142 U.S. NATIONAL MUSEUM BULLETIN 2 58 



sq. m.); Phyllospadix-coroWine grid, scarce (90 per sq. m.); coralline 

 algae, scarce; sponge and tunicates, most abundant species. 



Distribution. — Tropical Indo-Pacific with northern limit in 

 eastern Pacific at Cayucos, California. 



Chevalia aviculae Walker 



Chevalia aviculae Walker: J. L. Barnard, 1962a, pp. 17-20, fig. 5 (with literature) ; 

 1964a, p. 236. 



Material. — cayucos: Phyllospadix-pelvetiid grid, scarce (62 per 

 sq. m.); Macrocystis holdfast, moderately abundant; sand under 

 boulder, rare; Phyllospadix roots, scarce, goleta: Macrocystis hold- 

 fast, 3 m., abundant; submerged log, 8 m., rare. 



Distribution. — Tropicopolitan, occurring haphazardly in southern 

 California as far north as Cayucos, California. 



Eurystheus mamolus (J. L. Barnard,) new combination 



Figures 29, 30 

 Megamphopus mamolus J. L. Barnard, 1962a, pp. 23-26, fig. 9. 



This species is transferred to Eurystheus now that specimens with 

 first antennae have been collected. The accessory flagellum has 3 

 articles. This shift in classification again points to the provisional 

 but unsatisfactory arrangement of various photid (=isaeid) genera 

 as reviewed and revised by Barnard (1962a). Better detail of some 

 of the appendages, especially pereopod 3, is figured herein. Females 

 are difficult to identify and are far more numerous than males which 

 are easy to recognize by their distinctive, posteriorly-lobed second 

 coxae. Article 2 of the male first pereopod becomes thickened and 

 lobate distally in contradistinction to the second male pereopod and 

 both pereopods 1 and 2 of females. 



Material. — goleta: submerged log, 8 m., scarce; Macrocystis 

 holdfast, 3 m., abundant. 



Distribution. — Monterey Bay to Goleta, California, 3-25 m. 



Eurystheus spinosus Shoemaker 



Figure 31 

 Eurystheus spinosus Shoemaker, 1942b, pp. 30-32, fig. 11. 



All specimens lack antennae and pereopod 5 and most of the spec- 

 imens lack all of pereopods 3-5. They are difficult to separate from 

 females and juveniles of Megamphopus martesia J. L. Barnard (1964a). 

 Male pereopod 3, having an expanded and strongly spinose article 4, 

 is very distinctive. On females the article is less expanded, poorly 

 spinose, and more like that of M. martesia. The eyes of adult M. 

 martesia are very large but in the questionable youthful specimens 

 from Baja California, identified by Barnard (1964a), the eyes approx- 



