THE GENERA OF NEMERTEANS. 223 



fractory hemisphere is present in each of the eyes. Respi- 

 ratory lobes neither before nor behind the cerebral ganglion 

 but on a level with it. Ciliated canal rather short. 

 Stylet truncated behind , very much resembling that of 

 Oerstedia vittata which will be described further on. The 

 transverse respiratory groove runs between the anterior and 

 posterior group of eyes ; the latter group seems to be 

 situated above the respiratory lobe of the ganglion. 



31. Amphiporics marmoratiis n. sp. 



Synon.?? Cosmocephala cordiceps (Sars) Jensen. 



The form of the stylet in the proboscis, the colour and 

 the presence of a longitudinal groove on the head are the 

 differences which separate this species from the foregoing. 

 The handle to the central stylet is posteriorly provided 

 with two short, winglike appendages , probably in accordance 

 with the insertion of muscles. These two wings are not 

 always easily visible, they often give to the basis of the 

 stylet , when viewed sideways, a crooked or bent appearance. 



The colour in young specimens is a dark rufous brown, 

 which in larger specimens becomes marbled with darker. The 

 number and disposition of the eyes is very similar to what 

 is found in A. pulcher. The longitudinal furrow mentioned 

 above is not deep but provided with a series of longer hairs 

 besides the ordinary cilia. It seems to be double , or at 

 least provided with a median protruding ridge. Ventrally 

 it commences before the mouth, passes across the tip of the 

 snout on to the back , where is can be traced a good 

 way behind the transverse respiratory furrows. 



I am greatly inclined to think that the specimen des- 

 cribed by Jensen and Sars under the name of Cosmocephala 

 cordiceps belongs to this species. If once a more detailed 

 anatomical investigation will have shown the atlantic and 

 mediterranean species to be identical, the genus Cosmoce- 

 phala nmst again disappear from among the European 

 Nemerteans. As it is, Sars' description does not allow of 

 the immediate identification of the two species. 



JVoies ironi the Leytlen Mviseum. 



