GAMMARIDEAN AMPHIPODA 221 



than the posterior margin of article 6; the first gnathopod has a 

 less distinct palm with a larger spine at the theoretical defining 

 limit; the upper lip is less deeply incised. The other known species 

 of Stenula (see list in Barnard, 1962c) are much further removed 

 from the new entity than those discussed above. 



Material. — hazard canyon: algal turf on platform, rare; 

 Egregia holdfasts, rare. 



Synopiidae 



Tiron biocellata J. L. Barnard 



Tiron biocellata J. L. Barnard, 1962b, p. 75, fig. 2; 1964a, p. 247. 



Material. — la jolla: short-tufted algal ridge, rare. 

 Distribution. — Monterey Bay, California, to Bahia de San 

 Cristobal, Baja California, 0-180 m. 



Talitridae 



Orchestia sp. 



Material. — la jolla: sand-inundated algae at high tide line, 

 scarce (88 per sq. m.). 



