DESCRIPTIONS OF GENERA AND SPECIES 433 



spermiducal gland in this species ; in P. operculata of ROSA, which = P. capensie of 

 HORST, the duct is short and straight. 



(77) Perichaeta inflata, HORST. 

 P. inflata, HORST, loc. cit., p. 327. 



Definition. Length, 55 mm. No setae on clitellum. Spermathecae in Fill, IX with a 

 long twisted diverticulum ending in a pyriform dilatation. Spermiducal gland terminating 

 in a sac. Hob. Tijibodas, Java. 



(78) Perichaeta pusilla, UDE. 

 P. pusilla, UDE, Z. wiss. Zool., 1893, p. 63. 



Definition. Length, 16 mm. ; number of segments, 60'. Setae, 40-50 per segment. 

 Twelve setae on last clitellar segment. Male pores separated liy ten setae. Genital 

 papillae paired on XVII and XIX, one on XX. SpermatJiecae in VI with small 

 spherical diverticulum. Ilab. Buitenzorg, Java. 



(79) Perichaeta parva, UDE. 

 P. parva, UDE, loc. cit., p. 64. 



Definition. Length, 25 mm. ; number of segments, 85. Setae, 40-44. First dorsal pore 

 X/XI. Male pores separated by twelve setae. SpermatJiecae in VIII, IX with very 

 long diverticulum which widens gradually and then suddenly narrows, widening again 

 into an oval sac. Hab. Tijibodas, Java. 



Genus PLEIONOGASTER, MICHAELSEN. 

 Syn. Perichaeta, BEDDARD (in part.). 



DEFINITION. Setae forming continuous rows, very numerous (150-160) on some 

 of anterior segments. Clitellum, XIII XVII, with setae. Gizzard in VIII, and 

 three or four posterior gizzards in region of twenty-seventh and following 

 segments ; no caeca. Spermiducal glands lobate, without penial setae. 



The type-species of this genus was described by myself (41) some years ago, and referred 

 to the genus Perichaeta. Later, MICHAELSEN (10) described two other species, which 



1 The single specimen was incomplete. 



3 K 



