DESCRIPTIONS OF EARTHWORMS. 327 
lowish colour and is of a hard consistency, as if its wall 
contained chitine; however on traverse sections it appears 
to have a normal structure and its hardness to be only 
due to a secretion, probably coagulated by the influence 
of alcohol. The diverticulum possesses a thick, muscular, 
folded wall. . 
The prostata is a large gland, consisting of numerous 
lobes and extending over segments XVI—XXII; its excre- 
tory duct is longer than it is ordinarily the case with 
Perichaetae and therefore it is curved, as shown in fig. 7); 
the first part of the duct, in which the vas deferens opens, 
near its origine from the prostate, is membranaceous; 
next to the ventral median line, before turning back, it 
passes into the muscular part, which terminates in a di- 
lated sac. The internal structure as usually. 
Two pairs of tongue-shaped seminal vesicles in segments 
XI and XII. There is a bell-shaped gizzard in segments 
VIII and IX; the short conical, intestinal coeca of seg- 
ment XXVI extend over four segments. Three pairs of 
abdominal hearts occupy segments X1, XII and XIII. 
In the shape of the spermathecae and the ventral po- 
sition of their external orifices this worm much agrees with 
P. operculata Rosa (— capensis Horst). However according 
to Rosa’s description this species is distinguished by its 
small cephalic lobe, without posterior appendix, which is 
coalesced with the buccal segment; moreover its prostata- 
duct is short and straight. 
Perichaeta inflata n. sp. 
A single specimen from Tjibodas, collected by Dr, van 
Bemmelen. 
A small worm, measuring only 55 mm. in length. Its 
body tapering at the anterior and posterior end, is of a 
yellowish brown colour; the clitellum is darker. A rather 
large, rectangular prostomium extends back till the half 
of the buccal segment. 
Two pairs of spermathecal pores in the intersegmental 
Notes from the Leyden Museum, Vol. XV. 
