466 OLIGOCHAETA 



(14) Microscolex diversicolor (new species). 



Definition. Length, 53 mm.; diameter, 3-5 mm.; number of segments, 60. Setae distant. 

 Prostomium complete. Dorsal pores present. Clitellum, XIII-XFI. Gizzard in VI. 

 Testes in X. Sperm-sacs in IX, XL Spermidwcal gland opens separately from sperm- 

 duct, hut near. Penial setae unornamented. Spermathecae in IX, with one large 

 1. Hob. — Corral, Valdivia. 



This species varies a good deal in size. I found a few specimens which, though 

 sexually mature, were only 30 mm. in length, and consisted of 100 segments. 



(15) Microscolex longiseta (new species). 



Definition. Length, 40 mm.; diam.eter, 3 mm.; number of segments, 95. Setae strictly 

 paired. Prostomium incomplete. Dorsal pores present. Clitellum, XIII-XVI, incom- 

 plete. Gizzard in FL Sperm-sacs in XI. Spermathecae in IX, with long spirally 

 coiled diverticulum. Penial setae 6 mm. long. Hah. — JJschuia, Puerto Pantalon, Puerto 

 Toro {Navarin); in S. America. 



This species comes very near to M. papillosus. It has the same inordinately 

 long penial setae and the same curious spiral diverticulum to the spermatheca. It 

 is, however, so much smaller and so devoid of pigment that, as I have examined 

 a large number of individuals, I feel obliged to separate the species. There are some- 

 times, however, traces of a faint purple colour dorsally. 



(16) Microscolex elegans (Eisen). 



Deltania elegans, Eisen, Zoe, iv, 1893, P- ^5^- 

 Definition. Length, 100 mm. Prostomium incomplete. Clitellum, XIII-X7II. Setae in 

 eight rows, ventral converging on genital segments. No dorsal pores. Nephridia commence 

 in II. No gizzard. Spermathecae single or a pair, without diverticula. Testes in 

 X, XI. Sperm-ducts open into spermiducal gland within body-wall. Penial setae not 

 ornamented. Hab. — San Francisco and neighbourhood. 



This and the two following species were assigned by Eisen to a new genus, 

 Deltania, which was stated to differ from Microscolex 'principally by the deltoid 

 arrangement of the setae in the vicinity of the male pore.' I am not inclined to 

 allow a separate genus for it. It will be seen that, apart from this very slight 

 difference, the specips which, are enrolled by Eisen in that genus show no really 



