544 OLIGOCHAETA 



(22) Acanthodrilus anneetens, Beddakd. 



A. anneetens, Beddard, Q. J. M. S., vol. xxix, 1889, p. 102. 



Definition. Length, about 75 mm. Colour during life ^ pink, or white and, pink' 

 Prostomium not completely dividing buccal segment. Clitellum, XIII— XIX, saddle-shaped. 

 Male pores in position of seta 2, which is absent, seta i being present. Sperm-duct- 

 pores to the outside of ventral pair of setae. Gizzard in V ; no calciferous glands. 

 Intestine with well-developed typhlosole. Dorsal vessel double ; last hearts in XIII. 

 Nephridia open by outermost setae; the first pair is a ' peptonephridium.' Gonads 

 attached to hinder wall of their segments. Sperm-ducts imbedded in body-wall. 

 Spermathecae each with four diverticula, opening on to exterior in front of and to 

 ventral side of third seta. No penial setae. Hab. — New Zealand. 



This species and the next form a very distinct pair of Acanthodrilus, as will 

 be seen from a comparison • of their characters with those of other species. I have 

 not referred in the above definition to the genital papillae which are present in this 

 as in so many other species of the genus. In one specimen there were a pair lying 

 in line with the ventral pair of setae between segments ix/x ; behind these there 

 was a single median papilla on xv and another on xvi ; in segments xix, xx were 

 three papillae, two on one side of the middle line and one on the other. Another 

 specimen had a papilla on each of segments xviii, xix. 



(23) Acanthodrilus paludosus, Beddaed. 



A. paludosus, Beddaed, P. Z. S., 1892, p. 677. 



Definition. Length, about 25 mm. ; diameter, i mm. Clitellum, XIII-XIX. Setae distant ; 

 the outer setae only of ventral pair on XVII and XIX missing. Male pores correspond 

 in position to missing seta of their segment. Sper?n-duct pores to outside of ventral 

 setae of XVIII. Papillae on XI, XII, and XVIII. Gizzard in V awl VI chiefly in 



, the latter segment ; intestine begins in XX. First pair of nephridia modified to form 

 a peptonephridium. Sperm-ducts run in the thickness of the body-wall, uniting just at 

 external pore. Sperm-sacs in IX, XI, and XII. Spermathecae each with two small 

 diverticula. Penial setae absent. Hab. — New Zealatul (in a marsh). 



This species comes nearest to A. auTiectens ; it differs from it principally in the 



