454 
Proceedings of the Royal Society 
A subsequent paper by Duges * considerably augments tbe num- 
ber of species. In that paper (p. 23) tbe author states that 
L. complanatus agrees with A. gigas in possessing seven pairs of 
copulatory pouches and four pairs of vesiculse seminales. For this 
reason I am inclined for the present to regard the species to be 
described in the present note as identical with L. complanatus ; it 
differs from A. gigas as described by Duges (1) in the distribution 
of the setae, and (2) in the position of the clitellum. In L. gigas 
the setae of the two pairs are closely approximated together, while 
in L. complanatus they are rather more widely separated. The 
arrangement of the setae in L. complanatus is figured in the first of 
the two memoirs referred to, and corresponds, so far as I can make 
out, exactly with the species studied by myself; the two setae of 
the ventral pairs are rather further apart than those of the dorsal 
pair. The clitellum in my species extended from segments 28-38, 
occupying therefore 10 segments. Dug&s states that in L. com- 
planatus the clitellum extends from 29-39, which, as he counts the 
buccal lobe as a distinct segment, is precisely the same; in L. gigas , on 
the other hand, the clitellum occupies 22 rings, ending with the 53rd. 
In Hoffmeister’s Familien der Regenwurmer three species are 
mentioned in which the clitellum occupies about the same segments 
as in A. complanatus , L. stagnalis (apparently identical with A. 
planatus) is one species; the other two are A. agricola ( = A. terres- 
tris, Enterion herculeum ) and A. riparius ( = A. odcedrus , chloroticus, 
virescens , anatomicus) ; in all these, however, the setae of each pair 
are very closely approximated, and, moreover, except in A. agricola , 
the segments contained in the clitellum are not more than nine ; so, 
at any rate, does it appear from Duges’ table of classification of the 
species in the second of his two memoirs referred to. 
Dug&s does not give an elaborate account of the generative 
apparatus in A. complanatus , merely remarking that there are four 
seminal vesicles and seven pairs of copulatory pouches. 
In the specimen before me there are four seminal vesicles on each 
side of the body, occupying apparently segments 8-11 ; they are ap- 
proximately of equal size and rounded in shape, firmly attached to 
the mesentery dividing these segments. The copulatory pouches 
have an arrangement rather different from that figured by Duges in 
* Loc. cit., t. xv. pi. ix. fig. 25. 
