422 NEMATODES OP THE GENUS PHTSALOPTERA, iv., 



ternal median tooth large, erect, sharply-pointed, a small tooth, apparently 

 double-pointed, at its base internally; the pair of lateral teeth on each side well 

 developed, sharply-pointed; no internal denticular border discernible; the pair 

 of papillae on the external cuticular pad on" each lip large, prominent (Text-fig. 

 22). Oesophagnis one-fifth of body leng-th, muscular oesophag-us narrower than 

 glandular, and sharply distinct from it, the muscular part light in colour, the 

 glandular part very dark, its base broadly rounded. Nerve-ring just in front of 

 junction of muscular and glandular portions; the post-cervical papillae just be- 

 hind the junction (Text-fig. 23). What appear to be cervical glands extending 

 back nearly to the level of the papillae. Tail sharply pointed, 1/32 to 1/35 

 of the total body-lengih ; narrow transverse muscular bands across body in re- 

 gion of anus; rectal glands large (Text-fig. 24). 



Measurements. — Total leng-th, 6.7 mm.; maximum diameter, 336 ju,; diameter 

 at base of collarette, 128 /j,; at anus, 128 /t. Tail, 190 /a long. Distance from 

 cephalic extremity of nerve-ring, 185 /i; post-cervical papillae, 256 /i; excretory 

 pore, 296 ^. Buccal cavity, 33 /x ; muscular oesophagus, 176 x 59 ^u, ; total length 

 of oesophagus, 1.34 mm. ; width at its base, 103 fi,. 



Host. — Lialis burtonii Gray. Location. — Intestine. Localiti/. — Helensburg, 

 New South Wales. 



In Dr. .J. B. Cleland's collection. Collected by Dr. Cox, 2/1/15. 



These lai-A'ae differ from those of P. antarctiea, and from those found in 

 Gymnodactylus platurus and assigned to P. bancrofti, in having a much thicker 

 and more opaque body. They are of heavier build altogether; the oesophagus is 

 relatively a little shorter and broader, and the nerve-ring is nearer to the junction 

 of muscular and glandular oesophagi (Text-figs. 17-19, and 20-23). 



According to Dr. Cleland's notes, another lot of Nematodes was obtained 

 from this host, collected by Miss Wearne at Manly, Sydney, in June, 1915, and 

 described as "a bunch of Nematodes attached to the small intestine, and a free 

 Nematode, apparently of another species." These were probably Physaloptera, 

 but, unfortunately, the specimens are not available for examination. 



Phtsalopteea sp., from Lygosoma entrecasteauxii. 



A single, small, immature female, taken from the same host which har- 

 boured an Oxyuris sp., and the Rictularia disparilis already described in a sepa- 

 rate paper (Irwin-Smith, These Proceedings, 47, 1922, p. 311), cannot at present 

 be placed more definitely than Physaloptera sp. In this specimen, preserved in 

 alcohol, the body is withdrawn about .2 mm. from the cuticle at each extremity. 



The body is robust, heavy, rather opacjue, of uniform diameter, not much 

 attenuated towards the extremities (Text-fig. 25). Cephalic collarette well deve- 

 loped. Labial papillae large. External median tooth large, erect, sharply- 

 pointed; a double-pointed tooth at its base; broad, paired, lateral denticles; pos- 

 sibly a single continuous row of very minute internal denticles, but this rather 

 indefinite; a row of small lateral marginal denticles (Text-fig. 26). Oesophagus 

 about one-fifth of body-lengfh, relatively broad, muscular oesophag-us very short, 

 its junction with glandular oesophagnis not veiy clear; nerve-ring apparently 

 just at junction. Base of glandular oesophagus broad and rounded, not deeply 

 inserted into lumen of intestine (Text-fig. 27). Tail one-thirty-third of body- 

 length, sharply pointed, ventrally infiected at tip (Text-fig. 28). Four uteri. 

 Vulva .5 mm. behind base of oesophag-us, at 1/3.8 of the body-leng-th from cep- 

 halic extremity. Vestibule and reservoir both long, and reservoir broad and very 

 well developed, pear-shaped, sharply delimited from common trunk (Text-fig. 



