GAMMARIDEAN AMPHIPODA 213 



The following species are distinguished from M. cistella by one or two 

 characters listed: 



Metopa wiesi Gurjanova (see 1951): article 4 of pereopod 5 strongly 

 expanded and with long posterior lobe. 



Metopa pusilla Sars (1895): eyes much smaller, article 3 of uropod 

 3 as long as article 1 . 



Metopa affinis Boeck (see Sars, 1895): coxa 4 much smaller, telson 

 lacking spines, palm of male gnathopod 2 nearly transverse. 



Metopa sinuata Sars (1895): article 4 of pereopod 5 much broader 

 and with longer posterior lobe, antennae shorter. 



Metopa tenuimana Sars (1895) is very close but coxa 4 is smaller, 

 posterior lobe of article 4 of pereopod 5 is longer. 



Metopa bruzelii (Goes) (see Sars, 1895), same as for M. tenuimana. 



Metopa propinqua Sars (1895), same as for M. tenuimana. 



Metopa angustimana Gurjanova (see 1951): article 4 of pereopod 

 5 broader and longer. 



Metopa derjugini Gurjanova (see 1951) is very similar to the new 

 species but has pereopodal dactyls about two thirds as long as the 

 sixth articles and deeply separated inner maxillipedal lobes. 



Metopa spinicoxa Shoemaker (1955a) may be more closely related 

 to M. cistella than is M. derjugini. Metopa spinicoxa has a broad 

 coxa 4 anteroposterior^, bears a first gnathopod similar to that 

 of M. cistella, a male gnathopod 2 which could be a stage in the 

 development of M. cistella, equal antennae, the second antenna 

 being stout (especially noted by Shoemaker), and large eyes. Metopa 

 spinicoxa differs from M. cistella by the longer projection of the lower 

 lip which equals that of the epistome, by the broader and more 

 strongly produced fourth articles of pereopods 4 and 5 and by the 

 full expansion of article 2 of pereopod 4. 



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

 platform, rare (11 per sq. m.) ; present on algae below water, collected 

 by diver. 



Stenothoe ?estacola J. L. Barnard 



Figure 61 

 ^Stenothoe estacola J. L. Barnard, 1962c, p. 149, fig. 17. 



No adults as fully developed as the male shown by Barnard (1962c) 

 have been collected in the present survey. The original material 

 was obtained at Pt. Fermin and Corona del Mar in mass washes of 

 sponges, phragmatopomids, and corallines. Presumably the specimens 

 assigned herein belong with that species, subadult males having 

 gnathopod 2 in a youthful stage, showing minutely a single middle 

 palmar hump, two of which occur in the adult originally described. 

 All of the subadult specimens have antenna 1 very slightly longer 



