JOHNSON: POLYCHAETA OF PUGET SOUND REGION. 421 
Length , 22.5 mm.; greatest transverse diameter, 1 mm. 
No species of Ammochares has hitherto been reported as having 
chelate or bifid uncini. This character in fact has been considered 
so diagnostic of the allied genus Myriochele that M’Intosh did not 
hesitate to describe a species in the “ Challenger ” collection as My¬ 
riochele pacifica from a fragmentary specimen lacking both anterior 
and posterior extremities — basing his diagnosis entirely on the 
structure of the uncini. 
The two specimens upon which the foregoing description is based 
were collected by Miss Robertson at Port Orchard, July 2, 1898. 
Each was enclosed in a tube composed of sand-grains and minute 
particles of shell. The color of the formalin preserved specimens is 
nearly black. 
Arenicolidae. 
38. Arenicola claparedei Levinsen. PL 14, figs. 143, 144. 
In the excellent memoir of Gamble and Ashworth (:00) upon 
the Arenicolidae, the Mediterranean species, originally described 
by Clapar&de (’70, p. 300) as Arenicola marina , but afterwards 
erected as a separate species by Levinsen (’83, p. 137, footnote) 
under the name of A. claparedei , is attributed to the Pacific coast. 
After a careful examination of the Puget Sound Arenicolae at my 
disposal, and comparison with specimens of A. claparedei from 
Naples. I am convinced that Messrs. Gamble and Ashworth are cor¬ 
rect in their determination. The only notable points of difference 
between the Puget Sound specimens and those from Naples are the 
vastly greater size — at least eight times as great — of the former, 
and the smaller number of oesophageal coeca or “pouches ” in the 
latter. Of the four specimens of A. claparedei from Naples which 
I have examined, three have four pairs of pouches, and one only 
three pairs ; whereas, out of eight specimens from Puget Sound in 
four there are six pairs, in two fifteen pairs, in one sixteen pairs; and in 
one there are sixteen coeca on the right and eighteen on the left! 
In the Arenicolidae there are as a rule only two oesophageal 
coeca or “pouches,” but in A. claparedei they are not only numer¬ 
ous (as many as 32 in one instance, Fig. 144) but highly variable as 
to number and arrangement, and probably even differ as to function, 
if it is permissible to draw such an inference from the great size and 
thin-walled character of the most anterior pair (Figs. 143, 144). 
