176 iiR. A . D. MICHAEL oiN" ATf [Mar. 5, 



Colour orange-scarlet, varying in different parts of the body in 

 shades from orange to scarlet. Chitinous plates on the dorsal and 

 ventral surfaces and the legs lemon-yellow ; spines on the legs 

 yellow tipped with scarlet. 



Form oblong, corners rounded ; compressed dorso-ventrally ; 

 dorsal surface Hat, concave in young specimens. 



Texture. — The whole cuticle of the body, where it is not chitinized, 

 is covered by conspicuous rounded papillae, having an average 

 diameter of about "005 to 'OOS mm. The dorsal and ventral surfaces 

 are, however, mostly occupied by numerous porous chitinized plates 

 sunk in the cuticle ; the epimera, sternal plate, legs, palpi, and 

 maxillary lip are all chitinized and pierced by pores averaging 

 about 150 to the millimetre on the epimera and sternum, and 

 about 250 to the millimetre on the legs and palpi; while the 

 actual pores themselves have an average diameter of about '003 in 

 the former, and '001 in the latter situations. 



Uijes crimson, placed at the antero-lateral angles of the body ; 

 the two eyes in each pair quite distinct. I cannot find any trace 

 of a fifth median eye. 



Maxillary lip (fig. 4). — This, as usual, forms a deep trough, 

 slightly narrowed toward the anterior end, which is sharply 

 truncated and slightly bifid. 



Palpi (fig. 5) have the second joint the thickest, the fourth much 

 the longest, the fifth a blunt claw. They are what is known as the 

 Hydrophantes-Yi?^\^\xs, i. e. the dorsal part of the fourth joint pro- 

 jects considerably parallel to the fifth, so that the fourth and fifth 

 form a sort of chela. 



Mandibles (figs. 3, 21) almost straight; the chitinous wall of 

 the dorsal half of the first joint much longer than that of the 

 ventral. There is a membranous anterior projection (mdp.) over- 

 hanging the second joint, which joint is hook-hke, movable, and 

 serrated on its upper (concave) edge. 



Dorsal surface (fig. 1). — This is mostly covered by chitinous 

 plates sunk in the cuticle, and which are usually at the bottom of 

 small depressions ; these depressions are formed partly by the drying 

 up and often entire rubbing off of the portion of the external layer 

 of the cuticle which overlies the plate, and partly by these plates 

 giving points of attachment for the powerful dorso-ventral and other 

 muscles, by which they are drawn downward (into the body) a little. 

 These plates are of two kinds : one consists of large, or compara- 

 tively large, plates thickly and irregularly pierced by areolations 

 of various sizes and shapes, but so large and numerous that the 

 holes cover a larger area than the chitin ; a small poi'tion of one 

 of these plates is shown at fig. 11. The second kind consists of 

 quite small plates, mostly haWng some approach to the round or 

 square form, and mostly with an almost circular opening in the 

 middle and the rest of the plate pierced by fine pores more regu- 

 larly placed than those on the larger plates. Each smaller plate 

 bears a small hollow colourless hair or spine close to the central 

 hole, if there be one, but the hair is always present ; such hairs do 



