242 Transactions. 



The clitellum. is usually on segments 14-17, though occasion- 

 ally half 13 and half 18 may be glandular. 



The tubercula pubertatis are not always so numerous as in 

 the type : thus, in addition to a pregenital pair on segment 12 

 (or, as in type, on segment 11), I find three individuals with 

 pairs on the hinder margin of segments 20, 21 ; two with them 

 on 20, 21, and 22 ; one with them on 20, 21, 22, and 23 ; one 

 with only a single pair on 20 ; while the type has them on seg- 

 ments 19, 20, 21, and 22. It is well known that these tubercles 

 are somewhat variable, and it is not quite certam that degree 

 of maturity is necessarily correlated with the number of tubercles, 

 for in two of the above instances three or four pairs are present 

 in worms in which the clitellum is not at its maximum of de- 

 velopment. 



I felt inclined to differentiate these new individuals from 

 the type owing to the difference in the position of the pregenital 

 tubercles, but I can detect no other important distinction. 



Loc. — Ruatoki (E. Best). 



5. Rhododrilus similis, n. sp. 



In general appearance this worm might readily be mistaken, 

 at least in the preserved condition, for R. besti, from wh ch, 

 however, it presents certain well-marked differences. I received 

 about twenty specimens. 



Colour. — White, with pale yellow-brown clitellum. 



Dimensions. — Mature worms measure from 140-165 mm. by 

 5 mm., with about 200 segments, which, with the exception of 

 the first six or seven, are annulated, whereas in R. besti the 

 annulation commences on the 5th segment. 



Chcetce. — In the midbody ab = be = cd, approximately (but 

 just behind the clitellum be is about 2ab) ; aa > be ; and dd = 

 Qab. 



As is usual in the genus, the two chsetse a, b begin to approach 

 one another at about the 25th segment, so that in the region of 

 the male pores the couple are quite close together, but they 

 separate again anteriorly. 



The clitellum, (half 13) 14-17, is complete only across 14. 



Genital Pores, &c. — The male pores, in line with ab, are on 

 slight papilla?. 



The tubercula pubertatis have rather an unusual appearance : 

 each is a transverse group or series of glands, visible under a 

 dissecting-lens as a series of translucent dots set on a slightly 

 raised ridge. These tubercula are in the following groups : — 



(1.) A pair on the intersegmental furrow 10/11, in line 

 with ab. 



