THE GENERA OF NEMERTEANS. 207 



2. Cephalotrix signatus n. sp. 



This species immediately strikes us by its curious coloration 

 as well or by the disposition of the eyes. The belly is 

 white , the back of a uniform yellow. On the head the 

 pigment takes the form of two club-like horns, longitudi- 

 nal and parallel , with a white median streak between them 

 and united at their base by a short yellow transverse bar. 

 Two identical club-shaped yellow blotches appear on the 

 ventral side of the head. The small eyes (30 —40) are 

 placed on a row along the margin of the head; near the 

 tip of the snout there are two patches of eyes, each con- 

 taining about four or five. The proboscis is provided with 

 urticating elements. Length 15 mm. 



Family Carinellidae Mac Intosh (sens, strict.). 

 Lateral nerves situated to the exterior of the muscular 

 coat of the body-wall , which is composed of two layers. 



Genus Carinella Johnston. Snout wider than the rest 

 of the body , bluntly rounded in front , spathulate. A 

 transverse groove in the epidermis situated in the same 

 level with the ganglion , no ciliated duct in connection 

 with this groove. Intestine without coeca. 



3. Carinella annulata (Montagu) Mac Intosh. 



Synon. Carinella trilineata Johnston. 



Polia crucigera delle Chiaje. 



Valencinia ornata de Quatrefages, 



Nemertes superbus Kölliker. 



Siphonenteron elegans Renier. 



Tubulanus elegans „ 



This species is not rare in Naples. Its ground colour 

 varies from a light van Dyck brown to dark chocolate 

 brown. The average of specimens has four longitudinal 

 white lines running along the middle of the back , belly 

 and sides and intersecting the numerous white rings. In 

 several other specimens only the white rings were present, 



Notes irom the Leyden ^luseum. 



