BY VERA IRWIN-S2HTH. 419 



Physaloptera ANTARCTICA Linstow var. typica. 



Of four nematodes found, with two ecliinorhynchs, in the stomach of I'aranus 

 varius by Dr. Cleland, three large females appear to belong to this species. They 

 measure respectively 27.5, 36.5, and 40 mm. in leng-th, and all have fully deve- 

 loped genitalia of the typical form, but without developed eggs. 



Measurements of the largest example are as follows: — Maximum diameter, 

 1.0 mm.; diameter at base of collarette, 320 /x; at anus, 400 ^u.; tail, 512 ju, long. 

 Distance of cephalic extremity from nerve ring, 384 ^x; post-cervical papillae, 

 608 jj. ; excretory pore, 720 ^ ; vulva, 9.9 mm. ; most anterior loop of uterus, 8.0 

 mm. Distance from posterior extremity of most posterior loop of uterus, 7.6 

 mm.; of reeeptacula seminis, 5.3 to 7.6 mm. Maximum width of uterus, 176 ft; 

 width at junction with receptaculum seminis, SO /j.; width of oviduct at junction, 

 64|«,. Receptaculum seminis, 240 x 192 ^. Vestibule, 1.44 mm. x 112 ju,; re- 

 servoir, 1.36 mm. s 192|U.; common trunk, 1.28 mm. x SO jj.; length of the two 

 branches, to second bifurcation, 240 and 320 /j,. Muscular oesophagus, 400 x 160 

 /jL ; total length of oesophagais, 4.36 mm. ; width at its base, 384 fj.. Proportion 

 of total body length to that of oesophagus, 9.17: to that of portion of body in 

 front of vulva, 4.0. 



The reservoir and adjoining dncts, which are devoid of contents in the 

 three examples, show a variability in disposition in the body similar to that 

 already described for this species (Irwin-Smith, These Proceedings, 47, 1922, 

 pp. 237-9), but the general trend of the duets is backwards from the vulva, and 

 the four slender uteri have an almost straight, parallel course down the body. 

 The structure of the lips is not very clear in these specimens (examined in 

 alcoholic phenol), and no internal denticular border is discernible. In view 

 of the absence of male specimens, and of developed eggs, and the close general 

 resemblance already shown to exist between unripe females of P. antarctica and 

 P. hancrofti, these specimens have been assigned to the former species chiefly on 

 account of the great length, which corresponds exactly with that recorded for 

 P. antarctica. 



Physaloptera varani is the only species hitherto recorded from hosts of the 

 genus Varanus. The present specimens differ from it in their larger size, the 

 dichotomous instead of direct division of the common trunk, the decided dif- 

 ference in the lengflis of ovijector and common trunk in the two forms, and 

 in the tail. 



Host. — Varanus varius. Location. — Stomach. Locality. — Bumberry, near 

 Manildra, N.S.W. 



Collected by Dr. J. B. Cleland, 8/1/16. 



Note. — In the description of P. antarctica given in the third paper of this 

 series, the collection described as Lot C. was recorded as containing only 29 

 specimens. After that paper was in print, a jar containing nearly 900 addi- 

 tional specimens of the same collection, in glycerine alcohol, was discovered. 

 They were all taken from the stomach of a single example of Tiliqua scincoides 

 on August 12, 1919. Portion of the stomach wall, with Physaloptera still at- 

 tached, was also preserved. They were deeply embedded, by the anterior end, in 

 the mucosa, and the whole surface of the stomach was closely pitted with the 

 holes made by them. Most of the specimens are small and immature, under 17 

 mm. long, none more than 30 mm. long and the smallest laxvae not more than 

 4 mm. long. 



Physaloptera clelandi, n.sp. 



Four broken pieces of a single female specimen very different from those 

 described above occur in the same collection with them, taken from the same 



