DESCRIPTIONS OF GENERA AND SPECIES 411 



(21) Perichaeta dyori, BEDDARD. 

 P. dyeri, BEDDARD, loc. cit., p. 157. 



Definition. Length, 117 mm.; breadth, 4 mm. ; number of segment* "Jl. Colour during life 



a rich dark brown, darker posteriorly. Clitellum XIV-XVI, without setae. Male pores 



are separated by fifteen setae. Two pairs of genital papillae ; one pair in front and 



a little to inside of male pore; the other occupies a similar position behind the male 



pore. The seta formula is: I, 27; V, 27; XII, 39; XXV, 4.5. Caeca arise in 



XXVI, at the posterior margin of this segment and extend to the XXVth segment. 



From segment XXVIII are a series of septal glands. Last pair of hearts in XIII. 



Spermathecae four pairs in VI-IX ; diverticulum half again as long as pouch. 



Sperm-sacs in XI, XII. Spermiducal glands extending through segments XVI-XXI ; 



muscular duct without terminal sac. Hab. Trinidad; Jamaica; Lagos, West Africa. 



I have examined a large number of examples of this species. This examination 



has shown that the characters of the papillae are not always absolutely distinctive 



of the species ; in a good number only one pair (the posterior pair) were present. 



The species is remarkable for its wide range, but there are other examples in this 



genus and in other genera. I have elsewhere remarked upon species which are common 



to Lagos and to the West Indies. 



(22) Perichaeta taprobanae, BEDDARD. 

 P. taprobanae, BEDDARD, loc. cit., p. 163. 



Definition. Length, 100 mm.; breadth, 6.5 mm. ; number of segments, 114. Clitellum 

 XIV-XVI, with complete rows of setae. Male pores separated by seventeen setae. 

 The seta form is: //, 52; VI, 81 ; XIII, 74; XXVI, 67 ; larger posteriorly. Dorsal 

 pores commence XII/XIII. Caeca absent. Septa V/VII, X/XII thickened. Spermathecae 

 in J'lII. Spermiducal glands small, limited to segment XVIII ; no terminal sac. Hab. 

 Ceylon. 



(23) Perichaeta morrisi, BEDDARD. 

 P. morrisi, BEDDARD, loc. cit., p. 166. 



Definition. Length, 52 mm. ; number of segments, 93. Clitellum XIV-XVI ; setae on last 

 segment of clitellum. Male pores not wide apart; minute glands open in neighbourhood. 

 Spermathecae in VI, VII ; on segments VII, VIII a single median papilla in front of 

 line of setae. Spermiducal glands without terminal sac. Hab. Penan;/. 

 I have given a coloured sketch of this species. 



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