416 OLIGOCHAETA 



arising in XXVI. Hearts in segments XI-XIII. Two (or three) pairs of spermaihecae in 

 JJ, Til (VIII); diverticulum stvollen at extremity. Sperm-sacs in XI, XII commuriicating 

 with paired sperm-reservoirs in X, XI. Spermidueal glands large, extending through 

 segments XVI— XXII ; duct not much hent. Hah, — Porto Alegre, Brazil. 

 The setae in this species are stated by Michaelsen to be as many as fifty-nine 



in the middle segments of the body. The presence of dorsal pores was not ascertained. 



There seems to be no pigment in the skin. In the anterior region of the body there 



is a slight dorsal interval between the setae. 



ii^) Perichaeta neoguinensis, Michaelsen. 

 p. neoguinensis, Michaelsen, loc. cit., p. 229. 



Definition. Length, \^o mm.; breadth, ^ mm. ; number of segments, ()/^. Clitellum, XIV-XVI. 

 Male pores close to ventral middle line, separated by nine setae. Setae: VIII, 85; XI, 80; 

 XIX, 6^. Dorsal pores commence XII/XIII. Gizzard in IX, X; intestine [without caeca) 

 begins in XV. Septa V/VIII, X/XII thickened. Hearts in XI-XIII. Spermathecae 

 on VI-IX, opening close together; diverticulum very short. Sperm-sacs in XII, with 

 a sperm-reservoir attached to each. Spermidueal glands limited to eighteenth segment with 

 but slightly bent duct. Hab. — New Guinea. 



In the absence of caeca and in the small spermidueal glands the present species 

 agrees with P. taprobanae; but that species has only a single pair of spermathecae. 



(34) Perichaeta martensi, Michaelsen. 



P. Martensi, Michaelsen, loc. cit., p. zt^z. 



Definition. Length, 155 mm.; breadth, 4 mm.; number of segments, 125. Clitellum, 

 XIV-XVI. Male pores separated by nine setae. Setae occasionally show a faint 

 interruption in dorsal median line ; on XII, 36. Dorsal pores commence XII/XIII. 

 Caeca short, reaching only to twenty-fifth segment. Hearts in XI-XIII. Spermathecae 

 in VI-IX, with a duct as long as pouch; on the top of this duct a diverticulum which gives 

 of an accessory spherical diverticulum ; the junction of pouch and duct is beset with 

 numerous filamentous processes. Spermidmcal glands with a long and slender duct. 

 Hab. — Banka. 



This species is to be defined by its peculiar spermatheca, the structure of which 

 is not entirely cleared up by Michaelsen. There seems to be no pigment in the 

 skin, as the worm is described as of a yellow colour. Is this species really different 

 from P. darnleiensis? See description of latter. 



