DESCRIPTIONS OF GENERA AND SPECIES 413 



that the individual with more setae upon the clitellum was less mature than the 

 one with fewer setae ; but if there were so there is no agreement with the number of 

 genital papillae. The individual with the most complicated arrangement of papillae 

 has not so many setae upon the clitellum as an individual with fewer papillae. It 

 might be urged that the differences here enumerated are of specific value. This may 

 be so ; but in the meantime there are not sufficient specimens known to enable us to 

 decide the point. 



(25) Perichaeta tokioensis, BEDDARD. 



P. tokioensis, BEDDARD, Zool. Jahrb. Bd. vi, 1893, Abt. f. Syst., p. 762. 



Definition. Length, 62 mm. ; breadth, 6 mm. ; nuniber of segments, 67. Clitellum XIV- 

 XVI, without setae. Male pores conspicuous; near to them, and to the inside are 

 two or three small apertures with corresponding glands. Male pores 5 mm. apart 

 Intestine begins in XV. No specially thickened septa. Hearts in X-XIII. Spermathecae 

 in VII, VIII ; on VIII, IX are a pair of papillae to the inside of spermathecal pores. 

 Sperm-sacs in XI, XII, not very large. Spermiducal glands well developed extending 

 through segments XVII-XX ; very lobulate. Hab. Japan. 



This species is remarkable among the Japanese Perichaetidae in that it has well- 

 developed spermiducal glands ; the only other species which agrees with it in this 

 are P. sieboldi, P. japponica, and P. schmardae. The stalked glands in connexion 

 with the anterior set of papillae seem to vary somewhat in arrangement. I infer 

 this, although I have only had a single specimen to examine, from the fact of their 

 asymmetrical arrangement in this specimen. This is the way in which they were 

 disposed. On the left side of the body two or three glands open on to the papilla 

 of the eighth segment ; on the next segment one gland opens on to the papilla and 

 another on to the stalk of the spermatheca. On the right side of the body a single 

 gland corresponds to each papilla, and another pair unite to open close to if not in 

 common with the spermathecae of segment viii. 



This species may be the same as HORST'S P. schmardae. I retain my own 

 name, however, as this identification is not certain. The brief notes given by 

 MICHAELSEN (10, p. 27) upon the same species are not against this identification. 



(26) Perichaeta nipponica, BEDDARD. 

 P. nipponica, BEDDARD, loc. cit., p. 760. 



Definition. Length, 100 mm.; breadth, 4 mm.; number of segments, 100. Clitellum XIV- 

 XVI, without setae. Male pores separated by fourteen setae. Intestine begins in XVI. 



