REPORT ON THE AMPHIPODA. 1459 



Lycteopsis pauli, n. sp. 



Head much deeper than long, deeper than the perseon ; posterolateral angles of the 

 first three pleon-segments squared, or with scarcely perceptible outdrawn points ; the 

 fourth pleon-segment shorter than the following composite segment. 



Upper Antenna; lying directed downwards within the frontal groove of the head ; 

 first joint longer than the second ; the third longer than the preceding two together, 

 tapering, with filaments on the inner margin ; the following joint short and almost 

 linear. 



Lower Antenna? placed just behind and above the mouth organs ; the joint containing 

 the gland-cone partially free, the next or third joint of the peduncle longer than the 

 fourth, but slightly shorter than the fifth ; the flagellum at right angles to the peduncle, 

 the first joint shorter and much narrower than the last of the peduncle, the second or 

 terminal joint not half the length of the first. 



First Gnathopods. — First joint with the front margin almost straight and the hind 

 margin nearly parallel to it, the joint being very slightly dilated above ; the larger part 

 of it occupied by the gland-cells ; the second joint longer than broad, bent ; the third 

 scarcely so long as the second, the fourth rather longer than the second, with convex 

 front margin ; the fifth longer than the fourth, narrowed distally ; the finger curved, 

 strong, much more than half the length of the fifth joint, the limb seemingly smooth 

 throughout. 



Second Gnathopods. — The first joint narrower than in the first pair, with parallel 

 margins, the front convex, the hinder concave ; the second joint considerably longer than 

 broad, the third longer than the second, the fourth not longer than the third ; the fifth 

 longer than the fourth ; the finger rather longer than the hand, almost straight, with a 

 narrow, slightly curved, acute nail. 



First Perseopods much longer and stouter than the gnathopods ; the first joint 

 straight, a very little widened below ; the second joint with the hinder margin longer 

 than the breadth of the joint ; the third joint longer and broader than the fourth, with 

 convex front margin ; the fifth joint longer than the fourth, scarcely so long as the third, 

 tapering, a little curved ; the finger not half the length of the fifth joint, bulbous at the 

 base, then suddenly narrowed and bent, the terminal part straight, tapering to a sharp 

 point, the distal division being longer than the proximal ; the limb like the gnathopods 

 almost entirely smooth. 



Second Perseopods scarcely differing from the first, except that the joints are rather 

 longer. 



TJiird Perseopods. — Side-plates bilobed, broader than deep. Branchial vesicles small 

 scarcely half the length of the first joint, irregularly oval, narrower at the neck than 

 distally. The first joint expanded but not widely, neither margin being strongly convex, 



