546 OLIGOCHAETA 



(26) Acanthodrilus occidentalis (NEW SPECIES). 



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

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

 segment XI or XI I. 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, 3-5 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. bovei ; it has the 

 same absence of integumental pigment. 



(28) Acanthodrilus minutus (NEW SPECIES). 



Definition. Length, 29 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. Pntabla, 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. bovei. 



(29) Acanthodrilus bicinctus (NEW SPECIES). 



Definition. Length, 42 mm.; diameter, 3 mm.; number of segments, 80. Clilellum, XIII-XVI; 

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



