2o6 



DISCOVERY REPORTS 



laterally. The three setae borne by the proximal endite of the maxillule still point to- 

 wards the mouth, but they lie close against the anterior limit of the paragnaths. The 

 distal endites extend forwards on either side of the labrum, the posterior setae recurving 

 towards the mouth (Fig. 4 A). 



The maxilla is, in some respects, reduced. Thus the endopodite consists of a small 

 distal lobe while the exopodite is either absent or represented by a group of three or 

 four lateral setae. There are four endites of which the second, third and fourth form a 



Fig. 3. Nebaliopsis typica. Lateral view of front part of body 

 after cutting away the right half of the carapace. 



ant. I, antennule; ant. 2, antenna; e. eye; end. endopodite; ep. epipodite; ep.t.l. i, epipodite of first trunk 

 limb; ex. exopodite; mdb. mandible; mdb.p. mandibular palp; mx. i, maxillule; mx. 2, maxilla; r. rostrum. 



small group of three setose lobes at the base of the endopodite. Despite this simplifica- 

 tion in structure the maxilla is relatively enormous compared with that of Nebalia, 

 and this is due to the development of the first endite, which is approximately twice the 

 length of the rest of the limb. It consists of a curved spoon-shaped plate armed on the 

 inner edge with a row of closely set setae (Fig. 4 A). In Nebalia I pointed out (1927, 

 p. 365) that the most anterior setae on this endite curve round the hinder face of the 

 paragnaths just as do the setae of the proximal endite of the maxillule, and, since the 

 limb projects at right angles to the body axis, the tips of these setae lie in one transverse 

 plane. In Nebaliopsis the homologous setae occupy a similar position but, owing to the 



ant A 



