Studies in Laj>niia Arnphipoda. 643 



flagellum 18-jointed; accessory flagellum 9— 11-jointed, Antenna 2 

 set far back below ; first three joints ot' peduiicle distinct, ultimate 

 and penultimate subequal; flagellum 15 — 20-jointed. Upper lip 

 rounded, without emargination. Lower lip developed, mandibular 

 processes small. Mandible witli molar well developed, several spines 

 in spine-row; cutting plates small and dentale; palp large, 3-jointed, 

 tlie second Joint slightly longer than the third, the third with long, 

 slender setae. Maxiila 1, inner plate small with numerous small 

 setae on inner margin; outer plate with ten spines; palp two-jointed, 

 produced beyond the onter plate, expanded apically and arraed with 

 spines. Maxiila 2, inner plate fringed on inner margin and apex; 

 outer plate the larger, apically fringed. Maxillipeds, inner plates 

 quadrate, with plumose spinules; outer plates rather large, with 

 blunt spines and setae; palp long, 4-jointed, the fourth Joint long, 

 tapering, curved. 



Gnathopod 1 of the female, the whole gnathopod somewhat 

 setose; the second Joint long, scarcely produced; fifth Joint longer 

 and nearly as wide as sixth ; sixth Joint oval, palm oblique, slightly 

 convex, defined by small spines; finger, long, serrate. Gnathopod 1 

 of the male similar to the female, except that the second Joint is 

 more expanded and thickly armed with long setae. Gnathopod 2 

 of the female larger than 1; the fourth Joint quadrate; the fifth 

 cup shaped, shorter but nearly as wide as sixth; the sixth longer 

 and much stronger than in 1, palm oblique, four serrations on the 

 half nearer the finger hinge, tooth and spine at apex; finger long, 

 serrate. Gnathopod 2 of the male larger and stronger than in the 

 female; second Joint densely setose; fifth Joint not as long but sub- 

 equal in with to the sixth; palm oblique, deeply incurved on either 

 side of the middle, serrate process betvveen the two excavations; 

 finger strong, longer than the palm. Pereiopods 1 and 2 slender, 

 not expanded. Pereiopod 3 longer, second Joint with spines in front; 

 and produced into a serrate plate extending over the third Joint 

 behind; the fourth Joint rather large and wide; fifth short; sixth 

 long; finger blade shaped. Pereiopods 4 and 5 successively longer 

 than 3. Pleopods well developed, with two rami. Uropod 1 with 

 the peduncle slightly longer than the rami; the inner ramus slightly 

 the longer; both rami and peduncle armed with spines. Uropod 2 

 with the peduncle shorter than the rami; inner ramus the longer. 

 Uropod 3, peduncle subequal to the subequal rami ; extending furtlier 



