Dr. W. B. Benham on some Javan Perichetide. 49 
The number of chete is 38 on segment xxiii. 
” ” ” 30) ” Vill. 
” ” » # 20 ” 1Ve 
12 2 ll. 
’ ? 
There is a slight dorsal gap, equal to two to three times 
an ordinary gap. 
There are no chetee on the tenth seginent in this specimen ; 
tn one of the others there are but stx at very unequal distances 
on the ventral surface, and tn the third specimen twelve. 
It appears, then, that the cheetee drop out of this segment 
on maturity, a peculiarity hitherto unrecorded amongst earth- 
worms. 
On segment xi. there are fewer chete than on ix. or xii. 
The segments x., xi., xi. are distinctly triannulated, and, 
though scarcely perceptibly larger in the spirit- specimen, it is 
quite possible that they may be larger in life. Such a fact 
has been recorded for P. falcata, Horst *, trom Kast Flores, 
and in the case of P. Slutter?, Horst ts from Billiton ; and 
the same author noted that the tenth segment of P. indica is 
larger than its neighbours. But in no case do I find any 
record of the absence of cheetee on this segment. 
The prostomium is long and narrow and dovetailed into the 
first segment for three fourths of its length. 
The first dorsal pore is between segments xil./xiil. 
The male pore is slit-like, with crenate lips slightly pro- 
jecting, so as to form rather prominent structures; there are 
six cheetee between the two pores. 
The two pairs of spermathecal pores are scarcely visible ; 
they le between segments vii./vill., vill./ix., at about the level 
of the ninth chzta from the ventral mid-line. 
The oviducal pore is as usual. 
Internally the septa vil./ix., ix./x., x./xi. are absent, and 
the gizzard appears to occupy segments vill, ix., and x. 
The pair of intestinal ceeca arise in “segment XXvVi., and reach 
as far forward as xxii. 
The sperm-sacs are, as usual, in xi. and xii. 
The spermathece: are characteristic ; they lie in segments 
vil., ix.; each consists of a nearly globular thin-walled 
sac, opening by a short, thick, muscular, distinct duct at the 
anterior margin of these segments. This duct receives a a long 
twisted diverticulum, which gradually enlarges distally, and 
oO 
here appears shining. On one side this diverticulum lies 
* ‘Notes from the Leyden Museum,’ xv. p. 316, 
T Ibid. vol. xii. p. 234, 
Ann. & Mag. N. Hist. Ser. 6. Vol, xvi. + 
