EEPOET ON THE NEMEETEA. 51 



Off Marion Island : 



Amphiporus marioni, Cerebratulus longifissus. 



Off Kerguelen : 



Amphiporus tnoseleyi, Cerebratulus corrugatus. 



Off New Zealand : l 



Eupolia giardii, Eupolia australis, Cerebratulus parTceri, and Cerebratulus 

 angusticeps. 



Off Japan : 



Eupolia nipponensis and Cerebratulus macroren. 



It might Lave been expected that a collection of Nemertea from different parts of the 

 globe, preserved in spirit, would prove to be less valuable for our intimate knowledge of 

 genera and species, and for our elaboration of the systematic arrangement of this group, than 

 it would be for anatomical and histological purposes. Where external specific characters 

 have come to be totally effaced, the details of the internal framework remain most per- 

 fectly preserved for microscopic investigation. In the preceding pages we have encoun- 

 tered difficulty in attempting specifically to determine the fragments forming this 

 collection, and we have at the same time seen that only in four cases (Eupolia 

 delineata, Drepanophorus rubrostriatus, Drepanop>horus serraticollis and Cerebratidus 

 corrugatus) coincident with extraordinarily favourable circumstances, was identification 

 possible with species already known. 



That nevertheless new species could be established with certainty must merely be 

 ascribed to the fact that the distinguishing internal specific characters, gathered by means 

 of microtomy, were so marked and so divergent. Still we cannot picture to ourselves 

 the appearance of these new species when alive and in the fresh state. 



As just noted, we have in this collection a much more reliable basis for the 

 study of the anatomical and histological details. We must, indeed, recognise that we 

 have to thank the exceedingly well-preserved collection of Challenger Nemertea for 

 several new facts and suggestive results, to the description of which we will now devote a 

 new chapter. 



1 Mention is made in M'Intosh's Monograph (XIX., p. 96) of a New Zealand Nemertean, distinguished by Baird as 

 Lineus novx-zelandix. I have nowhere been able to find any description of this species by that author. After personal 

 inspection of Dr. Baird's specimen, which is preserved under that name in the British Museum, I do not, however, feel 

 justified in identifying with it any of the Challenger specimens from New Zealand. Externally it much more resembles 

 Cerebratulus corrugatus, and if this latter species is really encountered in New Zealand, Baird's name will have to be 

 dropped altogether. 



