3S 



Behind the large supra-orbital teeth which are slightly directed outward, this specimen 

 bears, like those from the Gulf of Manar, still two teeth that rapidly decrease in size : in the 

 fio-ure of the "Challenger" type there are on either side three teeth, instead of two, behind 

 the supra-orbital spines. The infra-orbital spine is a little smaller than the large supra-orbital 

 spine, below and anterior to it there is a conical tubercle and one observes a row of 4 or 5 

 small, sharp teeth between the infra-orbital spine and the cervical groove ; between these teeth 

 and the supra-orbital spines 3 other small teeth occur in front of the cervical groove and these 

 spinules are continued to the posterior margin of the carapace as a longitudinal row of iS or 

 20 small, sharp spinules on the well-defined, angular, lateral margins of the carapace. The 

 gastric region carries in the middle two anteriorly-convergent, longitudinal rows of small, sharp 

 spinules or teeth, 10 or 11 on either side, of which the 3 or 4 anterior ones are smaller than the 

 others; in the younger "Challenger" type only the 3 posterior pairs were developed. The 

 median carina, between the cervical groove and the posterior margin of the carapace, carries 

 a row of 10 acute, subequal teeth, that are little larger than those of the gastric region; the 

 foremost, immediately behind the cervical groove, and the fourth are double, there being here 

 two teeth instead of one. In the "Challenger" type still only 5 teeth were developed and the 

 y^ was much larger than the rest. While in that very young specimen the carapace was still 

 smooth between the armature, in front of the cervical groove, the young female from the Bali 

 Sea carries here several small, acute teeth of unequal size. Behind the cervical groove the 

 carapace is covered with numerous small, acute tubercles of unequal size, which on the sidewalls 

 are smaller and arranged in close series radiating from the upper, anterior angle backward 

 and downward. 



Upper surface of carapace and abdomen covered with a short tomentum. 



The abdomen is plentifully spinulose above. The 2"*^ — 5''' terga are transversely grooved, 

 the groove is shallow and situated much nearer to the posterior than to the anterior margin. 

 The terga are carinated in the middle line, the carina of the 6"^ is double and these carinae 

 are armed with acute, somewhat compressed teeth or spinules of unequal size. The carina of 

 the i^' somite bears an acute tooth, directed straight upward and behind it, on the posterior 

 margin, a much smaller tooth which is directed backward. In front of the transverse groove the 

 2nd tergum carries 2 teeth and behind it also 2, of which the anterior stands straight upward, 

 like the two preceding, while the posterior or 4''^ is much smaller, like on the i^' tergum, and 

 directed obliquely backward. The 3"^ and the 4"^ terga are also armed, in the middle line, 

 each with 4 teeth, which, however, are all directed backward and this is also the case with 

 the teeth of the following somites; there are, on the 3"* and on the 4'^ somite, 2 teeth before 

 and 2 behind the transverse o-roove and on either of them the 2°<* tooth is somewhat larger 

 than the 3 others, nearly like in the "Challenger" type. The 5''' somite bears only 3 teeth, 

 the i^' or anterior is smaller than the 2 other ones, that have the same size as the largest 

 tooth on the 4''> tergum. Each of the two carinae on the 6''i somite bears 4 or 5 teeth that 

 are smaller than the 2 posterior teeth .of the 5'''; the posterior margin of the 6''' somite is 

 armed with 3, somewhat larger spines of equal size, one in the middle and one on the lateral 

 angles, the latter turned slightly outward, and a few much smaller spinules are situated between 



