DESCRIPTIONS OF GENERA AND SPECIES 415 



five setae on each side. Male pores on a depressed area extending over segments 

 XFII-XIX. A pair of papillae on VII anterior and near anterior border. Setae 44 

 in segments bordering elitellum ; on Til, 60. Spermathecae in VII opening on to 

 papilla, diverticulum two-thirds as long as pouch swollen at exl/rcmity. Spermiducal 

 glands with f -shaped, duct without terminal sac. Hob. — Java. 

 This species is chiefly remarkable foi- its small size ; it is the smallest species known 



with the exception of P. violacea, from which however it is easily distinguishable. It 



appears to be unpigmented. 



(30) Perichaeta hesperidum, Beddabd. 



p. hesperidum, Beddabd, P. Z. S., 1893, p. 169. 



Definition. Length, 105 mm.; breadth, 4 mm.; number of segments, 78. Clitellum, 

 XIV-XVI, without setae. Male pores quite lateral in position, separated by diameter 

 of body. Caeca remarkably small ; typhlosole well marked; large intestine begins in 

 XV. One pair of egg-sacs in XIII. Spermathecae in VII, VIII. Spermiducal gland 

 with very minute terminal sac. Hab. — Barbadoes. 



This species is, in its general appearance, very like P. barbadensis. The characters, 

 however, as described by me are sufficient to distinguish the species. It is, however, 

 possible that we have to deal here with a single species of protean form, the present 

 ' species ' representing one extreme. 



(31) Perichaeta mauritiana, Beddabd. 



p. mauritiana, Beddabd, loc. cit., p. 170. 



Definition. Length, 80 mm.; number of segments, 85. Clitellum, XIV-XVI, the last 

 segment with a few setae. Male pores with three small papillae to inner side. Sperma- 

 thecae in VII, VIII ; diverticulum longer- than pouch, with globular extremity. Two 

 pairs of egg-sacs in XIII, XIV. Spermiducal glands extensive, reaching from XVII— XXII, 

 without terminal sac. Sab. — Mauritius. 



(32) Perichaeta pallida, Michaelsen. 

 p. pallida, Michaelsen, Arch. f. Nat., 1892, p. 227. 



Definition. Length, 125 mm,; breadth, 5 mm.; numier of segments, i)^, Clitellum, XIV-XVI. 

 Male pores wide apart, 2-4 papillae round each pore ; besides these there are a pair of 

 papillae on XIX and two pairs on VII; in some specimens two or three papillae on interseg- 

 mental furrows V/VI atul VI/VII or VII/VIIl. Intestine begins in XIII; caeca present 



