1900.] EAUTHWOTtMS OF THE GEKUS AMYKTAS. 615 



with not long diverticulum ; dorsal in position. Sperm-sacs with 

 long dorsal process. 1 



Hab. Mahe Island ; Madagascar. 



B. Sperinathecae 4 pairs in vi.-ix. 



4. Amyntas cingulatus Vaillant. 



Perichceta cingulata, Vaillant, Ann. Sci. Nat. (5) x. p. 228 (in 

 part), and Mem. Soc. Montpellier, vii. p. 146 (in part). 



P. darnleiensis, Fletcher, Proc. Linn. Soc. N. S. W. (2) i. 

 p. 966. 



P. vaillanti, Beddard, P. Z. S. 1890, p. 66. 



P. martensi, Michaelsen, Arch, f . Naturg. 1892, p. 242 ; id. Abh. 

 Senck. nat. Gres. xxiii. p. 240, and Oligochceta in Semon's Forseh. 

 Beise, v. Lief. i. p. 99. 



P. indica, Horst, Vermes in ' Midden-Sumatra,' p. 4. 



P. eoa, Bosa, Ann. Mus. Civ. Genova, (2) xvi. p. 528 & 

 p. 609. 



P. martensi, Horst, Notes Leyd. Mus. xv. p. 324. 



P. madelince, Benham, Journ. Linn. Soc, Zool. xxvi. p. 219. 



Amyntas padasensis, var. lokonensis, Michaelsen, Jahrb. Hamb. 

 wiss. Anst. xvi. p. 78. 



Perichceta belli, Bosa, Ann. Nat. Hist. (7) ii. p. 286. 



Megascolex cingidatus, YaiWaut, Anneles, 1889, p. 72 2 (in part). 



45-180 mm., 70-125 segments. Setae up to 66 in a segment, 

 10-16 between male pores. Sperm-sacs often with dorsal 

 processes. Spermi ducal glands xvi.-xviii., with straight or 

 S-shaped duct. Diverticula of sperruatheca? not long, often with 

 one or more secondary diverticula. Septum viii./ix. occasionally 

 present, but thin. 



Hab. Java, Sumatra, Celebes, Mentawei, Philippines, Torres 

 Straits. 



It seems to me to be impossible to separate specifically these 

 forms. I point out later that Perichceta indica of Horst (as figured 

 in his account of the worms in ' Midden-Sumatra ') cannot be 

 Perichceta indica of subsequent authors, since it has a large 

 terminal sac to the duct of the spermiducal gland. As far as can 

 be judged, it is, as Horst supposed, the same species as Vaillaut's 

 Perichceta cingulata figured in his plate. From these I cannot 

 differentiate my Perichceta vaillanti in the light of fuller knowledge. 

 The characters of the latter offer no differences from P. madelince, 

 with which Michaelsen, as I think, rightly unites his " Amyntas 

 padasensis, var." As to martensi and eoa, they are doubtless 

 identical with each other. The accessory diverticulum remiuds us 



1 It ia often the case that the dorsal ends of the sperm-sacs have a narrow 

 knob-like projection. It seems to me to be merely a part of the sperm-sac 

 which has not become fully expanded with .semen. In the meantime, however, 

 I mention the character where it has been noted. 



2 Perichceta cingulata of Schmarda is of course a Megascolex, as now defined. 



