DESCRIPTIONS OF GENERA AND SPECIES 417 



(35) Perichaeta divergens, Michaelsen. 

 p. divergens, Michaelsen, loc. cit., p. 343. 



Definition. Length, \%o mm.; breadth, 6 mm.; number of segments, lao. Clitellum, 

 XIV-XVI. Setae,, 55 in each segment. Dorsal pores commence in XII/XIII. Intestine 

 with simple diverticula. Hearts in X-XII. Spermathecae in VI-IX, with cylindrical 

 diverticulum as long as the pouch ; on segments VI/VII- VIII/IX three pairs of papillae. 

 The spermMhecal pores get further and further away from the median line from, before 

 backwards. Sperm-sacs in XI, XII; sperm-reservoirs in X, XL Sperm-sacs consist of two 

 parts, a larger lower portion and a smaller dark-coloured part ranging into the hody-cavity. 

 Spermiducal glands absent. Ilab. — Japan. 

 The resemblance of this species to P- masatahae is dealt with under the 



description of the latter. 



(36) Perichaeta grubei, Rosa. 



p. Grubei, Rosa, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 395. 

 P. taitensis, Grube, Anneliden der Novara, pp. ^^, 37 (in part.). 



Definition. Length, <jomm,; breadth, ^mm.; number of segments, xao. Clitellum XIV-XVI. 

 Male pores on eighth seta row ; between them, behind row of setae, are four papillae. 

 Setae, 60 on segment VIII. Dorsal pores commence XI/XII. Spermathecal pores 

 VII/VIII, VIII/IX, on line with eighth seta. Hab.— Tahiti. 



(37) Pericliaeta novarae, Rosa. 



p. Novarae, RoSA, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 396. 

 P. taitensis, Grube, Anneliden der Novara, pp. 36, 37 (in part.). 



Definition. Length, 90 mm.; breadth, ^mm.; number of segments, more than 103. Clitellum 

 XIV-XVI. Male pores on eighth seta line. Spermathecal pores on VII/VIII, wide 

 apart. Setae, about 48 on segment VII. Dorsal pores commence XI/XII. Eab. — 

 Tahiti. 



The species named by Grube P. taitensis has been recently examined by Rosa, 

 who finds that two distinct species were included under this name. As the point 

 has been definitely settled by Rosa, it is a waste of time and space to refer back to 

 Gkube's description. It will be obvious from the above descriptions that Rosa is 

 quite justified in separating the two forms. I would remark, however, that Rosa's 

 description does not entirely fit his figures. He says that the two spermathecal pores 



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