Earthworms from Celebes, 439 



may be spoken of as compact; it is relatively thick. The 

 duct is short, straight, and thick. 



The septa between segments x./xi., xi./xii., xii./xiii., 

 xiii./xiv. are very stout; the next two are also moderately 

 thick. The following septa are quite thin and present peculiar 

 liouchings above the dorsal vessel (PI. XXI. fig. 3e). 



The septum xvi./xvii. has on its anterior face a thin- walled 

 sac lying in segment xvi. — that is, in the segment in front ; 

 this sac communicates by a wide opening with segment xvii. 

 — that is, with the segment behind the septum. Each sac is 

 slightly lobed or sacculated, and contains, but is not filled 

 by, a coagulum. Each of the following septa has a similar 

 pouch upon it. Segment xvi. also contains, attached to its 

 anterior septum, two long pyriform sacs, which are, on further 

 examination, seen to be due to the bifurcation of a single 

 pouch which communicates with the anterior segment, *. e. 

 segment xv. 



Beddard has described in AcanthodrUus faldandicus a 

 somewhat similar condition, and in his Monograph groups 

 these pouches of the septa witli the solid structures attached 

 to septa of Perichceta indica^ and with other structures occur- 

 ring at the sides of the dorsal vessels in certain otlier species, 

 e. g. P. Dyeri. 



The vascular system shows no differences from that 

 described above. 



The ceecum is notched and digitate to the same extent as 

 in P. digitata, but the secondary caeca are more irregular in 

 size, shape, and mode of origin (PI. XX. fig. 3 c). 



Tlie close approximation of the male pores recalls the 

 most striking external generic character of Perionyx ; but it 

 is not quite unique in the genus Perichceta, since it occurs 

 also in P. violacea, from which the present species differs in 

 the number of spermathecte. There can be no doubt that 

 P. jamjjeana, P. diyitata, and P. bonlhainensis axQVQYy c\osn[y 

 allied — a fact evidenced alike by the size, notable amongst 

 Pericheetes, and the extensive digitation of the cgecum. 



The species may be diagnosed as follows : — 



Bluish grey (?) ; measures 280x17 millim. ; 107 segments. 

 Male pores as transverse slits on prominent rounded 

 area, embracing elongated oval papilla in front of the 

 pore. Three papillaj symmetrically arranged in a 

 row in front of the chajtai on each of the segments xvii., 

 xix., XX. Only three chaitai between the porophores. 

 Two pairs of spermathecaj in viii., ix., opening ante- 

 riorly ; sac ovate, short duct receiving an undulated 



