170 MR. F. E. BEDDARD ON A LARGE EARTHWORM. [ Mar. 16, 
area are bounded by the ventral pair of setz; this area, which is 
distinguished by its very pale colour, surrounds the male genital 
apertures, which are upon the 17th and 19th segments respectively 
(see fig. 2). In A. ungulatus the clitellum extends from 14-17 
inclusive and the male genital apertures are upon the 18th and 
20th segments ; in A. obfusus the clitellum is unknown, the male 
genital pores are upon the 19th and 21st segments. 
Dorsal pores are stated by Perrier to be present in his two species ; 
in my species they are present and commence apparently at the 13th 
or 14th segment ; in one specimen the first dorsal pore was visible 
between the 12th and 13th segments, in a second specimen this pore 
was a segment further back. I have figured these apertures as 
extending over the clitellum, since they were visible on these 
segments in immature examples without a clitellum; when the 
clitellum was present they were apparently absent or, rather, perhaps 
rendered invisible by the swollen glandular integument. 
In Acanthodrilus multiporus (see P. Z.8. 1885, pt. iv. p. 810) I 
observed dorsal pores commencing after the clitellum, the first pore 
marking the posterior boundary of that region of the integument. 
In Acanthodrilus dissimilis and A. nove zelandie they appear to be 
present though very inconspicuous; I only noted them after the 
clitellum. 
In the furrows separating segments 7-8 and 8-9 were a pair of 
distinct rounded apertures corresponding to the inferior pairs of 
sete ; these are the apertures of the copulatory pouches. The pair 
of setee on segment 8 were in most instances greatly modified, 
being much larger and more conspicuous than the other sete of the 
body ; their appearance is very like that of the genital sete on 
segments 17 and 19. 
In describing the structure of the genital organs I shall call 
attention to those setze which correspond to internal structures entirely 
novel in this genus. 
The ordinary setz of the body are distributed in pairs as in other 
species of the genus. 
The apertures of the nephridia are very conspicuous and correspoud 
in every case to the more dorsal pair of sete. 
The female generative pores are displayed in fig. 2; they are a 
pair of very minute pores situated on the 14th segment in front 
of and to the inside of the ventral pair of sete; their position is 
nearly similar to the corresponding pores of A. nove zelandie ; they 
are on the same segment as in that species, where, however, the pores 
are placed in front of the outermost of the two ventral sete. In 
Acanthodrilus capensis I find the female generative pores are upon 
the 14th segment and the ovaries in the 13th segment, and not, 
as erroneously stated in my paper on that species’, in the segment 
anterior to these; in the present species, however, the pores are 
placed in front of the innermost of the two ventral setz. 
Vascular System.—In fig. 7 of Plate XIX. isillustrated the main 
vascular trunks of the anterior region of the body. The dorsal vessel 
1 Proc. Roy. Phys. Soc. 1885-6, p. 369. 
