— 
268 COLE 
bristles along the dorsal curve; c/. strong, fully half as long as #.2, but 
slightly curved; aux. cl. well developed, half as long as cZ, Legs of 
female nearly smooth, a few small bristles, especially on the dorsal 
side of f, 41, and 42; male considerably more spiny, especially on coxal 
joints. 
Length of male about 3 mm., extent about 13 mm.; female slightly 
smaller. 
As shown in the following table, the localities at which this species was 
taken were two—Orca, in Prince William Sound, and Popof Island, in 
the Shumagin group. Those at Orca were found on Zhwuiaria turgida 
Clark.! 
SPECIMENS EXAMINED. 


Lot. Locality. No. of specimens. Date. Source. 
6 Popof Id., Alaska ie July, 1899 H. A. E. (Prof. Kincaid) 
(113) 
7 Popof Id., Alaska 192 July 8, 1899 | H. A. E. (Prof. W. E. 
Ritter) 
25 | Orca, Alaska Ig’, 19 June, 1899 H. A. E. 
_ 
Remarks.—This species resembles Ammothea levis (Hodge) as de- 
scribed by Sars (’91, p. 124, pl. xu, fig. 2, a-m), especially in lacking 
the very spiny character of many of the species of the genus. It appears, 
however, to be distinct from 4. /evis. Among other differences may be 
noted the following: 4. alaskensis has but one protuberance on the 
lateral processes, in place of two; the eye tubercle is much smaller, 
with the eyes of the same size; the proboscis is considerably larger in 
proportion and of a different shape; the chelifori are not half as long as 
the proboscis, and the basal joint has a prominent dorsal process; the 
second joint of the palpi is not shorter than the fourth; the auxiliary 
claws are much better developed. A. alaskensis is also about twice the 
size of A. Jevis. 
No immature specimens of A. a/askensis were found. 
Rather thickly scattered over the surface of one of the specimens 
from Orca, and especially on the palpi, was observed a peculiar elliptical 
diatom, and it was of interest that the same form was found on one of 
the specimens from Popof Island, some six or seven hundred miles to the 
westward. Two or three other species of diatoms were also clinging to 
the latter. The first-mentioned diatom has also been observed on other 
species of Pycnogonida. 
. am indebted to Professor C. C, Nutting for the identification of this Hydroid. 
