NOTES ON NEMATODES OF THE GENUS PHYSALOPTERA. 



Part iv. The Physalopteba op Australian Lizards (continued). 



By Vera Iewin-Sjiith, B.Sc, F.L.S., Linnean Maeleay Fellow of the Society 

 in Zoology. 



( Thirty-eight Text-figures. ) 



[Read 25th October, 1922.] 



From a gecko, Gymnodactylus platurus Shaw, three lots of material have 

 been examined, the fii'st taken at Narrabeen, near Sydney, November, 1915, the 

 second from the stomach of a single individual at Quaker's Hat, Middle Harbour, 

 Sydney, October 3, .';9'21, the third from the stomach of another host of the same 

 species at Narrabeen, April 18, 1922. The fii'st collection was made by Dr. J. 

 B. Cleland, the other two by Miss M. J. Bancroft and Mr. I. M. Mackerras, the 

 three collectors whom I have to thank, also, for the other material dealt with 

 in this paper. 



The fii'st collection consists of six larvae under 7 mm. long, and a small 10 

 mm. male, the second of four females, from 24 to 29.5 mm. long, in which 

 eggs are not developed, evidently unfertilised, the third of the posterior ends of 

 three males and two females. These last specimens, Mr. Mackerras informs me, 

 were found attached to the stomach wall, and were broken when they were be- 

 ing removed. The intestine, with the basal portion of the glandular oesophag-us 

 attached, projects from the torn end in two males and one female. Unfor- 

 tunately, they are the only fully mature specimens available, and the absence of 

 the anterior end makes it difficult to prove their specific identity with the other 

 specimens collected from this host ; but a careful comparison of all the specimens 

 indicates that they are the one species, and the following description is based on 

 this assumption. Measurements of examples from each of the three collections 

 are tabulated for comparison. 



Phts^u.optera bancrofti, n.sp. 



White, clear, elongated, slender bodied, not enlarged posteriorly, tapering at 

 each extremity. Cuticle very thick, transverse stiiation very fine, striae about 

 3^ apart. Cephalic collar variable in size, narrow, or cuticle pushed well be- 

 yond top of head. Cervical alae well developed to beyond junction of muscular 

 and glandular oesophagus. Lips slightly trilobed; buccal papillae large; ex- 

 ternal median tooth broad, erect, a small, double-pointed tooth at its base; no 

 inner denticular border, but one small, sharply-pointed denticle visible on each 



