206 THE GENERA OP NEMERTEANS. 



other authors, whereas the new species and those which 

 have heen confounded with others will be described more 

 circumstantially. The exact and detailed synonymy of each 

 species cannot as yet be given in full. For several of the 

 species which are about to be mentioned , Mac Intosh's 

 elaborate monograph gives a list of synonyms to which I 

 may be allowed provisionally to refer. 



Subordo I. PALAEONEMERTINI mihi. 



No deep lateral fissure on the side of the 

 head. No stylet in the proboscis. Mouth behind 

 the ganglia. 



Famiha Cephalotricidae Mac In tosh. 



The dorsal commissure of the ganglion in front of the 

 ventral one. Lateral nerves placed between the longitudinal 

 muscular coat and an isolated inner band of fibres. The 

 proboscis has three coats. 



Genus Cephalotrix Oersted. Head pointed, continuous 

 with the body. No posterior respiratory lobe to the gang- 

 lion, nor ciliated duct leading to the exterior. 



1. Cephalotrix linearis (J. Rathke) Oersted. 

 Synon. Cephalotrix bioculata Oersted. 



„ occellata Keferstein. 



„ longissima „ 



„ filiformis Mac Intosh. 



Astemma rufifrons Oersted. 

 To this species I refer a small number of specimens 

 from the bay of Naples with about 20 — 30 very small 

 eyes quite close to the body margin. The intestine was 

 not provided with coeca. Laterally about on the same 

 level with the mouth and with the hindermost eye-speck 

 a very small opening was noticed (of the watervascular 

 system?). Brown pigment was present on the tip of the 

 snout; the animals were whitish and measured up to 5 mm. 



Notes from tlie Leyden ]NXuseura. 



