Benham. — On Neiv Zealand Earthworms. 163 



0*22 mm., and are stouter and more strongly cm^ved than in 

 the preceding species. 



Both these species of Hutton's agree with P. punctata in 

 having 13 couples of chaetae on each side of each seg- 

 ment. Each couple is inserted between two bundles of longi- 

 tudinal muscles, which number therefore 12 on each side, 

 together with a broader dorsal and ventral bundle separating 

 the uppermost and lowermost couples of each side. In the 

 three species — or, perhaps, I ought to say three individual 

 specimens — hitherto examined the chief difference visible in 

 section lies in the width of the median muscle-bundles — i.e., 

 the gap between the right and left couple of chsetse — as well 

 as in the length and proportions of the chsetaa. The posi- 

 tion of the nephridiopores is identical, being between the 3rd 

 and Ith muscle-bundles, or between the 9th and 10th muscle- 

 bundles counting from below, for the pores alternate in posi- 

 tion as in so many of the Acanthodrilids.* 



With regard, then, to these two individuals described 

 by Hutton, there is no doubt that M. lineatus is distinct from 

 my species, while I am uncertain about M. sylvestris, and if 

 further research — upon which I am now engaged — shows that 

 it is identical with P. punctata, Hutton's specific name will 

 have to replace that given by me. 



For the present we may summarise the types as fol- 

 lows: — 



1. (?) Acanthodrilus uliginosus, Hutton. 



Syn. Liimbricus ttliginosus, Hutton. 



2. (ci.) Neodrilus monocystis, Beddard. 



Syn. Lu7nhricus campestris, Hutton (in part). 



(b.) Lumbricus rubellus, Hoffmeister. 



Syn. L. campestris, Hutton (in part). 



3. (a.) AUolotoophora caliginosa, Savigny, 



Syn. Lumbricus levis, Hutton (in part). 



(b.) Octochsetus levis, Hutton. 



Syn. Lumbricus levis, Hutton (in part). 



4. Allolobophora foetida, Savigny. 



Syn. Lumbricus annulatus, Hutton. 



5. Plagiochaeta sylvestris, Hutton. 



Syn. Megascolex sylvestris, Hutton. 



6. Plagiochaeta lineatus, Hutton. 



Syn. Megascolex lineatus, Hutton. 



* Vide pi. XV., fig. 17, loc. cit. 



