126 Mr. F. E. Beddard on the 
in Megascolex cingulatus, wpon the intersegmental grooves 
XVil./xvill. and xvui./xix., but appear to be rather different 
in position, in so far as they are not precisely above and below 
the genital pore, but both outside of it. 
(6) Pericheta viridis, Schm. 
Perichata viridis, Schmarda, Neue wirbell. Thiere, Bd. i. Hiilfte ii. p. 13. 
Megascolex viridis, Vaillant, Annelés, p. 87. 
Beyond stating that this species is a true Perichetu I have 
no further observations to offer about it. None of the speci- 
mens were mature, and no distinctive characters could there- 
fore be drawn up. 
(7) Pontoscolex arenicola, Schm. 
(Pl. VII. figs. 3 and 6.) 
Pontoscolex arenicola, Schmarda, Neue wirbell. Thiere, Bd. i. Halfte i. 
p. 11 (in part). 
Pontoscolex arenicola, Vaillant, Annelés, p. 198 (in part). 
Under the same name Schmarda has confounded two per- 
fectly distinct species, which should perhaps be referred to 
two distinct genera. As I have no means of knowing which 
specimen served as the type of the species, I shall regard 
those individuals with a clitellum consisting of eight seg- 
ments as representing the species Pontoscolex arenicola, the 
others I shall call Diacheta littoralis. They have all the 
same habitat, occurring upon the seashore in the neighbour- 
heod of Kingston and Port Royal, in Jamaica. 
I suggested myself * a short time since that Pontoscolex 
might prove to be Pontodrilus, which I have received from 
Bermuda, where it is also found upon the seashore. This 
supposition proves to be incorrect. ‘The genus is in fact, as 
Schmarda’s figure would lead one to believe, identical with 
Urocheta; one of the two species at least is referable, in my 
opinion, to that genus. ‘The others, those with a more exten- 
sive chitellum, may perhaps be more suitably placed in 
Benham’s genus Diacheta. 
Schmarda’s diagnosis of the genus is as follows :— 
“ Quatuordecim series setarum alternas binas. Clitellum. 
Maricole.” 
In the figure illustrating this species the clitellum appears 
to be shown in a very unusual position, @. @. nearer to the 
posterior than to the anterior extremity. It is true that it is 
% 6 Abstract of some Investigations into ae se eeoure of the Oligo- 
cheeta,” Ann, & Mag. Nat. Hist., "Jan, 1891, p. € 
