1925] Shoemaker, Amphipoda from Gulf of California 31 



Side-plate 6 shallower than 5, hind lobe much deeper than front lobe. Side-plate 7 

 shallow, widest at upper margin. All side plates fringed with plumose setae. Gnatho- 

 pods 1 and 2 very much alike, 2 a little the stouter. Gnathopod 1, second joint slender, 

 slightly curved, and with an oval depression surrounded by stout bristles on the inner 

 distal end, fourth joint short with lower margin evenly convex and furnished with 

 many bristles, fifth joint as wide as sixth and about two-thirds as long, lower margin 

 produced into a prominent lobe, the edge of which is provided with many bristles, 

 sixth joint stout, more or less oval, palm very convex, much longer than hind margin, 

 defined by a prominent bristle and furnished throughout with many fine bristles, finger 

 long, slender, smooth, and of about the curvature of the palm. Gnathopod 2, second 

 joint slender, provided on front and hind margins with plumose setae, and on the in- 

 side distal end with an oval depression surrounded by stout bristles, fourth joint short 

 with lower margin produced into a blunt point, fifth joint wider than sixth and about 

 two-thirds as long, lower margin produced into a very prominent lobe which is edged 

 with many stout bristles, sixth joint and finger as in gnathopod 1 but a little stouter. 

 Perseopods 1 and 2 long and slender, first joint provided on front and hind margins 

 and inner surface with many long, plumose seta?, fourth, fifth and sixth joints are 

 provided on their front and back margins with many long stout spines, dactyls flat, 

 and nearly as long as sixth joints. Peraeopod 3, stout, second joint widest above, 

 hind margin evenly convex above and nearly straight below, both front and hind 

 margins provided with long plumose setae, fourth joint densely clothed on inner 

 surface and front and hind margins with long plumose setae, fifth joint about one-half 

 as long as fourth and two-thirds as long as sixth, fifth and sixth joints provided on their 

 front and hind margins with many stout bristles, dactyl broad and flat, and equal in 

 length to sixth joint. Peraeopod 4 with sixth joint and dactyl missing, in general 

 outline much like peraeopod 3, but longer, and less plumose on fourth joint. Peraeo- 

 pod 5 long and slender, second joint widest through the upper third, hind margin 

 slightly convex and provided with plumose setae, fourth joint very slightly longer than 

 fifth, sixth joint very slightly longer than fourth, dactyl nearly two-thirds as long 

 as sixth joint. Abdominal segments 1-3 with lower margins evenly rounded and 

 provided with a fringe of plumose setae, segment 2 the deepest. Fourth, fifth, and 

 sixth segments missing. 



Length. — From tip of rostrum to end of third abdominal segment 24 mm. 



Bateidae 

 Batea rectangulata, new species 



Type Locality. — San Francisquito Bay, Gulf of California, electric light; 1 

 specimen. 



Female. — This single female specimen is the first of this genus to be described 

 from the west coast of America, all previous records having been from Brazil, West 

 Indies, and the east coast of the United States. There are several very definite char- 

 acters which differentiate it from the east coast species. Antennae missing excepting 

 the first few joints of the peduncles. Eyes too badly distorted for any definite out- 

 line to be discerned. Head with rostrum strongly curved downward and acutely 

 pointed. Mandibles with five spine-teeth on left and four on right, third joint of 

 palp about two-thirds as long as second, and provided on distal half of inner margin 

 with many long, curved minutely-plumosed setae, and near the proximal end of outer 



