428 FRANK E. BEDDARD. 
not agree with Barfurth (10), who specially proved its existence 
in the muscles of the Earthworm. The folding of the septa 
which results in the formation of these sacs may therefore be 
caused by the need for an increased amount of glycogen-forming 
tissue. Vejdovsky refers to structures in Rhynchelmis (89) 
and Claparede in Lumbricus which may be comparable to 
these septal sacs. 
Some time ago I described in the ‘ Proceedings of the 
Zoological Society’ (1) three species of New Zealand Acan- 
thodrili; this account was afterwards supplemented by the 
description (4) of a fourth species or variety. These speci- 
mens were kindly collected for me in the vicinity of Dunedin 
by Professor T. J. Parker, F.R.S. Since then Mr. W. Smith 
has forwarded to me a large collection of specimens from 
Ashburton ; the majority of these were Acanthodrilus, which 
is apparently the most prevalent genus in New Zealand ; one 
of them was described by me in a recent number of this 
Journal (3), the others seemed on a rapid inspection to belong 
to the three species, A. multiporus, A. nove-zealandie, or 
A.dissimilis. I find, however, that this is not the case, and 
I therefore proceed to describe the Ashburton species as 
Acanthodrilus antarcticus and A. Rose. 
Acanthodrilus antarcticus, n. sp. 
The sete are disposed in four series of pairs, but the two 
setee of each pair are not close together as in A. nove- 
zealandiz. Sete 1 and 2 are closer together than 3 and 4; 
the distance between 2 and 3 is about equal to that between 
3 and 4. | 
The prostomium does not completely divide the first 
segment ; it does in A. nove-zealandiz. The first dorsal 
pore is between segments v and v1; they are not visible upon 
the clitellum. 
The clitellum, which is distinguishable even in the spirit 
specimens by its darker colour, occupies segments x11 to 
XVII. 
