80 
Gnathostoma siamense (Levinsen) 
appears to depart from this rule and wander into the connective tissues. 
Moreover the forms examined by Levinsen and myself are both sexually 
immature. These facts taken together suggest that Man may not be 
the normal host for Gnathostoma siamense although the parasite is able 
to exist within the human body. Several instances might be quoted to 
show that where a parasite is able to survive in a closely related host 
it takes on a wandering habit. 
The genus Gnathostoma. 
The genus Gnathostoma comprises the following species: 
1. G. gracile (Diesing) 1842, in Sudis gigas. 
2. G. hispidum (Fedschenko) 1839, in Sus scrofa. 
3. G. horridum (Leidy) 1856, in Alligator misissipiensis. 
4. G. paronai Porta 1908, in Mus rajah. 
5. G. robustum (Diesing) 1839, in Felis catus. 
6. G. siamense (Levinsen) 1889, in Homo sapiens. 
7. G. sociale (Leidy) 1858, in Mustela vison. 
8. G. spinigerum Owen 1836, in Felis tigris. 
9. G. turgidum Stossisch 1902, in Didelphys azaree. 
The species Gnathostoma shipleyi belongs to the genus Rictularia. 
G. robustum of Diesing most probably is a synonym of G. spinigerum, 
Owen. G. siamense is very closely related to G. spinigerum and 
G. paronai and may eventually prove to be specifically identical with 
one or other of these two forms. 
REFERENCE. 
Levinsen, G. M. R. (1889). Vidensk. meddel. fra naturh. Foren. i. Kjpbenliavn 
f. 1889, p. 323. 
