546 OLIGOCHAETA 



(36) Acantliodrilus occidentalis (new species). 



Defiaition. Length, 192 mm.; diameter, 9 mm.; number of segments, 365. Prostomium 

 complete. Setae strictly paired, on ventral surface of hody. Dorsal pores commence at 

 segment XI or XII. Gizzard in VI ; no calciferous glands ; intestine begins in XVII. 

 Last hearts in XIII. Nephridia paired. Testes in X, XI; sperm-sacs in XI, XII: 

 Spermathecae with long tubular caecum. Spermiducal glands occupy one segment only ; 

 penial setae unornamented. Hab. — Valparaiso. 

 This species has an appearance very like that of Octochaetus multiporus. During 



life it had a colour described by Michaelsen as 'blue-grey; head-end rose.' 



(27) Acanthodrilus magellanicus (new species). 



Definition. Length, 66 mm. ; diameter, ^'^mm.; number of segments, about 100. Clitellum, 

 XIII-XVII; genital papillae, a pair on XI, median elongate papillae upon XIV, XV. 

 Setae not strictly paired, ventral nearer than lateral. Gizzard in VI. Septa VI/XII, 

 stout. Last heart in XII. Nephridia paired. Testes in X, XI; sperm-sacs in XI, XII ; 

 spermathecae with two caeca, one above the other ; spermiducal glands, confined to their 

 segment, open separately from penial setae, which are ornamented with transverse ridges. 

 Hab. — Magellan's Straits. 



This species might be mistaken on a first inspection for A. hovei ; it has the 

 same absence of integumental pigment. 



(a8) Acanthodrilus mimitns (new species). 



Definition. Length, 39 mm.; diameter, 3 mm.; number of segments, 70. Clitellum, XIII- 

 XVII. Prostomium complete. Setae strictly paired. Gizzard large; intestine begins 

 in XVII. Testes in X; sperm-sacs in XI; spermathecae with tubular diverticulum; 

 spermiducal glands confined to their own segment, the anterior pair larger. Penial setae 

 not ornamented. Hab. — Putabla, Valdivia, S. America. 

 This species again is one of those that appear to have no integumental pigment, 



which gives to it a superficial resemblance to A. hovei. 



(29) Acanthodrilus bicinctus (new species). 



Definition. Length, 43 mm.; diameter, 3 mm.; number of segments, 80. Clitellum, XIII-XVI; 

 median genital papillae on XX, XXI, XXII, XXIII. Prostomium incomplete. Setae 



