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and deep, 4th pair by far the largest, transversely truncated at the tip, and 

 deeply emarginated posteriorly in their upper part; 5th pair obliquely oval, 

 bilobed, the posterior lobe the deeper. Metasorae of moderate size. Eyes 

 distinct. Antennae comparatively small, with the peduncles rather elongated, 

 and the flagella only composed of a restricted number of articulations ; the 

 superior ones without any accessory appendage, and larger in male than in 

 female. Buccal mass not very projecting, and concealed by the 2nd pair of 

 coxal plates. Epistome rounded in front. Anterior lip lamellar, distinctly 

 incised at the tip; posterior lip without any inner lobes. Mandibles rather 

 elongated, cutting edge not very expanded, and finely denticulated, having on 

 the left mandible a distinct secondary lamella, molar expansion very small 

 and unarmed, palp slender and nearly naked, not attaining the length of the 

 mandible, and having the terminal joint elongated and curved. First pair 

 of maxillae with the masticatory lobe rather projecting, and obliquely trun- 

 cated at the tip, basal lobe very small, truncated at the tip, and having 

 only a single, minute, apical bristle, palp distinctly biarticulate, terminal 

 joint rounded at the tip, and armed with 2 small spines outside. Second pair 

 of maxillae well-developed, with both lobes elongated, the outer narrower 

 than the inner, only and setous at the tip. Maxillipeds rather large, basal 

 lobes narrow, masticatory lobes of moderate size, reaching beyond the 1st 

 joint of the palp, the latter elongated, setous. Gnathopodamore or less un- 

 equal, the posterior ones being the larger, both pairs distinctly subcbeliform, 

 with the propodos laminarly expanded, and provided with a distinctly defined 

 palm, carpus produced at the end inferiorly, forming, on the posterior pair, a 

 narrow setous lobe stretching along the hind margin of the propodos, meral 

 joint of the posterior pair produced, inferiorly, to a small dentiform projection. 

 Pereiopoda very slender and elongated, subequal in length, basal joint of 

 the 3 posterior pairs large and laminar. Second pair of uropoda rather small, 

 last pair more or less elongated, with the basal part laminarly compressed 

 and longer than the rami, which are simple. Telson conically tapering, entire. 

 Remarks. In the restriction here adopted, this genus is chiefly cha- 

 racterised by the structure of the oral parts, and partly also by that of the 

 gnathopoda. Of the 4 species of Ampliilocims described by Boeck, only 2 

 ought to be referred to this genus, the other 2 forming types of separate, 

 nearly-allied genera. Besides the 2 species described below, the A. oculatiis 

 of Hansen and A. marionis of Stebbing would seem, in fact, to belong to the 

 present genus. 



