426 OLIGOCHAETA 



(56) Perichaeta annulata, HORST. 



Megascolex annulatus, HORST, Notes Leyd. Mus., v, 1883, p. 195. 

 P. annulata, HORST, ibid., xii, 1890, p. 236. 



Definition. Length, 195 mm.; number of segments, 130. Setae about 65 per segment. 



Spermathecae in VII, VIII ', globular, with a slender diverticulum half the length of pouch. 



Spermiducal gland confined to segment XVIII. Hal. Malayan Archipelago. 

 This is not a well-defined species, and, were it not for HORST'S experience of the 

 earthworms coming from this region, I should be disinclined to allow it. As, however, 

 he speaks of it by this name so lately as 1890, in which paper the spermathecae 

 are figured, and 1892 (17), it is probably distinct from the large number of other 

 species coming from this part of the world. 



(57) Perichaeta hasselti, HORST. 



Megascolex Hasselti, HORST, Notes Leyd. Mus., v, 1883, p. 190. 

 P. hasselti, HORST, Midden Sumatra Vermes, 1892, p. 5. 



Definition. Length, "jo mm. ; number of segments, 100. Setae, 70-75 in each segment; on 

 ventral side about 40 stand in a dense row, those more dorsally placed being separated 

 by greater interspaces. Spermathecae in VI, VII, with conical diverticulum half the 

 length of pouch. Spermiducal glands extending over Jive segments (XVII-XXII). Hob. 

 Lebong, Sumatra. 



The most characteristic feature of this species is the crowding together of a number 

 of the setae on the ventral surface of the body ; this aggregation of setae is accom- 

 panied by a thickening of the circular muscles. The position of the spermathecae is, 

 perhaps, not correctly stated in the above diagnosis, as HORST puts the sperm-duct 

 funnels as being in segments xi, xii, which is, of course, unlikely. The lobed spermiducal 

 glands are compared by HORST to the lobed kidney of a seal. These glands, the 

 spermathecae, and a section through the body-wall, showing the crowded setae and 

 the thickened circular muscular layer, are figured by HORST. 



(58) Perichaeta japonica, HORST. 

 Megascolex japonicus, HORST, Notes Leyd. Mus., v, 1883, p 192. 



Definition. Length, 220 mm. Male pores situated on a long groove of the shape of a J, 

 which extend,* over segment XVIII ami a part of XVII. Number of setae in each segment, 



