Penial setae 



71 



referred to it. The three species may be distinguished by the following 

 characters : 



1 pair of spermatkecae ' M. cingulatus Schmarda 



(Ceylon). 

 3 pairs of spermathecae M. armatus Beddard 



(Madras, Calcutta, Mandalay, Singapore, Sumatra). 



No penial setae M. coeruletis Templeton. 



(Ceylon). 



19. Megascolex armatus Beddard. 



Sumatra: Padang, 10 specimens. 



This species is very well known by the descriptions of Beddard l ) 

 and Rosa 2 ). 



The largest of our examples measures about 125 mm. in length. 



The cephalic lobe is obtusely triangular, and extends with a 

 narrow appendix over about half the length of the buccal segment 

 (PI. Ill, fig. 31). In specimens, in a state of sexual maturity, the 

 papillae , bearing the male pores , are surrounded by an oval glandular 

 area, in which a crescentic groove in front of and behind each pa- 

 pilla is visible (PI. Ill, fig. 32). In the segments directly preceding the 

 clitellum I found 44 setae, but this number decreases in the anterior 

 and posterior segments. There is a broad median ventral gap in the 

 row of setae, about thrice as broad as the dorsal gap; the latter one 

 measures one and a half of the interval between the neighbouring setae. 



The first dorsal pore lies in the intersegmental groove XI/XII, as 

 stated by Rosa ; when Beddard in his description of M. cingulatus 3 ) 

 says „dorsal pores commence, as in M. armatus between segments V 

 and VI", this must be a mistake. 



There are in this species - as first pointed out by Rosa and sub- 

 sequently confirmed by Beddard 4 ) — in the segments succeeding to 

 that containing the male pores , a pair of large , coiled nephridia , pro- 

 vided with an internal ciliated funnel, but without external aperture ; 

 moreover the numerous tufts of nephridial tubules, characteristic for 

 the Perichaetidae , are also present; in the anterior segments they 

 are scattered about irregularly over the body- wall, in the posterior 

 ones I found them more confined to the neighbourhood of the inter- 



1) Ann. a. Mag. Nat. Hist. 1883, p. 216, PI. VIII, fig. 5—7. 



2) Ann. Mus. Civ. Stor. Nat. Genova, Sér. 2, Vol. VI, 1888, p. 159. 



3) Loc. cit., 1892, p. 122, PI. VII, fig. 9—13. 



4) Quartl. Journ. Microsc. Science, Vol. XXIX, p. 266. 



