1909.] 



F. H. Stewart : Investigator sicarius. 



287 



The foregut (pi. xxi, fig. 5) extends throughout the neck, lying in the dorsal 

 division of the cœlom. Its structure offers nothing worthy of remark. 



gL ap. 



Fig. 2. — Transverse section through the tip of the poison fang showing the opening of the poison 

 gland, X 700: cart. = cartilage; c.e. =■ cutting edge; chit. = chitinous cap ; gl.ap. = aperture of poison 

 gland. 



At the junction of neck and body a large blind sac grows out from the ventral 

 wall of the canal and this outgrowth marks the division of the hind- from the fore- 

 gut. The hindgut (pi. xxi, fig. 7) is a narrow cylindrical tube which does not appear 



Fig. 3. — Diagrammatic reconstruction of the poison fang : cart, 

 gl.ap. = aperture of poison gland ; p.gl. — poison gland. 



= cartilage ; chit. = chitinous cap ; 



