SUMMARY 



This paper consista of the histologic study of the glands of the head of 

 Brazilian ophidians. 



Ophidians have been divided into non-poisonous ; aglyphs, opisthoglyphs 

 and boideans and poisonous: solenoglyphs, and proteroglyphs. 



Of each of these groups some types have been taken: From the group of 

 aglyphs have been studied: Drymobius bifossatus (Raddi), Xenodon mer- 

 remii (Wagl.) and Rhadinaea merremii (Wied.) ; of the opisthoglyphs, Phi- 

 lodryas schotti (Schelegel), Tomodon dorsatus (D. B.) Thamnodynastes 

 nattereri (Mikan). 



From the Boideans have been studied: ConstHctor constrictor. (L.). 

 These species constitute the first part of this study. 



In these various species the different glands of the head have been stu- 

 died in the following order: maxillary glands, rostral, mandibulary glands, 

 nasal, anterior and posterior, sub-lingual and lacrymal. 



