28o DISCOVERY REPORTS 



those described by Michaelsen in being ornamented distally all round the stem with 

 sparse serrated teeth or scales (Fig. 2 a). Since these stouter setae are definitely stated 

 to be quite smooth, it would appear that these specimens diff'er from the types in this 

 character. 



In all other characters, both external and internal, these specimens are in essential 

 agreement with the types of M. michaelseni. 



Observations. Apart from the possibility that the types are really unpigmented and 

 not merely faded these specimens only differ in the ornamentation of the penial setae of 

 the outer sub-bundle. If these specimens constitute a race peculiar to Hermite Island 

 they should be treated as a subspecies, but it is equally probable that they merely 

 represent a variety not geographically separated from the type. In the absence of 

 evidence to the contrary they have been treated above as representing a distinct sub- 

 species. 



Sectio Chilotacea 

 Genus Chilota, Mich. 

 Chilota bicinctus (Bedd.) (Fig. 2 c-e). 



Acanthodrilusbicinctus+ A.purpureus, Beddard, 1895, Proc. ■^'oo^- ^o^. London, 1895, pp. 217, 218. 



A. bicinctus + A. dalei (part), Beddard, 1896, Ergeb. Hamb. Magalh. Sammelr., Naid. Tiibif. 



Terric, p. 27, figs. 10 and 12, pp. 28 and 39. 



A. pur pur ens y Michaelsen, 1898, Zool. Jalirb., suppl. 4, p. 471. 



Chilota biciricta, Michaelsen, 1899, Ergeb. Hamb. Magalh. Sammelr., Terricolen (Nachtrag), 



p. 17. Hamburg. 



Ch. bicincta, Michaelsen, 1900, Das Tierreich, x, Oligochaeta, p. 148. 



Ch. bicinctus, Michaelsen, 1923, Goteborg. Vetensk-Samh. Handl. (4), xxvn, Afd. 32, p. 4. 



St. 222, St Martin's Cove, Hermite Island, Cape Horn, 23.iv. 27; three clitellate and one 

 immature specimen, also three very immature specimens probably referable to this species; in 

 rather poor preservation. 



Length (two uninjured, clitellate specimens) 74 and 77 mm. 



Clitellum, ^13-16, or ^17 dorsally, 14-16 ventrally. Copulatory papillae apparently 

 absent, but state of preservation does not permit certainty on this point. Dorsal pores 

 absent. Nephridial pores in setal line c, difficult to see. Spermathecal pores, two pairs, 

 at intersegments 7/8 and 8/9 on papillae in setal line b. Prostatic pores, two pairs, on 

 segments 17 and 19 in setal line b on papillae. 



Gizzard in segment 5, small but muscular. Not in segment 7 as described for the 

 types oi " Ac. piirptireus" by Beddard (the condition in the types of Ac. bicinctus is 

 not mentioned). Salivary glands extend into segment 5. Intestine: the position of the 

 first intestinal segment is apparently very variable ; in one clitellate specimen it appeared 

 to be in 19, in another in 20, and in the third in 23 ; in the immature specimen the state 

 of preservation rendered it impossible to determine this point. Typhlosole absent. 

 Lateral hearts: last pair in segment 12 as described for the type of " Ac. pnrpnreiis" but 

 not specified for the types of Ac. bicinctus. 



