THE NEMATODE FAMILY GNATHOSTOMID 



253 



Specific Diagnosis. 



Spikoxys gangetica. 



A stoutish Spiroxys; eacli lip carries a special ai-matiire of six 

 fine sharp teeth, one on either edge of each lobe; the flattene<l 

 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. 



>S'. gangetica. 











?. 



(?. 



?. 



Length 



15-25 



20-4-30 



39-43 



48-50-3 



Thickness 



0-5-0-7 



0-45-0-6 



0-75 



0-85-0-95 



Lips: dorso-ventral diameter 



0-1 1-0-13 



0-13 



0-11-0-13 



0-13 



Lips: length 



0-05-006 



0-06-0-07 



0-14-0-16 



O-lB-0-2 



Distance between striations of bodv 



0005 



0-004 



0-0125 



0-013-0-0175 



Distance from head-end to cervical papillae... 



0-65-ro 





1-2--1-275 



1-125-1-5 



„ „ nerve-ring 



0-4-0-6 



0-5-0-7 



0-75-0-825 



0-8 



„ „ „ end of cesophagus 



1-9 -3-6 



2-4-3-0 



3-9 



4 to 4-3 



„ „ „ excretory pore ... 



0-45-O-75 



0-6 



0-925-1-15 



0-9-1-0 



Length of tail 



0-3-0-4 



0 5-0-55 



0-35 



0-65 



Length of spicules 



2-37-3-0 





( R. 21 

 I L. 2-25 





Distance from tip of tail to vulva 





8-2-13-6 



20-27 



„ „ ,, caudal papilla^( ? ) 





Not seen. 





0-32 



Size of ova (maximum) 





0-07X0-05 





0-06X0-04 



Table II. — Hosts and Distribution of the Species of Sjnroxys. 



Species. 



Host. 



Local it;Y. 



Recorder. 



8, contorta. 



E)u//s [_TestHdo \ orbicularis. 



[E. enropcea.^j 

 JSiiigs [Testudo] orbicularis. 



[E. lutaria.~] 

 Emys [Testtido] orbicularis. 



\JE. europcea.j 

 JEmi/s [^Testudo^] orbicularis. 



( Water-Tortoise.' ) 

 Eiuj/s serrata. 



Emvs retictdata. 

 Cisfudo Carolina. 



Europe. 



5J 

 35 



N. America. 



5) 



Kudulplii (1819). 

 Schneider (1866). 



V. Linstow (1909). 



Baylis & Lane 

 (presyut paper). 



Leid}' (1856). 

 [Recorded as Pliysa- 

 loptera contorta .1 



3) 3J 





Kinostern um pennsi/lva n ic u m . 







S. gangetica. 



Trionj/.v gangeticus. 



India. 



Baylis & Lane 

 (present paper). 



