210 THE GENERA OF NEMERTEANS. 



very strong resemblance with true representatives of the 

 genus Amphiporus , hereafter to be described. It is com- 

 paratively short and stout, the single specimen I obtained 

 measuring 15 mm. in length and 4 to 5 mm. in width. 

 The eyes are exceedingly numerous; there are at least 

 80 on either side of the head. The proboscis seems to be 

 wider in the middle than at the two ends ; neither the 

 proboscis nor the proboscidian chamber occupy the whole 

 length of the body. In the tail it appears (on compression 

 of the animal) that the lateral nerves of both sides meet, 

 the commissure being situated above the anus. The colour is 

 a yellowish grey , merging into a reddish orange anteriorly ; 

 the sides of the body seem to be more or less transparent. 



Subordo II. SCHIZONEMERTINI mihi. 



A deep longitudinal lateral fissure on each 

 side of the head, from the bottom of which a 

 ciliated duct leads into the posterior lobe of the 

 ganglion. Lateral nerves between the longitu- 

 dinal and inner circular muscular coat of the 

 body-wall. Nervous tissue deeply tinged with 

 haemoglobine. Mouth behind the ganglia. 



Familia Lineidae Mac Intosh. 



Body more or less flattened. Nerve trunks situated quite 

 laterally, diametrically opposite. 



Genus Linens Sowerby. Body extremely long in compa- 

 rison to its width. Eyes very numerous. 



No species belonging to this genus were found at Naples ; 

 three species are known from the Atlantic: Lineus longis- 

 simus (Gunn) Sowerby, Lineus ohscurus Desor (Mac Intosh 

 makes the two species ont of it: Lineus gesserensis and 

 Lineus sanguineus) and Lineus lacteus (Montagu) Mac Intosh. 



Genus Borlasia Oken. Body round and massive, not 



Notes irom the Leyden Museum. 



