THE NEMATODE FAMILY GNATHOSTOMID^. 



253 



Specific Diagnosis. 



Spiroxys gangetica. 



A stoutish Spiroxys ; each lip carries a special armature of six 

 fine sharp teeth, one on either edge of each lobe; the flattened 

 inner surfaces of the dorsal and ventral lobes are applied to those 

 of the opposite side ; spicules end in a blunt point ; caudal notch 

 in female very fine. 



Table I. — Measurements of the Species of Spiroxys. 

 (All measurements in millimetres.) 



)S. contorta. 



Length 15-25 20-4.-30 



Thickness 0-5-0-7 0-45-O-6 



Lips: dorso-ventral diameter 0'11-0'13 0'13 



Lips: length '. 0-05-006 0-06-0-07 



Distance between striations of bodj- 0"005 0004 



Distance from head-end to cevvical papillse ... 0-65-1-0 — 



„ iiert-e-ring : 0-4-0-6 0-5-0-7 



„ end of oesophagus' 1-9-3-6 2-4-3-0 



„ ,, „ excretory pore ...0-45-0-75 0'6 



Length of tail 0-3-0-4 5-0-55 



Length of spicules 2-37-30 — 



Distance from tip of tail to vulva — 8-2-13-6 



„ „ „ caudal papillaB(? ) — Not seen 



Size of ova (maximum) ! — 0-07XO-05 



S. gangetica. 



39-43 



0-75 



0-11-0-13 



0-14-0-16 



0-0125 



1-2-1-275 



0-75-0-825 



3-9 



0-925-1-15 



0-35 



R. 2-1 



L. 2-25 



48-50-3 

 0-85-0-95 



013 



0-16-0-2 



0-013-0-0175 



1-125-1-5 



0-8 



4 to 4-3 



0-9-1-0 



0-65 



20-27 

 0-32 

 0-06X0-04 



