Nogucb 



Plate 20 



A 



m' 





D 



Venom gland of Crotalus adamanteus. 



A. Longitudinal section. X 9. 



B. Cross-section, showing Tubular Raminous Structure. (Note abundant muscle-fibers 



running into the interacinous spaces.) X 100. 



C. Cross- section. X 9. 



D. Portion of Tubular Acinus, showing Columnar Epithelial Cells with Nuclei near Base 



of Cell Body. X 1000. 



