416 



THETIS SCIENTIFIC RESULTS. 



Second leg'. 

 Fig. 118&. 



joint bears a small spine at its superior extremity ; inferiorly the 

 sixth joint is excavated for the reception of the seventh when 

 closed. 



Second joints of the second to the 



fourth pairs of legs gradually inci'easing 



in length as the end of the peraeon is 



approached ; each has a small denticle 



near the base on the superior margin ; 



third joints subequal, that of the fourth 



leg with an acute denticle on the 



inferior distal angle ; fourth joints 



decreasing in length from the second 



pair of legs to the fourth ; each is 



armed with a superior distal spine ; 



the fourth joints also have a spine on 



inferior border ; fifth joints subequal, 



that of the second leg with three 



denticles on the superior border ; the 



middle one of the three is often very 



large, and the proximal is small or 



sometimes absent ; the third leg has 



two similar denticles, and the fourth 



bears one at the distal extremity ; sixth and seventh joints of 



the second to the fourth pairs of legs gradually decreasing in 

 length ; the sixth bears four and the seventh three 

 equidistant denticles on their superior borders. 

 Second joints of the fifth and sixth pairs of legs 

 equal, with four denticles, two proximal inferiorly 

 and two distal on the superior border ; second 

 joint of the seventh pair of legs shorter than that 

 of the sixth, with the marginal spines minute or 

 absent. The third and fourth joints are subequal, 

 each has a superior distal denticle, and the lower 

 border of the fourth bears three spinules. Fifth 

 joints short, equal, apically dilated and furnished 

 with three spines on the lower border, the distal 

 one being much the larger. Sixth joint more than 

 two-thirds longer than wide, equal to or exceeding 

 the seventh in length ; the superior border bears 

 two small denticles and the inferior four equidistant 

 spines. 

 The chief feature of this species is the armature of the limbs, 



which mainl}^ take the form of saw-like teeth, and are very 



unlike the usual spinose processes found in many other species of 



the genus. 



Two examples of this form were obtained oiT Wata Mooli, in 



54-59 fathoms. 



Fiftli leg. 

 Fig. llSc. 



