282 DISCOVERY REPORTS 



of the types can confirm the identification of these specimens with Ch. bicinctiis, but until 

 this has been done it is not desirable to separate the former as representing a distinct 

 species. 



Chilota patagonicus (Kinb.) (Fig. 2/). 



For complete synonymy and bibliography up to 1900, see: 



Chilota patagonica, Michaelsen, 1900, Das Tierreich, x, Oligochaeta, p. 155. 



St. 222, St Martin's Cove, Hermite Island, Cape Horn, 23. iv. 27, under logs and stones; one 

 immature specimen. 



Nephridial pores very slightly below setal line c. Gizzard entirely in segment 5, not 

 in 5 and 6 as stated for the type. Salivary glands stop at septum 4/5. Intestine widens 

 in segment 16. Dorsal blood vessel single as in the smaller specimens described by 

 Michaelsen^ not double as in the typical specimens. Nephridia with well-developed 

 terminal vesicles. Ovisacs apparently absent. 



Prostates as coiled tubular glands confined to the segment in which they open to the 

 exterior, the duct moderately short and thin, somewhat coiled. The posterior pair of 

 prostates smaller than the anterior, as described by Michaelsen^. 



Penial setal sac muscles originate from the body-wall at the first intersegment behind 

 their prostatic pore. Penial setae: those of the a and b bundles alike, essentially as 

 described by Michaelsen. The dimensions are somewhat less than in the types (length 

 1 7-1 -8 mm., diameter in mid-region of stem 19-23 /tt, just below blade ii-15/x), but 

 since the specimen is immature this is not significant. At the extreme distal end below 

 the blade the ornamentation is in the form of single teeth confined to the inner side of 

 the curvature (Fig. 2 /) ; below this the ornamentation is in the form of rows or part 

 rings of teeth and occurs on both sides of the stem. 



Spermathecae : the anterior pair are smaller than the posterior. In other characters, 

 as far as its degree of development permits determination, this specimen is in essential 

 agreement with those specified for the type. 



Genus Yagansia, Mich. 

 Yagansia gracilis (Bedd.) (Figs. 2 i, 3 c, d). 



Microscolex gracilis, Beddard, 1895, Proc. Zool. Soc. London, 1895, p. 234. 

 Microscolex gracilis, Beddard, i8<)6, Ergeb.Hamb.Magalh.Sammelr.,Naid. Titbif. Terric.,^. 54. 

 Yagansia gracilis, Michaelsen, 1899, ibid., Terricolen (Nachtrag), p. 22. Hamburg. 

 Yagansia gracilis, Michaelsen, 1900, Das Tierreich, x, Oligochaeta, p. 160. 



St. 222, St Martin's Cove, Hermite Island, Cape Horn, 400 ft. alt., 24. iv. 27; one clitellate 

 specimen. 



Length, 75 mm. Colour unpigmented, not dark purple as described by Beddard for 

 the types. This may well be the result of fading, as has been discussed by Michaelsen 

 (1899) for other specimens of this species. 



1 Michaelsen, W., Zool. Jalirb., Suppl. 4, p. 472. 



~ Id.,Jahrb. d.Hamb. Wissensch. Anst., vi, Zweite Halfte [Mitt. Mus. Hamb), p. 61. 



