Benham. — North Island Earthworms. 243 



(2.) Two transverse series, 14/15, 15/16, extending from the 

 line a to a. 



(3.) Two to four pose - clitellar transverse intersegmental 

 series, 19/20, 20/21, 21/22, 22/23. 



Of these the most anterior extends from b-b, the last from a-a. 



Of the seven mature individuals examined, one specimen 

 alone had four post-clitellar tubercles, three had three, and three 

 had only two tubercles. 



There is a single pair of spermathecal pores nearly in line b, 

 between segments 8/9. 



Internal Anatomy. — The last heart is in segment 12. 



The gizzard is in segment 5. The intestine commences in 

 the 16th. There are no oesophageal glands. 



The sperm- sacs are, as usual, in segments 11/12. 



The prostates extend along the sides of the body to segment 

 21 or 22, being sharply undulating in the last two segments. 

 The duct is very narrow, quite short and straight. 



The penial chsetae (and the sacs containing them) are very 

 short, and confined to the 17th segment. The chaetee measure 

 only 2 mm., which is a great contrast to the length of 6 mm. 

 attained by them in R. besti. Each cheeta is simply curved, 

 ending in an apparently flexible recurved tip. The shaft for some 

 distance below the tip is " ornamented " in a very characteristic 

 fashion ; under a low power it appears serrated along each edge, 

 but under a higher power it is seen to be pitted all round. The 

 pits are oblique, with openings distally directed, leaving distally 

 directed proximal edges. 



The spermatheca, in segment 9, consists of a short ovoid sac 

 lying on the outer side, and a long cylindrical portion, curved 

 in a semicircle, towards the median line. 



hoc— Ruatoki (E. Best). 



6. Dinodrilus suteri, n. sp. 



Of this interesting worm three individuals were sent to me 

 by Mr. Suter. 



Colour. — Uniform dark purplish-brown (in alcohol). 



Dimensions. — The largest is 40 mm. by 2 mm., with 110 

 segments. 



The prostomium is half epilobic, without a transverse furrow. 



Chcetce. — The peculiarity of this genus is, of course, the posses- 

 sion of twelve chsetse in each segment ; these are almost equi- 

 distant, and their arrangement differs slightly from that given 

 for D. benhami : be = cd =de = ef ; ab < be < aa ; aa = \\ab ; 

 ef=2ab. 



Clitellum. — Unfortunately the worms are immature, and 



