418 OLIGOCHAETA 



of P. grubei are in line with the eighth seta. This statement refers, so far as the 

 figures are concerned, not to that species but to P. novaraej the pores of the former 

 are much more closely approximated than those of the latter, a fact which is, of course, 

 duly noted by Rosa. 



(38) Perichaeta sangirensis, Michaelsen. 



p. sangirensis, Michaelsen, JB. Hamb. wiss. Anst., Bd. viii, 1890, p. 36. 



Definition. Length, 140 mm.; hreadth, 4^ mm.; number of segments, 113. Glitelhim, 

 XIV-XVI. Male pores separated hy about a sixth of the total circumference. Setae, 

 44 in number to each segment in middle of body. Faint gaps. Dorsal pores commence 

 XI/XII. Intestine begins in XIV, with a pair of caeca in XF {?). Spermathecae in 

 VIII, with a slender diverticulum expanded at end. Sperm-sacs in XI, XII communicating 

 with reservoirs in X, XL Spermiducal glands extending through segments XVII-XIX ; 

 duct opening into a terminal sac. Hab. — Sangir. 



(39) Perichaeta ferdinandi, Michaelsen. 



p. ferdinandi, Michaelsen, loc. cit., p. 38. 



Definition. Length, 190 mm.; breadth, 6f mm.; number of segments, 116. CUtellum, 



XIV- XVI. Male pores separated by about one-sixth of circumference of body. Setae 



with faint dorsal gaps, 55 in middle segments, fewer in front and behind and 'at the 



same time larger. Dorsal pores commence XI/XII. Gizzard in VI-VIII {?) ; intestine 



begins in XIV, with caeca in XXVII {?). Septa X/XIV thickened. Hearts in XII-XIV. 



Spermathecae in VII, VIII, each with a diverticulum {or two) shorter than pouch. 



Sperm-sacs in X {?), XI, XII, with sperm-reservoirs in X, XL Spermiducal glands large 



extending through XVII-XIX ; duct- arched with terminal sac. Hab. — Sangir. 



Michaelsen is not certain whether in dissecting the worm he may not have 



accidentally removed one of the two diverticula in those cases where there appeared 



to be only one. The spermathecae lie sometimes in front of, sometimes behind, the 



pores on vi/vii, vii/viii. The ground colour of the preserved specimens is a clear 



brown, the seta lines being white ; on the dorsal surface the colour is purple. 



(40) Perichaeta mandhorensis, Michaelsen. 



p. mandhorensis, Michaelsen, Arch. f. Nat., 1893, p. 341. 



Definition. CUtellum, XIV- XVI . Male pores widely separated. Setae with faintly marked 

 dorsal and ventral gaps; 56 on segment XI. Dorsal pores commence X/XL Intestine 



