DESCRIPTIONS OF GENERA AND SPECIES 405 



X; intestine with caeca in XXVIII, reaching to XXV. Septa V/VIII, IX/XII thicJcened. 

 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 v,pon itself. Hah. — Kokareet [Tenasserim). 



(7) Perichaeta birmanica, Rosa, 

 p. birmanica, Rosa, loc. cit., p. 164. 



Deflnition. Length, 130 mm.; breadth, 6 mm.; number of segments, 113. Clilellum, 

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

 JO to each segment. Septa, V/VII thickened. Spermathecae in VI-V III, 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. — 

 Bhamo [Irawaddi). 



(8) Perichaeta modiglianii, Rosa. 



p. Modiglianii, Rosa, Ann. Mus. Civ. Genova, vol. vii (aa), 1889, p. 134. 



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

 XIV-XVI. 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, XIV/XV. Gizzard attached by unusually long fibres reaching 

 back to XIV ; intestine begins in XVI. Hearts in XI-XIII. Spermathecae in VI-IX, 

 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. Genova, vol. xii (aa), 189a, p. 543. 



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

 XIV-XVI, without setae. Male pores on line with eleventh seta. Setae, 60-70 in 

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

 reaching to XXII. Septa nowhere much thickened. Spermathecae in VIII, 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. 



