222 THE GENERA OF NEMERTEANS. 



A common species at Naples varying in colour from 

 vermilion to yellow in all the intermediate paler and 

 intenser shades. No specimen was met with which was 

 longer than 3 cm. Proboscis and cephalic grooves as des- 

 cribed by Mac Intosh. Posterior ganglionic lobe pyriform , 

 connected by commissures with the upper anterior lobe. 

 External opening of the ciliated duct (which is longer 

 than in Drepanojohorus) before the ganglion. 



29. Amphiporus lactijioreus (Johnston) Mac Intosh. 

 Synon. Polia mandilla Quatrefages. 



» mutabilis » 



» violacea » 



» berea » 



» glauca » 



Borlasia mandilla Keferstein. 

 Gordius albicans Dalyell. 

 Polystemma adriaticum Ehrenberg. 

 Cephalotrix armata (!) Uljanin. 



Compared with A. pulcher it is always much longer 

 and less wide. The white specimens seem to be more 

 numerous at Naples than those with reddish or pink tints. 

 The eyes seem to be less developed than in A. pidcher, 

 the hemispherical refracting portion not so constantly 

 present. The situation of those portions of the ganglia 

 which communicate with the exterior by the ciliated duct 

 is moreover different from what it is in A. pulcher. They 

 are situated before the cerebral lobes instead of behind 

 them and connected with them by commissures. • 



30. Amphiporus duhius n. sp. 



Three specimens were examined , all agreeing in the 

 following characters. Ground-colour a yellowish brown 

 with very small equidistant darker grains. At first sight 

 four eyes appear to be present which however show to be 

 four groups of eyes containing 2 or 3 eyes each. A re- 

 Notes irom. the Ley den lytuseum. 



