418 NEMATODES OP THE GENUS PHYSALOPTEBAj iv., 



1921, and in each case the nematodes were found in the intestine, and were 

 thought to be Oxyuriidae. Unfortunately, only one of these collections was pre- 

 served, and this consists of four females of Pharyngodon sp. Dr. Cleland's 

 collection contains only the one lot of nematodes from this host. A second 

 specimen was examined by him, at Sydney, in February, 1916, but it contained 

 no entozoa. 



Affinities. — As will be seen from the description, Physaloptera bancrofti 

 presents the closest affinities with P. antarctica. The most notable differences are 

 found in the smaller size of the body, the much greater disproportion in the 

 length of the spicules, and the size and shape of the eggs, which are longer 

 and narrower than in P. antarctica. In P. antarctica tie left spicule reaches 

 only just beyond the anterior rim of the bursa, and the right is three-fifths of 

 its length, and is relatively broader and of much heavier build than in P. ban- 

 crofti. Other distinctive features of the new species are the denticular forma- 

 tion on the lips, the slightly more anterior position of the post-cervical papillae, 

 the shallowness of the insertion of the oesophagus into the intestine and its 

 blunt base, and the conspicuous caudal papillae and anal muscular bands. 



Of the other species with four uteri, P. voirani comes nearest to it, both in 

 the lengths of the spicules, the total length of the body, and the position of the 

 vulva, but it differs from P. bancrofti in the direct instead of dichotomous 

 division of the common trunk into four uteri, the much longer vestibule, the 

 shorter common trunk, and the slightly longer tail in the female. 



Measurements (in mm.) of specimens of P. bancrofti taken from three collections. 



Total length . . , . . . . 



Maximum thickness 



Tail (anus to tip) 



Diameter at anus . . . . 



Distance from cephalic extremity 



of : — Middle of nerve ring . . . 

 ■ Post-cervical papillae . . . 



Vnlva 



Buccal cavity 



Muscular oesophagus 



Entire oesophagus 



Proportion of total length to that 



of oesophagus 



Vestibule 



Reservoir length 



width ■ ■ 



Common trunk 



Distance from posterior extremity 



of: — Caudal pores 



Most posterior loop of uterus 



Eggs 



Spicules left 



right 



Length of bursa 



Lateral width of bursa 



Diameter above bursa 



Lengths of external bursal 



papillae 



Collec- 



Collec 



Collec- 



Collec- 



Collec- 



tion. 



tion. 



tion. 



tion. 



tion. 



1 



2 



3 



I 



3 



larva 



? 



2 



<s 



c? 



5.0 



29.5 





10.5 





.256 



1.0 



..544 



.480 



.400 



.208 



.480 



.400 



.832 



.960 



.130 



.432 



.320 







.192 



.320 





.288 





.250 



.448 



7.28 





.384 





.026 



.064 





.037 





.185 



.320 





.292 





1.34 



3.48 





2.40 





3.76 



8.47 

 1.28 

 1.28 

 .128 

 .960 



.160 

 6.28 



.144 

 .912 



.176 

 3.70 



4.37 









.057 x .028 











.776 



1.24 









.185 



.256 









1.60 



1.72 









.800 



.880 









.448 



.368 









.160, .192, 



.176, .304, 









.144, .122 



.224, .128 



