230 THE GENERA OF NEMERTEANS. 



The handle of the central stylet in the proboscis is 

 abrubtly truncated behind and thins off anteriorly. Two 

 styliferous vesicles each of them with two accessory stylets 

 were observed. Corpuscles of the proboscidian fluid appa- 

 rently bacillary. 



45. Oerstedia unicolor n. sp. 



Eyes as in the foregoing species. Ground colour a uni- 

 form brown which, microscopically examined, seems to consist 

 of an exceedingly fine meshwork. A white transverse band 

 across the tip of the snout. Another on a level with the 

 posterior pair of eyes. These eyes are connected by a trans- 

 verse band of dark pigment. Handle of the stylet not trun- 

 cated; resembling that of Amphiporus and Tetrastemma. 



Familia Nemertidae Mac Intosh. 



Body long and coiled, eyes generally numerous , smaller 

 and less developed than in the Amphiporidae. 



Genus Nemertes Cuv. (char, emend.). Posterior part of the 

 proboscis comparatively short. Proboscis very seldom extruded. 



46. Nemertes gracilis Johnston. 

 Synon. Nemertes balmea Quatref. 



Numerous in Naples. Easily recognized by the characte- 

 ristic stylet-handle and long accessory stylets. All diife- 

 rent colour- varieties between yellowish, grey, green and 

 blue came under observation. The species has a great 

 hardihood in confinement. 



47. Nemertes echinoderma (Marion) Hubr. 

 Synon. Borlasia echinoderma Marion. 



This species is immediately characterized by the curious 

 corpuscles imbedded in the epiderm which have the form 

 of bent transparent hooks , pointed as both ends. The handle 

 of the stylet is abruptly truncated posteriorly. Eyespecks 



Notes from the Leyclen üMuseuni. 



