276 MR. A. p. MICHAEL OK SOME UKDESCEIBED 



the body. Tlie legs themselves diminisli gradually in thickness 

 from tlie proximal to the distal ends, and each is terminated by 

 a very small single claw, furnished with a sucker or caruncle. 

 The coxae are short and rounded, the tarsi nearly as long as the 

 three previous joints, which are not far from equal to one another 

 in length. The tibise of the first three pairs of legs bear long, 

 flexible, tactile hairs, which are present, but very small, in the fourth 

 pair ; where possibly they are useless in consequence of these legs 

 being usually almost entirely beneath the abdomen. The other 

 hairs on the legs are stiff'er and more spine-like in character. 

 They are as follows, viz. : — a pair on the third joint of each leg, 

 those on the two front pairs of legs being opposite, and strongly 

 curved downward and inward, and slightly serrated ; a very 

 strong, somewhat similarly curved spine springs from the under- 

 side of each tibia near its distal end ; there are two or three 

 short spines on the underside of each tarsus, and one, rather 

 larger, on the upper side of that of the second pair. 



Abdomen large, gradually increasing in width from the anterior 

 until near the hind margin ; the increase is, however, more rapid 

 in the first third o£ the abdomen. The anterior and posterior 

 margins are almost straight. The dorsal surface of the abdomen 

 (notogaster) is considerably raised above the cephalothorax, and 

 is almost flat in general level, but its lateral edges form bands 

 which are depressed at their inner and slightly raised at their 

 outer sides, and its anterior and posterior edges are somewhat 

 depressed. Erom the inner edges of the bands the abdomen is 

 slightly arched upward, but it forms a very low flat arch rising but 

 little above the outer edge of the bands ; the extent of the arching 

 varies in different specimens and at different ages, and there are 

 often vague irregular depressions in 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 and 

 the tenth at that of the hind margin. The first, third, and tenth 

 are single and papillous ; the second, fifth, and sixth single, but 

 less projecting, and directed backward in a somewhat hooked 

 form ; the fourth and ninth have an approach to a bifid form, 

 and the seventh and eighth are decidedly trifid. From each 

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

 and powerful pointed spine more or less radial in position ; those 

 that spring from the first, third, fourth, and ninth projections 



