GAMMARIDEAN AMPHIPODA 133 



apices of telson somewhat blunt; coxae 1-4 with large posterior cusps. 



Adult females have not been collected. Juveniles have poorly- 

 developed setal bundles on the antennae. Females may be difficult 

 to separate from Hyale grandicornis but the third uropods should 

 be comparable to those of male A. anceps. 



Holotype. — AHF No. 619, male, 8.0 mm. 



Type locality. — Barnard station 42-T-5, Hazard Canyon Reef, 

 wash of Egregia holdfasts, December 8-9, 1961. 



Relationship. — This species differs from Allorchestes plumicornis 

 (Heller), as figured in Chevreux and Fage (1925), by the relatively 

 equal, short antennae, the shorter and sparser setal bundles of antenna 

 2, the short fifth articles of the pereopods, the shape of the third 

 pleonal epimeron, the circular shape of article 2 on pereopod 5, the 

 shorter article 5 of gnathopod 1 having a distinct posterior lobe 

 (male), and the larger posterior cusps of the anterior coxae. 



Allorchestes plumicornis, as identified by Iwasa (1939) from Japan, 

 appears to be distinct from the Mediterranean A. plumicornis, 

 especially in the shape of article 2 on pereopod 5, the shape of gnatho- 

 pod 1 in the male, especially the more slender dactyl, and the more 

 equally proportionate antennae. Iwasa's specimens may represent 

 Allorchestes penicillatus Stimpson (1855, see Stebbing, 1906, for 

 reference), described also from Japan. The present species differs 

 from Iwasa's depiction by the shape of article 2 on pereopod 5, which 

 in Iwasa's material has a suboval lobe distally projecting rather 

 strongly, by the short fifth articles of the pereopods, the larger cusps 

 on the anterior coxae, the less sharply produced pleonal epimera, 

 the smaller medial spine on the peduncle of uropod 1, the stronger 

 inner castellations of the pereopodal dactyls, which apparently are 

 only faintly suggested on Iwasa's diagrams, and by the larger process 

 on article 4 of male gnathopod 1. 



Material. — carmel: cobble-pelvetiid grid, abundant (50 per sq. 

 m.). cayucos: Phyllospadix-pelvetiid grid, rare, hazard canyon: 

 especially abundant on wave-dashed algal turf platform (30-60 per 

 sq. m.). 



Hyale grandicornis calif ornica, new subspecies 



Figures 27, 28 

 Diagnosis. — Eyes very large, black, nearly meeting dorsally; an- 

 tenna 1 reaching about to end of first, or as much as third, flagellar 

 article of antenna 2, flagellum of antenna 1 slightly longer than pe- 

 duncle; antenna 2 less than half as long as body, flagellum slightly 

 longer than peduncle, article 5 of peduncle about one third again as 

 long as article 4; palp of maxilla 1 exceeding spine bases of outer 

 plate; maxillipedal palp somewhat stouter than shown by Hurley 



