BY VERA IRWIK-SMITH. 55 



species, known from lizards, may be taken to be not more than nine, or, at most, 

 ten. But, as this assumption is based onlj' on a comparison of the descriptions 

 given by the ' authors, and specimens are not available here for study, it has 

 seemed better to retain the present status of the different species, pending fur- 

 ther investigation. Therefore I ha.ve merely indicated the probable synonymy, 

 in a discussion under the diagnosis of each doubtful species. 



A list of the hosts in which the species are found is given in the first paper 

 of this series (Ii-win- Smith, 1921). 



The Physaloptera of lizards. 



A. Species with uterus divided into four branches. 



Physaloptera pallaryi Seurat, 1917. 



External labial tooth triangular, sharply pointed, erect; about 20 sharp den- 

 ticles forming a very plain internal denticular border to the lip. Buccal frame 

 slightly trilobed, bearing a pair of very small papillae. Muscular oesophagus 

 slender, narrower than the glandular oesophagus. Body of female much at- 

 tenuated anteriorly, thick and robust posteriorly. Vulva not salient; opening in 

 front of termination of oesophagns; ovijector and reservoir long (1.55 mm.) ; un- 

 paired trunk of uterus fairly long (650 fx.), dichotomously divided into four 

 branches. Caudal pores opening at posterior fifth of tail. Male tail (not figured) 

 very short, provided with two narrow wings which do not reach the extremity. 

 Three pre-anal papillae close to anterior border of cloaeal ring, first pair of 

 post-anal papillae right on posterior margin of the ring, fourth pair only a short 

 distance from caudal point. Spicules very short, only slightly unequal. Wart- 

 like cuticular protuberances surrounding cloaca big and salient. Measurements 

 as given in table. 



Physaloptera abbreviata Rudolphi, 1819. 



Body robust. The two lips very big, each bearing a large wedge-shaped ex- 

 ternal labial tooth, truncated at the extremity, and, on the inner face, a number 

 of small teeth. The usual pair of external labial papillae. Muscular oesophag-us 

 massive, as wide as glandular oesophagus. Body of female attenuated at both 

 extremities. Vulva not, or only slightly, salient; its position variable, opening 

 either before or behind termination of the oesophagus: vestibule very long 

 (3.5 mm.), unpaired trunk of uterus fairly long, dichotomously divided into four 

 branches; seminal receptacles 150 jj, x 120 n, clearly marked ofl: from both uteitis 

 and oviducts by narrow constrictions. Caudal pores just beyond middle of tail. 

 Male tail elongated, inflected ventrally; caudal wings wide, cloaeal lips not 

 salient, cuticulai' projections arranged in longitudinal rows. Spicules very un- 

 equal. For number and arrangement of papillae see fignre. 



Reference is usually made to Linstow's description of this species, but a 

 good deal of additional information has been contributed by Seurat, who 

 examined the female genital system. Details supplied by Seurat have been in- 

 corporated in the above diagnosis, and the measurements given by him have been 

 used in the table. Linstow's measurements differ considerablj'. According to 

 him the oesophagus is one twelfth the total length; the tail, in the male, one 

 twenty-seventh, in the "female, one forty-seventh as long as the entire body; 

 male 9 mm. long, 600 ^ thick, female 18 mm. long, 870 ^ thick, the vulva divid- 

 ing the body in the ratio 8 : 31. Eggs 36 /x x 20 /j, in diameter. 



