The genera of nemerteans. 229 



not passing by degrees of variation into any of the species 

 before described. 



43. Tetrastemma octopunctatum n. sp. 



Easily recognizable by eight round dark brown blotches 

 placed along the median line of the back at about equal in- 

 tervals from each other, on the green ground colour of 

 the body. The diameter of each blotch is about equal to 

 one fifth of the width of the body. 



The shape of the central stylet differs from that of T. 

 dorsalis , the point is very long and so are the reserve 

 stylets. Several specimens , all differing by the same cha- 

 racter, have come under my notice at different times and 

 have given me the conviction of the specific distinction of 

 this form. 



Genus Oerstedia Quatrefages (Char, emend.). Four eyes, 

 large and well developed as in Amphiporus. Body short and 

 stout; more so than in Tetrastemma. Respiratory lobe of 

 the ganglion in front of the superior lobe with which it 

 is in close connection. 



I have employed this generic name for two species about to be described, 

 although I did not succeed in finding the species which Quatrefages established 

 this genus on, and although Mac Intosh regards these two species as identical 

 with Tetr. dorsalis. I am not prepared either to invalidate or to confirm this 

 identification but prefer using Quatrefages' name rather than establishing a new 

 generic division for species which are at all events nearly related to Quatre- 

 fages' original specimens. However I do not think the sublateral position of 

 the nerve-trunlcs as important a generic character as does the french naturalist. 



44. Oerstedia vittata n. sp. 



Four large eyes with anterior refracting hemispheres 

 placed in a quadrangle. Belly and back yellowish white. 

 Four longitudinal parallel brown bands running along the 

 back are confiuent behind the transverse respiratory grooves 

 in two quadrangular patches which send out two thin 

 brown lines towards the head passing between the poste- 

 rior pair of eyes. 



Notes from the Ijeydeii IMiiseiitn, 



