DESCRIPTIONS OF GENERA AND SPECIES. 267 



vague, irregular depressions of the surface. Along 

 the outer edge of the lateral band, on each side of the 

 abdomen, are ten singular projections, often having 

 markings of darker colour at their bases ; the first of 

 these is at the angle of the anterior, the tenth at that 

 of the hind margin. The first, third, and tenth are 

 single and papilliform ; the second, fifth, and sixth 

 single but less projecting, and directed backward in 

 a somewhat hooked manner; the fourth and ninth 

 have an approach to a bifid form; the seventh and 

 eighth are decidedly trifid. From each projection, 

 except the second, fifth, and sixth, springs a large 

 pointed spine ; those that spring from the first, 

 third, fourth, and ninth projections are decidedly, but 

 not strongly, curved ; the others are nearly straight, and 

 all are directed almost radially. Bursa copulatrix long, 

 and directed slightly upward. On the notogaster, not 

 very far from the median line, are two rows each 

 composed of four fine but strong spines ; the first is 

 directed forward, and the others backward ; the third 

 of these is the longest, and the fourth the shortest. 

 There is also a very long spine between the third and 

 fourth, but nearer to the lateral edge of the abdomen. 

 The legs are very thin in proportion to the size of the 

 creature, rather short, the fourth pair passing the 

 hind margin by about half the length of the tarsus. 

 The two front pairs spring from large, rounded, 

 chitinous projections at the edge of the lower part 

 of the cephalothorax ; these projections have rough, 

 chitinous knobs at their posterior angles. The third 

 and fourth pairs are set well under the body. The 

 legs diminish gradually in thickness from the proximal 

 to the distal ends. Coxse short and rounded; tarsi 

 nearly as long as the three immediately previous joints, 

 which are of about uniform length. Tactile hairs long- 

 on the first three pairs of legs, short on the fourth. 

 The other hairs on the legs are more spine-like in 

 character ; they are a pair on the third joint of each 

 leg, those on the two anterior pairs curved strongly 



