NOTES ON ACANTHODRILOID EARTHWORMS. 291 
lips are tumid, and the pores are connected with those on 
Segment xvii by grooves (fig. 2). 
Beddard describes much the same sort of arrangement, but 
states that the grooves from the pores on Somite xv1r extend on 
to Somite xrx. I do not find this extension of the grooves 
backwards. The chetze appear to be absent on Segments 
XVII and XVIII. 
The prostomium is completely dovetailed into the buccal 
segment (fig. 1). 
The most noticeable external feature, besides the position 
of the male pores, is the alternation of the nephridio- 
pores (figs. 1 and 2), a fact which Beddard mentioned, and 
which is known in Acanthrodrilus dissimilis, and other 
species. This “alternation” is not quite regular, as will be 
seen from the following table, the pore being in front of 
sometimes the 4th, sometimes the 3rd or 2nd cheta, counting 
the most ventral cheta as the Ist: 
Somite. Left side. Right side. 
IJ, Nephridiopore in front of . . 4thcheta . . 4th cheta. 
III. a : 4  OLG, 4 . . Worm injured. 
VE: Py, _ “dene ales 3 aaa =, ye anjured. 
VE 7 4 Sel) iar Gse 55 . . ord cheta. 
Vi. 33 it sas ordices Oriana 5; 
Vik. if 5 Sp sob ters: sigeieg] 2UGY 5, 
VIII. 3 95 peated ie as sa 
IX. 5 33 So on omens Oi ee 
xe Fe 5 . totorde cs eee ora s. 
XI. A * BA Fy 5 at Bnd, 
XII. - 3 5 SIT ALAS 2x ee Seu; 
XIII. 5 s peta QE Fe Syrah CG ss 
XIV. 5 3 de OEMs 5 oS sale TO aes 
And so on in regular alternation. A similar alternation in the 
position of the nephridiopores exists in the new genus described 
below. 
INTERNAL ANATOMY. 
There are no specially strong septa (fig. 3). The pharynx 
is covered by masses of glandular cells, as in the common 
earthworm, and resembling those which I described and figured 
