VENOMS IN THE ANIMAL SERIES 307 
of their spines, which are sometimes scattered all over the body, are 
the species of the genus Chilomycterus, the most important of which 
are C. orbicularis (fig. 117), and C. éigrinus (fig. 118), both of 
which are found in the Indian Ocean. 
Fie. 117.—Chilomycterus orbicularis (Indian Ocean). (After Savtschenko.) 
Fic. 118.—Chilomycterus tigrinus (Indian Ocean). (After Savtschenko.) 
C.—TELEOSTEI.—PHYSOSTOMI. 
This Order is characterised by the presence of a pneumatic duct to 
the air-bladder. It consists of a large number of families, only two 
of which, the Siluride and Murenide, include venomous species. 
