422 FRANK E. BEDDARD. 
It happens that the only species of Earthworms known from 
that quarter of the world belong to the same genus. Mandane 
littoralis of Kinberg from Patagonia has been recently shown 
by Perrier (84) to be an Acanthodrilus. I have myself ex- 
amined an individual of this same species which is contained 
in the National Collection at South Kensington, and can quite 
confirm Perrier’s identification. It follows, therefore, that, 
strictly speaking, the name Mandane should be retained 
for the genus, and the name Acanthodrilus allowed to drop." 
The remaining species is Acanthodrilus georgianus, from 
South Georgia (see Michaelsen, 31). 
The species which I describe here may be identical with 
Acanthodrilus (Mandane) littoralis, but I have no 
means of coming to a certain conclusion ;? as it hardly differs 
from A. georgianus in any characters to which Michaelsen 
has directed attention Irefer it to that species, of which I am 
able to give a rather fuller account than that contained in 
Michaelsen’s paper. The largest individual measures about 
three inches in length. 
The sete are disposed like those of A. multiporus, i.e. in 
four series of pairs with a rather greater interval between the 
two setz of the dorsal pair than between the two setz of the 
ventral pair.® 
The clitellum occupies segments x1v—xvi and a portion of 
segment x111; the boundaries of the several segments were in 
every case quite distinguishable. The median ventral part of 
the clitellar segments lying between the innermost seta of each 
side showed no absence of glandular development. 
The prostomium (fig. 22) has the shape illustrated in the 
figure ; it does not divide completely the buccal segment. 
1 Since writing the above, I find that Kinberg used the name Mandane 
twice in the same paper! Vaillant has called attention (‘Suites 4 Buffon,’ 
** Annelés”’) to this flagrant case of disobedience to the rules of nomenclature. 
2 If the specimen in the British Museum be really Mandane littoralis 
it is different from this species. 
3 The actual proportion of the distances between the sete are as follows :— 
1]. —1r.=4; lr. — 2r.=22; Ir. —d3r.=3; dr. — 4r.=34; 4r, — 41.8. 
