402 Mr. W. I. Kirby on the 
ments (14-17). Male generative apertures paired, and situ- 
ated upon 18th segment of body, which is always behind the 
clitellum ; genital papillee occasionally developed in neigh- 
bouring segments. Female generative aperture single, and 
within the clitellum upon the 14th segment. ‘Iwo pairs of 
testes, more or less solid and compact, in segments 11 and 12; 
terminal portion of vas deferens on either side connected with 
the duct of a large prostate gland. Copulatory pouches 
varying in number from two to four pairs, and provided each 
with a variously shaped supplementary pouch or pouches. 
Intestine with a cecum on either side in 20th segment*. 
Mecascotex, Templeton. 
Megascolex, Templeton, P. Z.S. 1845, p. 89. 
Pleurocheta, ¥, 4. B., Trans. Roy. Soc. Edinb, vol, xxx. pt. ii. 
Setee arranged in nearly a continuous row round each seg- 
ment, only failing for a short space in the dorsal and ventral 
median lines; clitellum occupying segments 138-20, but not 
developed upon the area which separates the male genital aper- 
tures and papille of one side from those of the other. Male 
genital apertures paired and situated upon 18thsegment of body, 
which is within the area over which the clitellum extends ; 
genital papille two pairs, developed upon boundary-line 
between 17th-18th and 18th-19th segments respectively. 
Female generative pore single or double, upon 14th segment. 
A single pair of testes, branched and racemose, in 12th seg- 
ment; a large prostate gland on either side in 18th segment. 
Copulatory pouches simple and unprovided with any supple- 
mentary pouches; two pairs situated in segments 8 and 9. 
Intestine with no cecum, but with a series of large compact 
glands arranged in fifteen or sixteen pairs, commencing at 
about segment 106. 
XLVII.—On the Hymenoptera collected during the recent 
Expedition of H.M.S. ‘Challenger. By W. F. Kirsy, 
Assistant in Zoological Department, British Museum. - 
THE series of Hymenoptera collected during the voyage of 
H.M.S. ‘Challenger’ is interesting not only on account of 
several apparently new species having been obtained, but because 
* Intwo species, P. Sieboldi and P. musicus, Horst (‘ Notes Leyden 
Museum,’ &c. pp. 192 & 194) describes six of these czeca on each side; 
but in the latter species, at least, they do not seem to be at all regular 
in their presence. 
