DESCRIPTIONS OF GENERA AND SPECIES 535 



brown (in. alcohol) verging towards purple on the dorsal surface. Clitellum, XIV-XIX, 

 not developed ventrally upon XVII— XIX. Male pores upon inconspictious papillae ; the 

 two pores of each side connected hy a longitudinal groove. Prostomium completely 

 divides buccal segment. Dorsal pores not seen. Setae paired. Gizzard in VI, VII ; 

 calciferoiis glands in XIV, XV. Intestine begins in XVIII. Septa X/XV slightly 

 thickened. Dorsal vessel as in A. novae-zelandiae ; so too hearts. Nephridia paired 

 and alternate. In neighbourhood of pharynx are well-developed blood-glands. Sperma- 

 thecae with diverticulum terminating in a mulberry-shaped extremity. Hab.- — New 

 Zealand. 

 This species might be confused with A. novae-zelandiae, but for two points of 



difference: (i) the absence of any greatly thickened septa; (a) the stalked character 



of the spermathecae diverticulum. 



(5) Acanthodrilus monocystis (Beddaed). 

 Neodrilus monocystis, Beddaed, P. Koy. Soc. Ed., vol. xiv, p. 157. 



Definition. Length, 70 mm.; diameter, 5-6 mm.; number of segments, 155. Setae strictly 

 paired. Prostomium completely divides buccal segment. Clitellum, XIII-XVII, saddle- 

 shaped. Gizzard in VI ; intestine begins in XV, and has no typhlosole. No specially 

 thickened septa. Last heart in segment XIV. Nephridia alternate. Sperm-sacs in X—XII. 

 One pair of spermvducal glands opening on to XVII, and continued back by a groove 

 on to the following segment ; penial setae beset by minute asperities distally. Spermathecae, 

 one pair in VIII, with a very large diverticulum lying in segment in front. Hab. — 

 New Zealand. 

 I have come to the conclusion that it is not permissible to retain the genus 

 Neodrilus for this species, in spite of its possessing only one pair of spermiducal 

 glands. The species has been investigated, not only by myself, but, in some respects 

 more fully, by Benham (19). The latter paper contains a good series of illustrations. 

 The species evidently comes nearest to A. dissimilis, but it is more slender in 

 appearance, and quite unmistakable, even before dissection. 



(6) Acanthodrilus smithii, Beddaed. 

 A. smithii, Beddaed, P. Z. S., 1893, p. 675. 



Definition. Length, 75 mm.; diameter, 3 mm.; number of segments, 114. Colour {of 

 preserved specimens), violet above. Prostomium completely divides buccal segment. Setae 

 strictly paired, dividing body into equal areas. Clitellum, XIII-XIX, saddle-shaped. 



