406 OLIGOCHAETA 



(10) Perichaeta aeliana, ROSA. 

 P. aeliana, ROSA, Ann. Mus. Civ. Geneva, vol. xii (za), 1892, p. 545. 



Definition. Length, 100 mm. ; breadth, 6 mm.; number of segments, 120. Clitellum, 

 XIF X VI, without setae. Male pores on line with seta, 4. Setae, 74 to a segment. 

 Dorsal pores commence XII/XIII. Septa, none specially thickened. Caeca in XXVII- 

 XXVIII. Spermatheca in VII IX ; diverticulum unusually long and coiled. Sperm-sacs 

 on XI, XII ; sperm-reservoirs in X, XI. Spermidncal glands with short straight duct. 

 Hob. Engano. 



(it) Perichaeta darnleiensis, FLETCHER. 

 P. Darnleiensis, FLETCHER, Proc. Linn. Soc. N. S. W., vol. i (2), 1886, p. 966. 



Definition. Length, 108 mm. ; number of segments, 155. Clitellum, XIV-XVI, without setae. 

 Male pores, 3 mm. apart, separated by twelve setae. No papillae. Setae, 60-66 per 

 segment. Dorsal pores commence XI/XII. Caeca in XXVI, reaching to XXII. Septum 

 IX X missing; septa V/VIII, X/XIV thickened. Hearts in XXIII. Spermathecae 

 in VIIX; diverticulum with globular diverticula, longer than spermathecae. Sperm- 

 sacs in XI-XII ; sperm-reservoirs in X, XI. Spermiducal glands in XVII-XIX ; terminal 

 sac present at opening of duct. Hab. Darnley Island ; Torres Straits. 



Of this species, as well as of P. queenslandica and P. peregrina, FLETCHER has 

 stated that the oviducal pores are paired. This requires verifying. I am inclined 

 to believe this worm to be identical with P. divergens. The only difference seems 

 to be the number of setae. 



(12) Perichaeta peregrina, FLETCHER. 

 P. peregrina, FLETCHER, loc. cit., p. 969. 



Definition. Length, 130 mm. ; breadth, 5 mm.; number of segments, 108. Clitellum, 

 XIV-XVI, with setae. Male pores separated by fourteen setae. Setae, 40-46 per segment^ 

 most numerous posteriorly. Dorsal pores commence XI/XII. Intestine begins in XVI, 

 caeca in XXVI (XXIII). Hearts in X-XIII. Septa VIII-X absent. Spermathecae in 

 VI IX; diverticulum as long as pouch. Sperm-sacs in XI, Xll ; sperm-reservoirs in 

 X, XL Spermiducal glands smooth with \]-shaped duct. Hab. Mauritius (?). 

 Although this species was met with at Sydney it is believed to have been intro- 

 duced from Mauritius, since it is met with only in conservatories and not in gardens. 



