THE GENERA OF NEMERTEANS. 221 



integument of the back. Immediately behind the respi- 

 ratory fissures the body margins close together dorsally. 

 Along the bottom of this dorsal furrow the proboscidian canal 

 often protrudes as a rounded longitudinal ridge. 



After immervsion in spirit the head appears as if sepa- 

 rated from the body by a shallow groove , much less pro- 

 nounced in life. The tip of the tail has often a very pointed 

 appearance. 



Subordo HOPLONEMERTINI mihi. 



One or more stylets in the proboscis. Mouth 

 generally situated before the ganglia. Lateral 

 nerves inside the muscular coats of the body 

 wall. No deep longitudinal fissures on each 

 side of the head. 



Familia Aniphiporidae Mac Intosh. 



Body when extended comparatively short and wide. The 

 proboscis which is easily and repeatedly extruded is thick 

 in the extensile part and covered with large adhesive 

 papillae. Numerous longitudinal nerves in the proboscis. 

 A transverse respiratory furrow on the head, generally with 

 short perpendicular furrows as in Polia. A ciliated duct from 

 the posterior ganglionic lobe to this furrow. 



Genus Amphiporus Ehrenberg. 



A single central stylet in the proboscis with two or 

 more accessory styliferous vesicles. No accessory mem- 

 branaceous sacs in communication with the proboscidian 

 cavity. Numerous, well developed eyes. 



28. Amph{po7'us pulcher (Johnst.) Mac Intosh. 

 Synon. Planaria rosea 0. F. M. 

 Nemertes pulchra Johnst. 

 Vermiculus rubens Dalyell. 

 V Amphiporus albicans Ehrenberg 

 (from the Red Sea). 



Notes Ironi the Leyden IVXuseuui. 



