Studies iu Lagima Amphipoda. 655 



füuitli. Pleon Segments not coalesced. Antennae nearly equal in 

 length. the upper the stouter. Antenna 1 with tlie first Joint of the 

 peduncle tliick. subequal in length to the third, the second Joint 

 longer; flagellnm 9 — 11-jointed; no accessoiy flagellum. Antenna 2, 

 pednncle with the autepenultimate Joint short, ultiniate and pennlti- 

 mate subequal; flagellum 8— 9-jointed. Upper lip slightly emargi- 

 nate. Lower lip, onter lobes large. not notched ; inner lobes present. 

 Mandible with molar large; cutting plates dentate; several spines 

 in spine-row; palp large, second Joint longer than the third, third 

 very setose. Maxiila 1, inner plate small, apparently unarmed; 

 onter plate with nine spines; palp large, apically spinöse, longer 

 than outer plate. Maxiila 2 with botli plates fringed apically, the 

 inner fringed on the inner margin. Maxillipeds, inner plates small^ 

 rectangular, three spines on apex and a few plumose spinules on 

 apex and part way down the inner margin; outer plate edged with 

 spines, serrate at apex; fourth Joint of palp small. 



Gnathopod 1 of the male, second Joint produced ; fifth as wide 

 and long as sixth, irregularly produced behind; sixth with concave, 

 oblique, setose palm; finger serrate. Gnathopod 1 of the feraale 

 similar to the male, but with the palm not rauch concave. Gnatho- 

 pod 2 of the male, second Joint produced, especially on the distal 

 front end; fifth Joint much shorter than the sixth, produced very 

 narrowly between the fourth and sixth; sixth large and broad, palm 

 cruiously excavate with a small, forward-turning projection near the 

 hinge, and then a deep. rounded excavation bounded behind by a 

 long, Sharp process, making the end of the palm. Gnathopod 2 of 

 the female somewhat longer than 1, not so large as the male; fifth 

 Joint neither as wide nor as long as the sixth; sixth Joint broad, 

 not so irregulär as in the male, with two rather shallow excav- 

 ations; finger serrate, somewhat sinuose. Pereiopod 1 armed with 

 plumose setae; second Joint very moderately expanded; fourth Joint 

 large; fifth small. Pereiopod 2 similar, but somewhat smaller. 

 Pereiopod 8 small, second Joint greatly expanded ; fingersmall, with 

 denticle behind. Pereiopods 4 and 5 longer, more slender, the second 

 Joint not greatly expanded; the dactyl about the same size as in 

 the third, both with a denticle behind. Uropod 1, peduncle longer 

 than the subequal rami. Uropod 2, peduncle somewhat longer than 

 the rami ; the inner ramus the broader and longer, lanceolate. Uro- 

 pod 3, peduncle longer than rami; the inner ramus very small with 

 one spine at apex; the outer ramus somewhat setose, two-jointed. 



