THE GENERA OF NEMERTEANS. 209 



Genus Folia delle Chiaje. Head separated from the body, 

 by a very faint constriction and rounded anteriorly as in Cari- 

 nella. The jDOsterior lobes of the ganglia communicate by 

 means of ciliated canals with two transverse cephalic grooves 

 which do not meet on the dorsum but carry numerous 

 short parallel grooves , perpendicular to the first. Eyes with 

 lenses. Two longitudinal nerve-trunks in the proboscis. 



6. Polia delineata delle Chiaje. 

 Synon. Baseodiscus delineatus Diesing. 



This species attains to a considerable length, always 

 remaining comparatively thin. Dark brown stripes longi- 

 tudinally intersecting the light brown ground colour are 

 present ventrally as well as dorsally, even in the youngest 

 stages. About five to seven may be counted in a trans- 

 verse line across the back. The mouth is small and is 

 situated immediately behind the ganglion. The posterior 

 lobe of the ganglion is characterized by a special greenish hue. 

 Up to twenty-three eyes were counted on each side of the 

 head. Proboscis very thin. Next to Cei^ebratulus marginatus 

 and Amphiporus pulcher this is the most common species 

 in Naples. 



7. Polia curta n. sp. 



Distinguished from the foregoing by its greater width in 

 comparison to its length. The brown stripes are much 

 more closely set on the back, 12 — 15 being counted in a 

 transverse line on the back. The belly remains white; 

 only in the very largest examples it becomes striped too , 

 the region of the mouth and undersurface of the head 

 always excepted. In very young examples the stripes are 

 yet stellate pigmentspecks , whereas at the same age they 

 are stripes already in Polia delineata. Eyes , ganglion and 

 cephalic grooves as in this species. 



8. Polia minor n. sp. 



This interesting species has on superficial inspection a 



Notes from the Leyden IMuseuni. 



14 



