81 



fine hairs, the outer margin slightly insinuate ; the outer 

 ramus longer than the inner, showing areolate structure. The 

 second pleopods have the appendix longer than the lamina of 

 the inner ramus. The inner ramus of the third pleopods is 

 opaque and distally truncated ; the outer ramus with a division 

 rather distant from the end, terminating in a small notch on 

 the inner margin. The outer ramus of the fifth pleopods is 

 narrow, with a distal thickening obscurely three-lobed, with 

 a small lobe, perhaps double, on the inner margin just below. 

 The division is indistinct. 



The uropods project obliquely downwards, the external 

 ramus is sublaminate, bifid at the extremity, the outer margin 

 cut with four teeth, the inner with one. The inner ramus 

 also is bifid and much reduced. - 



Integument hard. 



The female is unknown. 



Gulf St. Vincent. One specimen. 



Cilicsea tridens, n. sp. PI. xxiii., figs. 1 to 12. 



The body is very convex, with nearly parallel sides, 

 slightly setose, and nodular to rugged on the abdomen. 



The head is nearly vertical anteriorly, and very nodu- 

 lar ; some of the tubercles inclined to be spiniform. There 

 is a much-thickened anterior border projecting, and there 

 is a median rounded tubercle just above the rostral process 

 and a thickening above each antennule. The rostral process 

 is truncated, and does not project. Looked at from below 

 the epistome recedes towards the rostrum anteriorly, and at 

 the angle where it meets the apex of the labrum it slightly 

 projects. 



The eyes are rounded and prominent. 



The first segment of the thorax is also nodular ; its pos- 

 terior lateral angle is truncated and little produced back- 

 wards. Each of the remaining thoracic segments bears a 

 row of strong spines on its posterior margin, especially the 

 seventh. The epimera have each a nodule, and they are 

 vertical in direction ; those of the third and seventh segments 

 are shorter than the others. A suture line is evident. 



The abdomen is very tuberculate and jagged. The 

 anterior portion projects behind as a trident, the median 

 process of which is slightly bent downwards and slightly over- 

 reaches the end of the abdomen; also, this part of the 

 abdomen projects downwards laterally a good deal. The 

 posterior portion has three conspicuous tubercles on each side 

 of the median process of the anterior portion, and behind 

 these the descent is abrupt and excavate medianly with three 

 prominent tubercles on each side, arranged triangularly two 



