Studies iü Lag-iina Ampliipoda. 639 



spinules on inner marj^in. Telson, sliort, entire, longer tlian wide. 

 rectangiilar, tlie apex veiy slightly incurved. witli a sniall spine on 

 «ach distal corner. 



Mandible, palp 3-jointed, the second longest, and tliird curved; 

 -cutting- plates not dentate; molar obsolescent; brusli on spine-row 

 near usual position of molar. Maxiila 1, inner plate very small, 

 tipped with two setae; outer plate with eight notclied teeth; palp 

 large, two-jointed, the second Joint long-, but unarmed, with the 

 apical edge crenulate. Maxilla 2, outer plate the longer, both but 

 very slightly fringed on inner margin. Maxillipeds, palp not elon- 

 gate, 4-jointed, the fourth small with minute nail; outer plates large, 

 minutely crenulate; inner plates small, slender, apex irregulär, sparse- 

 ly armed. 



This species differs from all others in the same genus in having' 

 the inner plate of the maxilliped narrow, yet not elongate, and in 

 liaving the flagella of the antennae longer. 



Color, white. The females carrying bright orange eggs. 



L. 4—6 mm. 



Very numerous in kelp holdfast from deep water. Laguna 

 Beach, Calif. 



Ainx>elisca articulata n, sp. 



Body very plump, smooth. Head not rostrate. Four corneal 

 lenses, the lower pair occupying the lower corners of the head. 

 Side-plates deep, the fourth very large, excavate behind, the fifth 

 bilobed, very much shorter than the fourth. All the side plates 

 setose on the lower edge. Pleon segment 3 quadrate at lower, liind 

 corner, postero-lateral angles not bisinuate. Pleon segment 4 minutely 

 produced. Antenna 1, peduncle shorter than the 24 — 30-jointed 

 flagellum, ultimate Joint short, penultimate and antepenultimate 

 subequal in length; without an accessory flagellum. Antenna 2 

 longer, the flagellum longer than the peduncle, ultimate and pen- 

 ultimate long, nearly equal, with the penultimate possibly slightly 

 longer; flagellum slender, 23 — 34-jointed. Upper lip rounded, slightly 

 concave at apex. Mandible with palp long, second Joint longer than 

 the third; cutting plates dentate; spines in spine-row numerous; 

 molar small. Maxilla 1, inner plate small, triangulär, and armed 

 with about six setae; outer plate with ten spines; palp two-jointed, 

 the second Joint long, broad, and spinöse. Maxilla 2, inner plate 

 fringed apically and on inner margin; outer plate a little longer 



