1887.] 
Mr Frank E. Beddard on Earthworms. 
171 
same colour as the ventral surface ; the clitellum also is distinguish- 
able on the dorsal surface by its yellowish tinge. 
It is interesting to note that the colour of this species is exactly 
that of a species of Perionyx , from the Philippine Islands, the 
characters of which I have recently described in a paper communi- 
cated to the Zoological Society of London. * 
The preoral lobe does not divide the circumoral segment. 
Dorsal pores are present between all the posterior segments of 
the body; in the four mature individuals the first pore is situated 
between the 5th and 6th segments ; the clitellum is marked 
anteriorly and posteriorly by a conspicuous pore. 
The setce, as in other species of the genus, are disposed in a 
continuous series, occupying the middle line of each segment ; they 
are present on the clitellar segments. 
The clitellum occupies three segments, Nos. 14, 15, 16 ; as in all 
species of Pericliceta it is developed round the whole circumference 
of the body. 
The male and female generative pores are placed in exactly the 
same situation as in other species. The female pore is placed upon 
the 14th segment, within the row of setae in the middle line; the 
male pores are upon the 18th segment, at some little distance from 
each other, also within the row of setae. 
The apertures of the spermathecoe are between 7-8 and 8-9. 
A very striking external character of this worm is caused by the 
great development of genital papillm. 
These are developed on the preclitellar segments (fig. 10), as well 
as on the segments which immediately precede, and on those 
which follow the 18th segment. 
The arrangement of the preclitellar papillae presents some indi- 
vidual variation, which is probably due to the fact that some of the 
specimens are more fully mature than others. 
In one example the papillae were more numerous than in any of 
the others. The 13th segment is furnished with a single papilla in 
the ventral median line; the 11th and 12th segment have each 
three papillae close together, one being median, and the other two 
disposed symmetrically, one on either side; the 10th segment has 
four papillae, of which the middle ones correspond in position to 
* Proc. Zool. Soc., 1886, p. 298. 
