242 



NEMATODES OP THE GEJStUS PHZSALOPTERA, 111. 



short distance of the anus. Maximum diameter of uterus .336 mm., much larger 

 in the smaller specimens than in var. typica ; crowded and distended with well 

 developed eggs in specimens of 18 and 19 mm. lengths; measuring .288 mm. in 

 width, as compared with .080 mm. in the other form. The terminal portions of 

 the system variable in arrangement, but frequently reservoir and common trunk 

 fonn a U-shaped loop, and the uteri are much coiled in the region of the vulva, 

 rarely extending anterior to it, and never more than 1.8 mm. (Text-figs. 34-36). 

 The dimensions similarly variable, without relation to the length of the specimen. 

 Vestibule 1.0 to 1.44 mm. long; reservoir .56 to 1.08 mm. long; and .112 to .400 

 mm. wide; common trunk .64 to 1.12 mm. long; the two branches respectively 

 .08 and .16 mm. to .56 and .64 mm. long. Reeeptaculum seminis .416 mm. long 



Figs. 31-38. Pliysaloptera antaretica var. typica and var. lata. 

 31. Male spicules, var lata (x 32); 32. Immature specimen of same type as 

 var. typica, in collection A-, with var. lata, 20 mm. long, genitalia not developed 

 (x 5): 33. Tail of specimen shown in fig. 32 (x 20); 34-36. Female genitalia, 

 var. lata (x 10); 34- 19 mm. specimen; 35. 27 mm. specimen; 36. 33 mm. speci- 

 men; 37. Reeeptaculum seminis, var. lata (x 67); 38. Eggs from uterus, var. 

 lata (x 127). 



and .272 mm. wide; oviduct at junction with it .048 mm. wide, but uterus merg- 

 ing gradually into it, .080 mm. wide at junction. Uteri 20 to 30 mm. long; ovi- 

 ducts 1.3 to 1.7 mm. long. Distance of most posterior loops of uteri from tip 

 of tail .640 to 3.64 mm. 



Unfortunately, the student who collected these specimens (lot A) did not 

 make a specific record of the host from which they were taken, and the only 

 information available is "From the intestine of a lizard, Sydney, 1915." The 

 species commonly used for class dissection in the Zoology School in Sydney is 

 Tiliqua scincoides White, but at the date of this collection some specimens of 

 Egernia cimnmghamii Gray were included among the lizards examined in class, 

 and it is possible, though not probable, that the nematodes were taken from the 

 latter species. 



Examples of P. antaretica var. typica and type specimens of var. lata have 

 been deposited in the Australian Museum, Sydney. 



