NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



217 



papillae (fig. 284). The anterior ovary extends forward as far as the 



posterior extremity of the esophagus. The very niunerons eggs are 



large, elliptical, and thick shelled, and not well developed when 



oviposited. 



Hosts. — Ay'vicanthus ahyssinici/s, Epimi/s ugandae (Mv-^ ugandae). 



L Gcatioii. — Intestine. 



Locality. — Fort Portal, Africa. 



Parona (1909) states that there are two 

 small papillae posterior of the clocal aper- 

 ture, but his figure is not in harmony with 

 this. He also says that the body is not 

 striated, but this is contradicted by his 

 figures and is contrary to the condition 

 customary in Physaloptera and related 

 genera. 



I have assumed in the key that eggs stated 

 as "large" exceed 22 ja in diameter. That 

 these eggs should not be 

 well developed at oviposi- 

 tion is rather surprising. 



if ^ 



Fig. 283.— Physaloptera ru- 

 wenzorii. a, posterior ex- 

 TREMITY OF male; 6, SPI- 

 CULES. Enlarged. After 

 Parona, 1909. 



PHYSALOTERA SCIURI 

 Parona, 1898. 



Fig. 2S4.— Physalop- 

 tera RUWENZORII. 



Vulva. Enlarged. 

 After Parona, 1909. 



Specific d. ia gnosis . — 

 Physaloptera (p. 212) : 

 Mouth with two large lips 

 of circular contour. Each lip bears leaflike external teeth and has 

 two papillae at its base (fig. 285). There is a large cuticular ring 

 at the base of the head. The cuticle is transversely striated. 



Male 16 mm. long and 500 [j. thick. The head is 13 pL in diameter 

 at the level of the cuticular ring. The cuticular striations are at 

 intervals of 25 /n and are more distinct in the posterior portion of the 

 body. The bursa is large and lanceolate in outline (fig. 286). No 

 sessile preanal papillae observed. There are three pairs of sessile 

 postanal papillae and one unpaired sessile postanal papilla. This 

 latter is close to the cloacal aperture. The posterior pair of post- 

 anal papillae are close to the tip of the tail and the other two pairs 

 of postanal papillae are near the margin of the bursa and approxi- 

 mately midway between the posterior pair and the unpaired papilla. 

 There are numerous cuticular elevations in the postanal region, a 

 prominent series extending from the last pair of postanal papillae to 

 the last pair of stalked papillae. The cloacal aperture is large and 

 circular and has a scalloped, elevated margin. 



