ON ANNELIDS FROM THE N.E. PACIFIC. Werth 
15. On the Annelids of the Family Nereidz collected by 
Mr. F. A. Potts in the N.E. Peific, in 1911.—With 
a Note on the Morphology of Micronereis as a Repre- 
sentative of the Ancestral Type of the Nereide. By 
L. N. G. Ramsay, M.A., B.Se., Carnegie Research 
Scholar, Christ’s College, Cambridge * 
[Received December 12, 1913; Read March 17, 1914. | 
(Text-figures 1-7.) 
INDEX. Page 
Morphology: - 
SERS Olt INGINGHS COTAILYPIIS VIVRE, coss.ocabodo occ cos coobaceeueae sbebonsenenavos | BIS) 
Micronereis, external morphology ..............00055 ceceeeeeeeee eee. 245 
TOWONOINOIN OF ING RGED CRBICUUIS. oscac000 000500000 soa doo bus ont bos enoatansouesces | CAO 
Geographical : 
Micronereis variegata Clap., from Pacific Ocean .................. 243 
Systematic : 
Nereis shishidot Iauka,=N. cyclurus Harr. .......0..00c00 0c cece 289 
PV. ezoensis Iauka,= N. vewillosa Grube ...............0c0.00 esses. 240 
IN, dyamusi Vauka= I. virens Sars\......-..cc0cc0 eer cee see sen een san se, 2AQ 
N. dumerilii, kobiensis, agassizi discussed ............000.00.000..... 242 
Micronereis, relationship to Nereida ................0..6.0c0ee0cc0e000 247 
The Annelid fauna of the Pacific coast of North America is 
already fairly well known, and in the present paper only one 
addition is made to it. This, however, is of great interest, as it 
is a representative of the little known genus MJicronereis, and is 
apparently identical with J/. variegata of European waters, the 
solitary species of the genus. 
The remaining five species contained in the collection are 
already well known in this region; several of these are repre- 
sented on the opposite shores of the Pacific by very nearly allied 
species, some criticism of which will be found under their various 
heads. 
The collection also includes two examples of the remarkable 
and extremely interesting Vereis cyclurus Harr., from which some 
new facts as to the setz are brought to light. 
NEREIS cycLuRUS Harr. 
Nereis cyclurus Harrington (4), p. 214, 1897, pls. xvi., xvii., 
XViil. 
N. -shishidoi Iizuka (5), p. 177, pl. xix. figs. 10-18. 
Two examples, Nanoose Bay, June 13th, 1911. Dredged in 
6 fathoms, in soft mud. Commensal with hermit-crabs. 
In Mr. Potts’ notes these are described as of a ‘pale fiesh- 
* Communicated by Prof, J. SranLEY GARDINER, F.R.S., F.Z.S., 
