120 DK. C. CHILTON ON T]1E 



ing's apparently intended to strengthen the large flat plate thus formed ; the endopodite 

 consists of a single long slender appendage, gradually narrowing to the end ; the 

 epipodite is formed of an oblong lobe with, rounded end. The external male organ is 

 short, rather narrow and rounded at the end. 



The second pleopod of the male has tlie exopodite of fair size, subquadrate with angles 

 rounded off, and of similar structure to that of the first pleopod ; the endopodite is 

 represented by a 2-jointed appendage, the first joint extending directly inwards like a 

 prolongation of the base, the second at right angles to this, as long as the exopodite, 

 gradually tapering to an acute apex. 



The succeeding pleopoda have the exopodite much larger than the endopodite, and 

 ajjparently mainly ojiercular ; the endopodite is subtriangular, with the inner portion 

 thickened, and is branchial in function. 



The uropoda have been already sufficiently described. 



2. ScYPHAX (?) AUCKLANDiiE, G. M. Thomson. (Plate 15. fig. 2.) 



Acttecia aucklandue, G. M. Thomson, Trans. N. Z. Inst. xi. p. .349 (ISTQ). 



Ackecia cnit-kl(indi<i\ Bndde-Lund, Isopoda Tcrre.stria, p. 239 (1885). 



Acttpcia avcklanclice, Filhol, Mission de I'lle Campbell, p. 443 (1S85). 



? Oniscus nova-zealandixe, Filhol, /. c. p. 441, PI. liv. fig. 7 (1885). 



Actacia aucklandue^ Thomson & Chilton, Trans. N. Z. Inst, xviii. p. 158 (188(5). 



Specific description. — Body oblong-oval, length about twice the greatest breadth, sides 

 of mesosome j^arallel. Cephalon with lateral lobes large and broad ; front triangular, 

 depressed, somewhat excavate in the middle (in dorsal vein appearing neaily straight) ; 

 an oblique ridge on each side running backwards and outwards behind the eyes from 

 near the centre in front to the posterior margin of the cephalon ; surface between these 

 ridges roughly tubercular. Side-2)lates of mesosome well develojoed, especially those of 

 the first segment ; posterior margin of first segment slightly sinuous, posterior angles 

 subacute, posterior angles of succeeding segments becoming more and more acute. 



On each segment is a small oblique ridge on the side-plate running backwai'ds and 

 outwards, and betAveen these ridges eacli segment bears numerous irregular tubercles, 

 some rounded, others more acute ; on the three anterior segments they are rather less 

 marked and irregularly arranged ; on the four posterior segments they form a regular 

 row of somcAvhat pointed tubercles projecting a little backward along the posterior 

 margin of the segment, with irregular granulations anterior to this row. 



Metasome not abruptly narrower than mesosome, first two segments short, their sides 

 overlapped by the last segment of mesosome ; side-plates of third to fifth segments large, 

 produced acutely backwards ; surface of each of these segments with a transverse row of 

 small tubercles, and with others irregularly distributed ; terminal segment short, much 

 broader than long, triangular, sides concave, extremity rounded and depressed, fitting 

 closely on to the bases of the uropoda. 



Eyes of moderate size, situated on a slight prominence above the lateral lobes, and 

 external to the oblique ridges. Antennules easily visible. Antennte short, reaching 

 backwards to the posterior border of the second segment of mesosome ; first three joints 

 short, subequal ; fourth longer, somewhat broadened ; fifth a little longer than the 



