1805.] ilR. F. E. BEBDARD 0>" XEAV EARTHWOltMS. 219 



The setae are strictly paired aateriorly ; posteriorly the_y diverge 

 slightly from each other, as is the case with AcanthodrUus platy- 

 urus ; but the divergence is by uo means so marked as iu that 

 species. 



The clitellum occupies segmenis xiii.-xvi. 



The dorsal pores are quite obvious, commencing at any rate on 

 xii./xiii. 



The gizzard occupies two segments, vi. and vii., the septum 

 being present. 



The septa dividing segments viii./\ii. are thickened, but not 

 much. 



The last heart is in segment xii. 



The sperm-sacs, as in so very many species, are in xi., and race- 

 mose. 



The spermathecfB are longish and of a reddish colour ; the 

 diverticulum is considerably shorter than the pouch. 



The spermiducal glands are not very long or much coiled ; they 

 are also reddish in colour. The peuial setfe are brown, a colour 

 which is, according to my experience, rare in AcanthodrUus. Their 

 form hardly differs from that of Aca)Uhodrilns plati/urus. 



Hah. yt. 39, Teja Island, Valdivia. 



This species is clearly a close ally of AcanthodrUus ijlatjiurKs. 

 The most ready way of distinguishing them is by the form of the 

 sperniathecse. If it were not for the different position of the last 

 heart I should have been inclined to regard the present species as 

 merely a variety of AcanthodrUus platytirus. Three specimens 

 from St. 48, Corral, appear to belong to the same species, but they 

 are very much paler iu colour. The spermathecte haAe the same 

 red colour and its diverticulum is similar. Possibly a larger series 

 of specimens would allow of the separation of the two forms. 



(8) AcanthodrUus cingulatus, n, sp. 



Of this species five or six individuals were collected by Dr. 

 Michaelsen. 



The largest of them — the only one that was fully mature — 

 measured 58 mm. in length by 4 mm. in diameter; the number of 

 segments 106. 



The worm is darkly pigmented, but the colour is more brown 

 than purple. 



The setse are strictly paired and do not show any signs of 

 divergence from each other at the tail end of the body. 



The prostomium is continued by furrows over the buccal seg- 

 ment. 



The clitellum is unusually far back for the American members 

 of this genus ; it extends from segment xiv.-xviii. inclusive. 



Dorsal pores are obvious. 



There is a large gizzard in segments vi., vii. 



The spermatheca; are oval pouches \\ith a smalHsh diverticulum 

 not one-half of the length of the pouch. 



