420 OLIGOCHAETA 



Sperm-sacs in XI, XII ; sperm-reservoirs in X, XL Spermiducal glands well developed. 

 Hob. Vera Cruz (Mexico). 



In one specimen MICHAELSEN found an additional pair of spermathecae in vii. 

 The dorsal surface of the preserved worms is brownish with a median purple stripe. 



(43) Perichaeta hawayana, ROSA. 



P. Hawayana, ROSA, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 396. 



Definition. Length, 100 mm.; breadth, 4 mm.; number of segments, 88-95. Clitellum, 

 'XIV XVI. Male pores on ninth seta; close to pore on each side a group of three 

 papillae. Intestine begins in XV ; the two caeca have a pinnate appearance. Septa 

 V/VIII, X/XII are thickened ; septa VIII/IX, IX/X are wanting. Hearts in segments 

 X-XII. Three pairs of spermathecae in VI, VII, VIII ; diverticulum as long as pouch, 

 with a dilated extremity. Sperm-sacs in XI, XII ; they communicate with the sperm- 

 reservoirs of segments X, XI. Spermiducal glands large, extending through seven segments 

 (XVII-XXIII), no terminal dilatation to the muscular duct. Hob. llawai. 



(44) Perichaeta racemosa, ROSA. 

 P. racemosa, ROSA, loc. cit., p. 399. 



Definition. Length, iiomrn.; breadth, 5 mm.; number of segments, 100. Clitellum, XIV- 

 XVI. Male pores in line with seventh seta. Setae 46 in segment VIII. Dorsal pores 

 absent (?). Gizzard in IX (?}. Septa V/VII thickened. Spermathecae in IX, diverti- 

 culum divided at free end into 3-5 globular sacs. Sperm-sacs in XI, XII. Spermiducal 

 glands small, with straight short duct opening into a terminal sac. Hab. Borneo ; Java. 



(45) Perichaeta sieboldi (HORST). 



Megascolex Sieboldi, HORST, Notes Leyd. Mus., vol. v, 1883, p. 191. 

 P. Sieboldii, ROSA, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 401. 



Definition. Length, 270 mm.; breadth, 10 mm. ; number of segments, 135. Clitellum, 

 XIV XVI, without setae. Male pores on line with seta fourteen. Setae, 76-80 on 

 spermathecal segments. Dorsal pores commence XII/XIII. Intestine begins in XV, caeca 

 with six or seven diverticula. Septa in front of segment VIII thickened ; also X/XIV. 

 Hearts in X-XIII. Spermathecae in VII-IX opening on line with seta eighteen; 

 </i<:erticulum zigzag shaped. Sperm-sacs in XI, XII ; sperm-reservoirs in X, XI. Egg- 

 *acs in XIII. Spermiducal glawls with short straight duct. llab. Japan. 



