206 PROFESSOR CHARLES CHJLTON ON THE 



Eyes completely absent. Upper antennae reaching considerably beyond peduncle 

 of lower. First joint of peduncle very stout, produced at inner upper angle into a 

 long acute spine reaching beyond the end of second joint, and with a blunter and shorter 

 spine on under outer side ; second joint produced into subacute spine on the outer side ; 

 third joint with small spines on the outer and inner sides, the outer one tipped with 

 setae, flagellum longer than peduncle, rather stout, especially towards base, and having 

 some of the basal joints slightly produced below and bearing the sensory setse. 



Lower antennae as long as head and first five segments of perseon ; last joint of 

 peduncle somewhat compressed laterally, longer than preceding, which is slightly keeled 

 above and produced at the extremity. 



First gnathopod simple, fairly stout ; carpus much broader and longer than propod ; 

 the lower margin of merus, carpus, and propod spinose. Second gnathopod similar to 

 first in size and form. 



First and second peraeopods longer than gnathopods and somewhat slender. Third 

 peraeopod much longer than second, its basal joint narrow, with ridge running 

 down the middle of outer side ; propod much longer than carpus. Fourth 

 peraeopod similar to third, but considerably longer ; lower posterior angle of basal joint 

 quadrate and not produced. Fifth peraeopod much longer than the fourth ; basal joint 

 broader, produced posteriorly at upper part into a rounded lobe below which the margin 

 is deeply concave ; postero-inferior angle produced into an acute point reaching almost 

 as far as the end of the ischium. 



First uropod with base much longer than the subequal branches and grooved above ; 

 branches narrow-lanceolate, ending acutely, the outer one folded in under the inner. 



Second uropod similar, but with peduncle as long as inner branch ; the outer branch 

 not much more than half the length of inner. Third uropod with peduncle very short, 

 produced above on outer margin into an acute spine which reaches as far as the end of 

 the telson ; the two branches subequal, narrow-lanceolate, flat, the outer one folded 

 under the inner. Telson flat, laminar, scarcely narrowed, emarginate posteriorly. 



On the whole, this species seems to come fairly well under Acanthonotozoma, though 

 it would not be difficult to find points in which it does not quite fit the generic 

 description. Both gnathopoda are simple, but the first is neither slender nor feeble. 

 The mouth parts have not been examined in detail, but do not appear especially drawn 

 out for piercing ; the palp of the mandible is slender, that of the maxilliped is 

 small and slender, and shorter than the very large outer plate, which is much larger 

 than the inner plate. 



Genus LEPTAMPHOPUS G. 0. Sars, 1893. 



Leptamphopus novse-zealandiw (G. M. Thomson). 



Pherusa novx-zealawh'tE G. M. Thomson, 1879, p. 239, pi. x.o, figs. 2, 2a-c. 



Panoplcea debilis G. M. Thomson, 1880, p. 3, pi. i. fig. 3. 



Oradarea I'xir/imnna Walker, 1903A, pp. 40 and 56, pi. x. figs. 77-89. 



(ROY. sue. EDIN. TRANS., vol. XLVIU., 488.) 



