192 Tronsactions. 



Consequently the seven species whicli have been attributed to the- 

 genus Plar/iochaeta will be distributed anion^' three genera, belonging to two 

 subfamilies of the family Megascolecidae. 



Hubfam. Acanthodrtlinae. 

 Pkujiochaela Benham . 



P. sylvestris Hutton. 



P. lineatus Hutton. 

 Perieodrilus xMichaelsen . 



P. lateralis Benham. 



P. ricanli Benham. 



P. montanvs Benham. 



P. phinketi Benham. 



8ubfam. Octochaetinae. 

 HoplocharteUa Michaelsen . 

 H. rossi Benham. 



There still remained some doubt as to inuidanus, but, as will be shown 

 below, it is really meganephvic, though the nephridia are very small and the 

 tubule clustei'ed so as to simulate a mici'onephridium. 



The -three species of oaithworm dealt with in this paper have been found 

 only in quite out-of-the-way localities — H. rossi was collected on the western 

 .shore of Lake Te Anau ; P. iiioiitnitus in thick forest, 1,100 ft. above aea- 

 level, between that lake and George Sound : while P. ricardi comes from 

 Resolution Island. Those who are at all familiar with the geography of 

 this ]jart ot New Zealand will recognize the great expenditure of time and 

 money that would be reqiiired to obtain fresh material from such inac- 

 cessible places. This must be the excuse for the poor state of preservation 

 of the material, sent as it was in formalin, and for the attempt to work 

 out the finer anatomical points on such material. 



Note on Hoplochaetella rossi. 

 We take this opportunity of giving a figure of the nephridium of this 

 species, as seen under a dissecting microscope ; it is clearly micronephric, as 

 Benham has already stated. 



I M M I I M I I I I M 



j.'i,i. I. — Hoplochnetelk( /fAs.s/. The niiirom-phvidia of one side of a segment 

 just behind the eliteUnni. n.r. nerve-cord. 



There is a, single series of small looped tubules running along the inner 

 surface of the body- wall, just behind the septum, and lying wholly anterior 

 to the chaetal row. This series starts from a short distance outside the 

 nerve-cord, and reaches almost to the mid-doi-sal line (fig. 1). 



In the posterior region of the body the tubules ai'e smaller and more 

 densely packed. 



