50 



THE VOYAGE OF H.M.S. CHALLENGER. 



List or the Stations at which the different Species of Nemertea 



COLLECTED BY THE CHALLENGER WERE OBTAINED. 



A glance at the foregoing table shows that the very large majority of Nemertea were 

 captured in shallow water, and that they may, as a rule, be said to belong to the 

 littoral fauna. The most aberrant new types are the pelagic Pelagoiiemertes, and the 

 genus that has come from the greatest depth. Carinina grata. 



The interesting peculiarity of a strongly developed medullary nerve, which is much 

 less conspicuous in the European species hitherto investigated, occurs in species so widely 

 apart as the waters of Nova Scotia {Cerebratulus medullatus), of Kerguelen {Cerebra- 

 tulus sp. inc. (medullatus?), of New Zealand {Cerebratulus parkeri), and of Japan {Cere- 

 bratulus macroren). 



If we group the species according to geographical distribution, we find as novelties 

 in the American part of the Atlantic — 



Carinina grata, Drepanophorus lankesteri, Cerebratulus medullatus, and Cere- 

 bratidus truncatus. 



