40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



Ampithoes, it is presumed they represent a marginal population that 

 will find assignment to a northern species. The aberrancy of the 

 shortened fourth article of antenna 2 of one of the males indicates the 

 marginality of the deme. 



In summary, these several populations of closely related ampithoes 

 are now recorded, but relationships and taxonomic assignments are 

 still unclear: Ampithoe mea Gurjanova, A. eoa Gurjanova, A. annenko- 

 vae Gurjanova, A. eoa of Barnard (1954), the present material of 

 Ampithoe species, A. tea Barnard, new species, and A. plea Barnard, 

 new species. 



Genus Cymadusa 

 Acanthogrubia Stout, 1912, p. 143. 



Cymadusa uncinata (Stout), new combination 

 Figures 26-28 



Acanthogrubia uncinata Stout, 1912, p. 146, figs. 81-83. 



Paragrubia uncinata. — Shoemaker, 1941, p. 188. — Hewatt, 1946, p. 199. 



Diagnosis: Male gnathopod 2 with palm nearly transverse and 

 bearing a deep slit that splits off a large posterior tooth; accessory 

 flagellum 3-5 articulate. 



Material: Velero station, 878-38 (3). Barnard station 41 (100+) . 



Records: Goleta and Anacapa Island, Calif., 2 and 15 fms.; at 

 Goleta collected from holdfasts of Macrocystis pyrifera. 



Relationship: This is the only species of the genus to have the 

 large tooth of gnathopod 2, and so it is remarkably distinct from its 

 relatives. Apparently this is the largest amphipod species on the 

 coast of southern California, reaching a length of 35 mm. 



Shoemaker transferred this species to Paragrubia, but it belongs 

 with Cymadusa because gnathopod 1 is smaller than gnathopod 2, 

 the reverse of the condition of Paragrubia. 



Distribution: Southern California. 



