DESCRIPTIONS OF GENERA AND SPECIES 423 



Last pair of hearts in XIII. Five pain of spermathecae in V-IX; they arc round 

 and flattened with a long diverticulum terminating in a dilated extremity. Sperm-sacs 

 in XI, XII ; the sperm-reservoirs are in X, XI. Spermiducal glands very lobate 

 extending through three segments. Ilab. Island of Mahe. 



A peculiarity of this species is the arrangement of the spermathecae ; the first 

 three pairs open anteriorly in their segment, the last two posteriorly; it follows, 

 therefore, that segment seven has two spermathecae on each side. This arrangement 

 is found in Allolobophora transpadana, and A. complanana. The large number of 

 spermathecae is only found in P. violacea (of Pericfiaetae, s. s.). 



(51) Perichaeta acystis, BEDDAED. 



P. biserialis, BEDDARD, P. Z. S., 1890, p. 63. 



Definition. Clitellum, X1V-XVI, without setae. Male pores wide apart ; behind them, on five 

 following segments, are papillae occupying a corresponding position. Setae on either side 

 of ventral median line much enlarged. Dorsal pores present. Septa VI-1X, thickened. 

 Spermathecae absent. Hab. Luzon. 



This species, of which I am able to give only an incomplete account, was at first 

 identified by myself with PEKRIER'S P. biserialis ; I do not, however, now think that 

 that supposed identity can be maintained. P. biserialis of PERRIER has two pairs 

 of spermathecae, while the present species has none ; as I examined two specimens 

 the absence of spermathecae can hardly be regarded as accidental. 



(52) Perichaeta forbesi, BEDDARD. 



P. forbesi, BEDDARD, P. Z. S., 1890, p. 65. 

 P. sp., BEDDARD, Zool. Anz., 1889, p. 534. 



Definition. Length, 230 mm.; breadth, iimm. Clitellum, XIV-XVI, with setae on ventral 

 side of all segments. Male pores wide apart; on XVII ami on XIX-XXI are a pair 

 of papillae. Dorsal pores commence XII/XIII. Septa VII/VIII, X/XII, thickened. 

 Sperm-sacs in XII. Egg-sacs in XIV. Spermathecae in VIII, IX. Hab. New Guinea. 



In both of the two individuals of this species which I have examined, one sperma- 

 theca was doubled ; in one case it was the left-hand pouch of the eighth segment ; in 

 the other the corresponding pouch of the next segment. The sperm-sacs appear to be 

 peculiar ; the single pair are attached to the septum xi/xii ; above each of these was 

 a pedunculated sac, attached separately to the septum, and entirely filled with Gregarines. 



