12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



The most important clues are the lengths of the antennal flagella and 

 the produced points of the second and third pleonal epimera, unique 

 to this species. 



Possibly A. stimpsoni Boeck, from San Francisco, represents a 

 young male of this species, although it could also represent A. japonica 

 Stebbing or A. djakonovi Gurjanova, two species which may occur in 

 northern California. Bate (1862) shows this species having uropod 

 3 exceeding the end of uropod 2 by a considerable degree. In these 

 southern specimens of smaller size, this is not the case. 



Distribution: "Arctic Seas" (Bate 1862), a cold temperate species 

 barely penetrating to tropical limits in the warm temperate, from 

 Kodiak Alaska, south to the Shizueka Prefecture in Japan and to 

 Magdalena Bay in Baja California, with records from Oregon, Puget 

 Sound, and southern California. 



Ampithoe lindbergi Gurjanova 



Figures 6-7 

 Amphithoe [sic] lindbergi Gurjanova, 1938, pp. 351-354, fig. 49; 1951, pp. 892-895, 

 fig. 620. 



Ampithoe femorata Kr0yer. — J. L. Barnard, 1952, pp. 24-28, pis. 6-7 (not Kr0yer, 

 1845). 



Diagnosis: Second and third pleonal epimera rounded behind; 

 article 6 of male gnathopod 1 slightly longer than article 5, posterior 

 edge of article 5 with a broadly truncated posterior lobe, article 6 

 slender, rectangular, palm short, transverse, finger greatly overlapping 

 palm; gnathopod 2 of male with subrectangidar article 6, palm 

 oblique, slightly concave, but clearly defined, minutely crenulate at 

 defining area, palm shorter than hind margin of article 6, finger short, 

 fitting palm or slightly overlapping it, article 2 with poorly developed 

 distal bump; article 2 of pereopods 1-2 about 2.0 times as long as 

 broad; ventral edge of article 1 on antenna 1 with at least one spine; 

 antenna 1 longer than antenna 2, flagellum nearly four times as long 

 as flagellum of antenna 2; flagellum of antenna 2 very short, stout, 

 strongly setose, progressively decreasing in male in number of articles 

 from about 6 to 3; apical lobules of lower lip short, subequal in length; 

 coxa 1 not produced forward; peduncular process of uropod 1 long. 



Female: Gnathopod 1 similar to that of male, article 5 slightly 

 shorter; gnathopod 2 like gnathopod 1 but article 5 even shorter and 

 with moderately well-developed, but rather stout hind lobe; antenna 

 2 generally with 1-3 more flagellar articles than in male. 



Material: Velero station 1664 (15). Barnard stations 27 (3), 42- 

 T-5 (1 juv.?), 42-T-6 (2), 42-T-7 (l), 42-C-7 (2), 43-B-3 (2). 

 Point Fermin, Calif., Jan. 14, 1949, coll. Dr. J. L. Mohr (2). 



