404 OLIGOCHAETA 



responding in position to male pores ; in front of posterior and behind anterior of these 

 a sucker ; on XVIII a pair of papillae to inside of male pores and in front of line of 

 setae. Setae 80-90 behind clitellum, fewer in front, diminishing forwards. Dorsal pores 

 commence XIII/XIV. Septa V/VII, X/XII thickened. Hearts in X-XIII. Spermathecae 

 in VI-IX; papillae on VII, VIII. Spermiducal gland, with horseshoe-shaped duct. 

 Hab.Billiton. 



(4) Perichaeta enganensis, ROSA. 



P. enganensis, ROSA, Ann. Mus. Civ. Genova, vol. xii (aa), 1893, p. 546. 



Definition. Length, 170 mm. ; breadth, 7 mm. ; number of segments, 140. Clitellum, 

 XIV-XVI, without setae. Male pores on line with seta, 8, 3 mm. apart. Setae, 80 on 

 segment IX, closer ventrally. First dorsal pore, XII/XIII. Caeca in XXVI, reaching to 

 XX. Septa VIII/X absent; none specially thickened. Spermathecae in VI-IX; 

 diverticulum swollen at end, longer than pouch. Sperm-sacs in XI, XII ; sperm-reservoirs 

 in X, XL Spermiducal gland with short duct. Hab. Engano. 



Of this species ROSA describes a variety which he has called ' Tetra.' The variety 

 is much darker in colour than the type, being of an uniform black brown ; the sperma- 

 thecae also are different in that the pouch is quite distinct from its long duct. 



(5) Perichaeta carinensis, ROSA. 



P. carinensis, ROSA, Ann. Mus. Civ. Genova, vol. x (za), 1890, p. 107. 



Definition. Length, 200 mm. ; breadth, 7 mm. ; number of segments, 150. Clitellum, 

 XIV-XVI. Male pores on line with seta, 15. A pair of genital papillae on XVIII 

 between male pores, but a little anterior to line of setae, while male pores are behind 

 line of setae. Setae, 60 per segment in region of Spermathecae. Dorsal pores commence 

 XI/XII. Septa VIII/X absent; none are mentioned as specially thickened. Hearts in 

 X-XIII. Spermathecae in VII-IX; diverticulum shorter than pouch. Sperm-sacs in 

 XI, XII, the last pair much larger, extending through several segments. Spermiducal 

 gland occupying three segments, with long duct. Hob. Mount Carin (1,100 m.), Surmah. 



(6) Perichaeta feae, ROSA. 



P. Feae, ROSA, Ann. Mus. Civ. Genova, vol. vi (aa), 1888, p. 161. 



Definition. Length, 360 mm. ; breadth, 8 mm. ; number of segments, 160. Clitellum, 

 XIII-XVII, with setae. Male pores on line with fifteenth, seta. Setae, 100 in 

 spermathecal segments. Oesophagus with a circle of glands (calciferous glands?) in 



