COE : NEMERTEANS OF WEST AND NORTHWEST COASTS. 37 



proboscis (Text-figs. 7, 8, 11). These glands are usually very gran- 

 ular and opaque. 



The stylet itself is more or less transparent and glassy, with a 

 central core of more granular nature, which stains readily with 

 ordinary reagents. 



In all genera except Carcinonkmertes there are also at least two 

 pouches of accessory stylets in addition to the central stylet and its 

 basis. These pouches open by narrow canals into the anterior pro- 

 boscis chamber immediately in fi-ont of the septum (PI. 17, fig. 107 ; 



Fig. 12. — Arnphiporus cruentatus. Optical section of stylet apparatus of pro- 

 boscis after extrusion. 



PL 18, fig. 115; PI. 23, fig. 17.5- PI. 24, fig. 194; PI. 25, figs. 200, 

 201). These stylets are, when fully formed, exact counterparts of 

 the central stylet. In most species the stylets are perfectly smooth 

 and evenly pointed, although in Emjylectonenia purpuratum they 

 are fluted (PL 17, figs. 107, 108; PL 22, figs. 159, 160), and in 

 Paranemertes peregrina (PL 16, fig. 96) they are grooved spirally. 

 In a few species, as Emplectonema gracile^ both central and acces- 

 sory stylets are curved like a saber (Text-fig. 32) . 



