230 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



the ends and swollen at the point of attachment to the labrum. The 

 mandibles have five or six teeth and the inferior angle, which is 

 bordered by several long spines, may be either single or divided into 

 two points. The surface is hairy, and small spines occur on both 

 edges of the teeth as well as on the surface. The maxillae have two 

 or three large unequal spines, usually followed by three steps with 

 the lower one wider and frequently showing a small notch in the 

 middle. In some there are four steps below the large spines. The 

 outer maxillae have long hairs on the inner surface near the edge. 



The first cirrus is set a little apart from the posterior cirri. The 

 rami are unequal, 12 segments in the anterior and 11 in the posterior 

 one, with the middle segments of each very slightly protuberant. 



The posterior cirri (fig. 3, d) have six or seven pairs of spines with 

 smaller intermediate spines on the anterior border and three to five 

 thick spines and a few fine spines on the posterior distal angle. On the 

 distal border there are multifid spinules and a few longer single 

 spines, particularly near the anterior border. There are about 25 

 segments in each ramus. 



No caudal appendages occur, but in some individuals the membrane 

 on each side of the anus is somewhat swollen. The penis varies in 

 length from half the length to a little longer than the sixth cirrus 

 and is very hairy. 



Size. — The largest specimen seen was from Harriet Harbor and had 

 a capitulum 20 mm. in length and 14 mm. in wadth and a peduncle 

 16 mm. in length and 5 mm. in width. 



Remarks. — L. fecthmta ■pac'ijica can be distinguished from the 

 typical form and from the variety described by Darwin (1851) and 

 the variety squamosa Fischer (1884) and the subspecies hermgiana 

 Pilsbry (1911) by the single occludent margin of the tergum, the 

 absence of umbonal teeth on the scuta, and the absence of caudal ap- 

 pendages. It can be distinguished from all except subspecies henn- 

 giana by the smoothness of the plates. 



Localities. — Biorka Island, Alaska, July 21, 1936, on L. fasciculan^. 

 Queen Charlotte Sound, British Columbia, July 6, 1934, on L. fasci- 

 cuJarls. Lousonne Harbor, Queen Charlotte Island, British Colum- 

 bia, February 11, 1935, with L. anatifera. Harriet Harbor, Moresby 

 Island, British Columbia, August 29, 1934, on kelp with L. anatifera. 

 Naden Harbor, Graham Island, British Columbia, August 28, 1937, 

 on kelp. Swiftsure Bank (lat. 48°31' N., long. 124°53' W.), July 

 10, 1935, on Fucus; August 5, 1934, on L. fascicularu. Friday Har- 

 bor, Wash., July 13, 1937, on floating limb ; July 14, 1937, on floating 

 board, with L. anatifera; July 26, 1937, on floating board. Willapa 

 Harbor, 1922, on kelp. Manzanita Beach, Oreg., August 20, 1938, on 

 driftwood, washed on shore. Short Sandy Beach, Oreg., August 20, 

 1938, on Fueus., washed on shore. 



