DESCRIPTIONS OF EARTHWORMS. 319 
specimen is badly preserved. It is a rather slender worm, 
measuring about 90 mm. in length. The buccal region of the 
oesophagus is everted, therefore the cephalic lobe could 
not be recognized. The clitellum is distinct, without setae. 
The male generative pores are situated upon distinct pa- 
pillae; there are 10 setae between them. On the segments 
XIX, XX and XXI a pair of cub-shaped papillae are visible, 
corresponding to the line of the male pores. External ori- 
fices of spermathecae could not be recognized; neither was 
there internally a trace of these organs to be found. The 
internal structure is as usually. Perhaps this specimen 
must be referred to P. Forbesti Bedd. 5); however this species 
also possesses papillae on segment XVIII. 
Perichaeta variabilis n. sp. 
Eight specimens, collected by dr. ten Kate in the north 
of the island Soemba. | 
A rather thick, stout worm, with a cylindrical body 
of a yellow-brown colour. The length of the largest spe- 
cimen is about 160 mm. The prostomium extends back till 
the half of the buccal segment. The clitellum is distinct, 
showing neither setae nor intersegmental grooves. The 
setae are arranged in a continuous circle, only interrupted 
in the median dorsal line; on the segments in front of 
and behind the clitellum about 54 of them are visible, 
situated upon a prominent ridge. 
There are no copulatory papillae. Two pairs of sperma- 
thecal pores are situated laterally, in the intersegmental 
grooves VII/VIII and VIII/IX; an unpaired oviducal pore 
on segment XIV. 
The male pores on segment XVIII, situated upon dis- 
tinct papillae, lie in the line of the seventh seta from the 
ventral median line; eight setae could be counted between 
both pores. First dorsal pore behind the clitellum. 
These worms present a singular variability in the structure 
1) Proc. Zoolog. Society, 1890, p. 65, pl. IV, fig. 5. 
Notes from the Leyden Museum, Vol. XV. 
