THE NEMATODE FAMILY GNATHOSTOMID^. 293 



"6. The spines iminediatelj^ behind the head-bulb leaf- 

 like, having five points, one at the tip and two 

 along either side G. gracile (p. 300). 



G. horridum and G. turgidum are too insufficiently described 

 to be capable of inclusion in a key. 



1, Gnathostoma spixigerum* Owen, 1S36. (Text-figs. 37-40; 

 PI. VII. figs. 29-32 ; PI. VIII. figs. 33-38). 



Gnathostoma sjnnigerum Owen (1836, p. 125). 



Cheiracanthus rohustus Diesing (1838, p. 189) [jiomen muhcm]. 



Cheiracmithus rohustus Diesing (1839, p. 222; pi. xiv. 



figs. 1-7, pi. xvi. figs. 1-24). 

 GheiracanthujS socialis Leidy (1859, p. 25). 

 Filaria radida Schneider (1866, p. 98 ; pi. vi. figs. 9 a, 9 b). 

 Gheir acanthus siamensis Leviiisen (1889, p. 323 ; pi. vii. 



figs. 9-14). 

 Gnathostoma par onai Porta (1908, p. 8). 

 Gnathostomum spinigerum Mitter (1912, p. 150 ; pi. v.). 



The contradictory and incomplete character of existing- 

 descriptions of this nematode, and the consequent unnecessary 

 multiplication of species, full}' justify its redescription. 



Text-figure 37. 

 L 





Gnathostoma spinigenim. Anterior end; dorsal (or ventral) view (surface). 



The specimens now described are from Felis pardus and were 

 received in part from the ^''eterinary College, Belgachia,, Calcutta, 

 where they were collected by the late Mr. S. N. Mitter, and in 

 part from the Parol Laboratory, Bombay. In each case the 

 worms had produced fatal perforation of the gastric wall. 



In this species the cuticle lining the inner aspect of each lobe 

 of either lip is longitudinally thickened into a ridge which meets 

 its fellow of the opposite side. In our specimens the head-bulb 



* For specific diagnosis, see p. 298. 



20* 



