JOHNSON: POLYCHAETA OF PUGET SOUND REGION. 389 
chosen, all risk of harm is avoided, as it fits in a cleft between two 
layers of soft material. . . . At least four out of every six contained 
a parasite, and, what is rather strange, the worms were nearly all 
of one size.” 
Later collectors have found it not uncommon in that region. The 
Columbia University collection contains four specimens, probably 
from Neah Bay, as the species is mentioned by Harrington and Grif¬ 
fin (’97) as having been found there “on Fissurella .” Miss 
Robertson’s collections afford only a single fragmentary specimen 
from Alki Point. I have several from Anacortes, collected by Miss 
Louise M. Carpenter, of Berkeley, Cal. These last occurred under 
the mantle of specimens of Glypliis aspera , preserved with the Anne¬ 
lids. This Gastropod is undoubtedly the usual host, but I have 
found it also in the gill-groove of Cryptochiton stelleri , and once on 
the Leather Star (l)ermasterias imbricata), crawling on the aboral 
surface. The southern limit, so far as known, is Point San Pedro, 
about twelve miles south of San Francisco. Two specimens were 
found at that locality by Prof. W. J. Raymond of the University 
of California, who kindly placed them at my disposal. Although 
about eighteen specimens of Glypliis aspera were examined, only 
these two specimens of P. lorcli were obtained. Like Polynoe 
Jragilis, this species becomes more abundant northward. Every 
specimen of Glypliis aspera brought from Anacortes by Miss 
Carpenter had one or two examples of P. lordi under its mantle; 
and Lord states the proportion to be “ at least four out of every 
six. 77 
Two of the Columbia University specimens have almost no pig¬ 
ment. Even the brown zone on the ninth somite, so constant a feature 
of this species, cannot be made out in one specimen. This example 
is remarkable also for its size, having 83 somites and 41 pairs of 
elytra. 
P. lordi , like Lepidametria commensalis (Webster, ’79), Polynoe 
gigas Johnson, and Harmothoe tuta (Grube) often has asymmet¬ 
rical somites in the posterior portion of the body. In one of the 
specimens from Anacortes the thirty-first somite is asymmetrical 
(cirriferous on the right side, elytrophorous on the left). In a 
specimen from Dillon’s Beach, Sonoma Co., Cal., there are as many 
as nine asymmetrical somites, and yet there are the same number 
of elytra (27) on both sides. The elytra on the right side are borne 
on somites 2, 4, 5, 7 . . . . 23, 26, 28, 29, 31, 33, 35, 37, 38 , 40 , 42 , 
