. Its anterior muscular 

 part is slightly thinner than the following glandular part, and 

 the nerve ring encircles it about 80 jx from its base. 



Female. 



The two females are respectively 35 and 17 mm. long by 1 mm. 

 and 530 ju, broad ; the body is terminated by a pointed tail l/80th 

 of the total length, with its caudal pores just behind its middle. 



The vulva is non-protuberant, and is situated at the junction 

 of the 1st and 2nd quarters of the body ; it leads, in the 

 smaller female, into a thick- walled vagina 950 /a long by 85 /a in 

 diameter ; this passes gradually into the egg-chamber, which is 

 1*8 mm. long and 170 /a thick. The common trunk which follows 

 it is 1*14 mm. long and 50 fx in diameter. The first two parts pass 



