110 DK. C. CHILTON ON THE 



the third segment of metasome. The sutures dividing the epimera from the central 

 portions are fairly evident in the second, third, and fourth segments, but are indistinct 

 in the fifth, sixth, and seventh ; in some specimens they are indistinctly marked in the 

 fifth segment also, and the distinctness of the sutures is, I think, a character that is 

 subject to considerable variation, though Dollfus has established a nevr genus Geoligia 

 differing from Ligia only in having the epimera not distinct for a species, G. Slmoni, 

 found in the forests of Venezuela at an altitude of 1200 metres *. 



The metasome is considerably narrower than the mesosome, the first and second 

 segments small and withoiit distinct epimeral projections, third, fourth, and fifth 

 segments subequal with well-developed epimera, lateral angles acutely produced 

 backwards, those of the fifth segment reaching very nearly to the postero-lateral angle 

 of the sixth segment ; sixth segment with its posterior margin deeply hollowed on each 

 side for the base of the uropoda, its central part regularly convex. 



Surface of whole body slightly granular and with a few irregulai-ities, showdng under 

 a high power, especially at the sides, very minute set;ie which scarcely project beyond the 

 surface. 



The antennul(e consist of the usual three joints, the first much the broadest, second 

 nearly as long as the first but narrower, the third very small, rounded at the end ; a 

 few minute setfe are present, chiefly on the second joint, but no " sensory setye " were 

 observed. 



The autemxp are repi'esented in PL 11. fig. 1 u.'- : the first three joints are subequal, 

 short, nearly as broad as long, the fourth joint shorten than the fifth but broader ; 

 flagellum about as long as the last three joints of tlie peduncle together ; in the fig. «.-, 

 taken from a specimen 12 mm. in length, the flagellum is composed of fifteen joints, but 

 it may contain a greater or less number, Thomson says "flagellum 16- to 23-jointed." 

 There are numerous short and rather stout set;e oa the last three joints of the peduncle, 

 and finer setfe on each joint of the flagellum. In the South Island specimens these 

 latter are usually shorter than the breadth of the joint from which they spring, but in 

 the Waiwera specimens they are fully as long as the joint is wide, or may even slightly 

 exceed this length. 



The mouth-parts are w^ell developed and of a more generalized type tban in most other 

 Terrestrial Isopoda. The upper lip calls for no special remark ; it is rounded, wdth a very 

 shallow emargination at its extremity, and provided with numerous sliort seta? in the 

 usual manner. The mandibles are strong and of the same general shape as in Ligia 

 oceamca ; in the right mandible the outer cutting-edge is formed of four stout teeth ; the 

 accessory appendage is slender, bends abruptly about the middle, and on its inner side is 

 prolonged into a slender acutely-pointed process ; its terminal part is nearly transparent, 

 and its basal part appears very pale brown and is evidently much less highly chitinized 

 than the corresponding part in the left mandible ; Ijetvveen this accessory appendage and 

 the molar tubercle is a soft membranous lobe, rounded at the end and thickly covered 

 with seta}, tho.se along its inner margin being longest and plumose; molar tubercle strong, 

 curving iuAvards, its truncate extremity covered with closely-set rows of short, stout seta?. 



* " Voyage de M. K Simon au A'enezuola," Ann. Societe entom. dc Franco, vol. Ixii. (IbO^), p. 3-13. 



