DESCRIPTIONS OF GENERA AND SPECIES 431 



(69) Perichaeta elongata, PERKIER. 



P. elongata, PERRIER, Nouv. Arch. Mus., 1872, p. 124. 

 Megascolex elongatus, VAILLANT, Annel^s, p. 81. 



Definition. Length, 355 mm. Clitellum, XIV XVI. One pair of spermathecae in VI. 



Had. Peru. 



Insufficient though the data given by PERRIER about this species are, the number 

 and position of the spermathecae appear to distinguish it. 



(70) Perichaeta quadragenaria, PERRIEB. 



P. quadragenaria, PERRIER, Nouv. Arch. Mus., 1872, p. 122. 



Megascolex quadragenarius, VAILLANT, Annele's, p. 81. 



Definition. Length, 210 mm. ; number of segments about 100. Clitellum, XIV-XVI. 

 Setae, 40 in number on some of segments. Spermathecae, one pair in VII. Hob. 

 E. Indies. 



(71) Perichaeta falcata, HORST. 



P. falcata, HORST, Notes Leyd. Mus., xv, 1893, p. 316. 



Definition. Length, 120 mm. ; 60 setae to anteclitellian segments. Clitellum without setae. 

 Dorsal pores begin behind clitellum. Spermathecae in VIII, IX with diverticulum as 

 long as pouch. Spermiducal gland with dilated terminal sac. Hab. Flores. 



(72) Perichaeta variabilis, HORST. 



P. variabilis, HORST, loc. cit., p. 319. 



Definition. Length, 1 60 mm. ; 54 setae in segments in front of and behind clitellum. 

 Clitellum without setae. Male pores separated by eight setae. Dorsal pores begin 

 behind clitellum. Spermathecae in VIII, IX with long coiled diverticulum. Sperm-sacs 

 in XI, XII. Hab.~~Soemba. 



This species is named on account of its variability; the Spermiducal gland was 

 found in three of the four specimens examined to be very feebly developed as in 

 the majority of the Japanese Perickaetae. The diverticulum of the spermathecae 

 also differs in length. 



