VENOMS IN THE ANIMAL SERIES 



295 



secreting cells, which are elongate, pressed one against the other, 

 and supported at the base by a highly vascular substratum of 

 connective tissue. The venom flows out between the layer of cells 

 and the ensheathing membrane, which is capable of being pushed 



Pig. 105. — Pterois artemata (East Coast of Africa, Indian and Tropical Pacific Oceans), 



(.4fter Savtschenko.) 



slightly back as the result of the penetration of the spine into the 

 tissues, and then exerts pressure upon the reservoir. The latter is 

 formed by the distension of the sheath under the pressure of the 

 secreted liquid. 



There are twelve pairs of dorsal and three pairs of anal glands. 



