DESCRIPTIONS OF GENERA AND SPECIES 405 



X; intestine with caeca in XX Fill, reaching to XXV. Septa V/VIII, IX/XII thickened. 

 Spermathecae in VI IX, with zigzag diverticulum. Sperm-sacs in XI, XII, latter very 

 large ; sperm-reservoirs in X, XI unpaired. Spermiducal gland with particularly long 

 duct bent upon itself. Hab. Kokareet (Tenasserim). 



(7) Perichaeta birmanica, ROSA. 

 P. birmanica, ROSA, loc. cit., p. 164. 



Definition. Length, 130 mm. ; breadth, 6 mm.; number of segments, 112. Clilellum, 

 XIF-XFI. Male pores on line of seta, 15. Dorsal pores commence, XII/XIII. Setae, 

 70 to each segment. Septa, V/VII thickened. Spermathecae in FI-FIII, with diverticulum 

 consisting of an oval sac containing a much-coiled tube. Sperm-sacs in XI, XII ; sperm- 

 reservoirs? Spermiducal glands occupy three segments; duct bent upon itself. Hab. 

 Rhamo (Irawaddt). 



(8) Perichaeta modiglianii, ROSA. 



P. Modiglianii, ROSA, Ann. Mus. Civ. Geneva, vol. vii (2a), 1889, p. 134. 



Definition. Length, 130 mm. ; breadth, 5 mm. ; number of segments, 105. Clitellum, 

 XIF-XFI. Male pores on line with eighth seta ; on inner side of each aperture a pair 

 of minute papillae, one in front of the other. Setae, 66 in each segment, nearer together 

 ventrally. First dorsal pore, XIF/XF. Gizzard attached by unusually long fibres reaching 

 back to XIF ; intestine begins in XVI. Hearts in XI-XIII. Spermathecae in VI-1X, 

 with long zigzag diverticulum. Sperm-sacs in XI, XII ; sperm-reservoirs in X-XI. 

 Spermiducal glands occupying three segments, with bent duct. Hab. Nias. 



(9) Perichaeta fasciata, ROSA. 

 P. fasciata, ROSA, Ann. Mus. Civ. Geneva, vol. xii (aa), 1892, p. 543. 



Definition. Length, 150 mm. ; breadth, 6 mm.; number of segments, 100. Clitellum, 

 XIF-XFI, without setae. Male pores on line with eleventh seta. Setae, 6070 in 

 spermathecal region, closer ventrally. Dorsal pores commence XI/XII. Caeca in XXVI, 

 reaching to XXII. Septa nowhere much thickened. Spermathecae in Fill, IX, with long 

 and coiled diverticulum. Sperm-sacs in XI, XII; sperm-reservoirs in X, XI; the two last, 

 like the two first, are distinct from each other, but there is a connection between the two 

 of each side of the body. Spermiducal glands with a short straight duct. Hab. Engano. 



