GAMMARIDEAN AMPHIPODA 163 



missing on all specimens; pleonal epimera each slightly convex 

 posteriorly, posteroventrally produced into small blunt tooth be- 

 coming larger and blunter successively from segments 1 to 3; outer 

 rami of uropods 1-2 shorter than inner, ventrodistal end of peduncle 

 of uropod 1 bearing acute process; uropod 3 elongated, rami about 

 25% as long as peduncle, outer ramus bearing 3 distolateral cusps, 

 apical cusp not an immersed or articulated spine, proximal cusp 

 with tiny accessory bristle, margin proximal to proximal cusp mi- 

 nutely scaly, inner ramus simple, straight, bearing one basally im- 

 mersed articulated spine, lateral margin scaly; telson short, subtriang- 

 ular, apically blunt, armed with 2 dorsal spines and several marginal 

 setules. 



Holotype— AHF No. 624, male, 1.9 mm. 



Type locality. — Station 45-W-5, La Jolla, California, November 

 11-13, 1962, scraping of calcareous sponge under ledge in surge 

 channel. 



Relationship. — The foregoing table shows the relationship of 

 this species to others of Microjassa and those of Parajassa. It differs 

 from all species assigned to Microjassa by the long fifth coxa. It 

 differs from the type species, M. cumbrensis , by the well developed 

 inner plate of maxilla 1, the presence of only 3 cusps on the outer 

 ramus of uropod 3, and in the poor development of the proximal 

 and distal processes of the male second gnathopodal palm. The new 

 species differs from M. macrocoxa Shoemaker (1942b) in the distally 

 subquadrate coxae in the male, the longer fifth article of male 

 gnathopod 1 and of the female gnathopods, the poorly developed 

 posterior lobe of that article, by the relatively longer peduncle and 

 shorter rami of uropod 3, and, very radically, by male gnathopod 2 

 and its shape, which in M. macrocoxa has a cheliform palmar process 

 and an accessory process distal to that on the large palmar excavation. 

 Microjassa claustris differs from M. litotes J. L. Barnard in the long 

 fifth coxa, the fewer and larger cusps of the outer ramus of uropod 

 3, the large dorsal telsonic spines, the longer fifth articles of male 

 gnathopod 1 and of the female gnathopods and the broad expansion 

 of mandibular palp article 3. 



Material. — corona del mar: ?algae below water, rare (question- 

 able identification), la jolla: sponge from overhang below water, 

 rare; calcareous sponge under ledge, second most abundant species. 



Microjassa litotes J. L. Barnard 



Microjassa litotes J. L. Barnard, 1954c, pp. 127-130, pis. 35, 36. 

 Ischyrocerus litotes: J. L. Barnard, 1962a, pp. 53-56, figs. 23, 24; J. L. Barnard, 

 1964a, pp. 226-227. 



Material. — carmel: PhyUosjjadix-pelvetnd grid, moderately 

 abundant (70 per sq. m.); algal holdfasts, moderately abundant; 



