VENOMS IN THE ANIMAL SEEIES 



807 



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. orhicularis (fig. 117), and C. tigrinus (fig. 118), both of 

 which are found in the Indian Ocean. 



Fig. 117. — Chilomijcterus orbicularis (Indian Ocean), (.\fter Savtscheuko.) 



Fig. 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 SiluridcB and Muranidce, include venomous species. 



