16 DE. W. T. CALMAN ON NEW OR EAEE 



female in the very long and narrow ocular lobe, but the carapace is smooth, with only 

 a faint trace of the encircling ridge so conspicuous in the female and without the 

 paired dorsal ridges posteriorly. On the lower part of the side of the carapace is a 

 horizontal ridge, also very faint, meeting the encircling ridge anteriorly. The dorso- 

 lateral keels are well-marked on the last two thoracic somites, but the abdominal 

 somites, which are very stout, have no distinct keels. The terminal segments of the 

 first pair of legs are longer and more slender than in the female. 



Remarks. — In the sculpture of the carapace this species is quite distinct from any 

 other, and it is not easy to see in what direction its immediate allies are to be sought. 

 In the long and narrow ocular lobe it resem.bles C. e-vsculpta Sars and C. persculpta 

 Caiman. In the distinctness of the first leg-bearing somite it approaches especially 

 C. costata and C. picta Caiman. 



Occurrence. — Several localities in the Gulf of Siara. " Koh Kam, 5-10 fathoms." 

 "Between Koh Mesan and Cape Liant, 5-8 fathoms." "TungKaben, 6 fathoms.'' 

 Th. Mortensen Coll., Copenhagen Museum. Co-types in British Museum. 



Cyclaspis THOMSON), sp. n, (Plate V. figs. 12-16.) 



Description of adult Female. — Total length 6 mm. 



The carapace is little more than one-fourth of the total length, slightly compressed, 

 its vertical height little more than half its length. The dorsal edge with a distinct 

 keel, which is flattened or faintly doubled posteriorly, slightly arched as seen from the 

 side, with a slight concavity at the base of the pseudorostrum. Pseudorostrum short ; 

 the ocular lobe reaching to or a little beyond the tip of the lateral lobes. Antennal 

 notch rather widely open ; antennal tooth triangular. The surface of the carapace is 

 everywhere beset with shallow pits, which in full-grown specimens give it a rugose 

 appearance. On each side, a little behind the middle of its length, is a short groove, 

 limited behind by a faintly marked ridge running obliquely downwards and backwards. 

 A slight ridge runs backwards for a short distance from the antennal tooth. 



First leg-bearing somite exposed at the sides only. Second with a distinct dorsal 

 keel. Last three with lateral keels. 



Abdomen a little longer than the cephalothoracic region ; the somites subcylindrical, 

 with distinct median dorsal and lateral keels and the usual lateral articular processes. 



First legs of moderate length, extending beyond the tip of the pseudorostrum by 

 little more than one-fourth of the length of the carapace. The basis is a little 

 shorter than the distal segments together and is not produced into a tooth distally ; 

 it bears two densely plumose hairs at its distal end. The dactylus is about two-thirds 

 as long as the propodus and three-fourths as long as the carpus. 



The peduncle of the uropods is longer than the last somite by nearly one-third. 

 The endopod is a little shorter than the peduncle, acutely pointed at the tip, without 

 an apical spine, with four spinules on its inner edge. Exopod a little longer than 



