352 "ENDEAVOUR" SCIENTIFIC RESULTS. 



angled, but not acute or spined. The antennular flagella 

 are about two-thirds to five-sevenths the length of their 

 peduncle. 



The fifth pair of thoracic legs extend about as far 

 forward as the third pair and exceed the tip of the 

 antenual scale by from one-fifth to nearly one-third the 

 length of their propodal joints. There are spines at the 

 bases of the first and second pair of legs. 



The telson shows on each margin in advance of the 

 readily discernible pair of subterniinal spines, one or two 

 pairs of minute, scarcely perceptible spines. 40 



The thelycum has anteriorly the more or less cordi- 

 form plate seemingly typical of the females of this genus. 

 In this particular species, however, this plate has a 

 median posterior extension or tongue, which overlaps 

 what ordinarily in most of the related species is a 

 centrally depressed portion of the posterior plate, and 

 fuses with the hinder margin of that plate, so as to 

 form a pair of lateral depressions, one under each outer 

 angle of the "cordiform v plate. Anteriorly this "cordi- 

 form" plate is itself medially slightly depressed or 

 excavated; posteriorly its tongue-like extension rises to 

 a bluntly indicated, transverse ridge about in line with 

 the lateral pits or depressions of the posterior plate of 

 the thelycum. Behind this prominence or swelling the 

 "tongue" is posteriorly rounded off; before it the sloping 

 portion of the "tongue" shows a faint median ridge which 

 rapidly fades out on the "cordiform" plate before it 

 reaches its depressed portion. 



MraKitreincntx. Of the "Endeavour" specimens 

 listed above, the largest is 95 mm. long from tip of 

 rostrum to end of telson, and the two smallest 82 rnni. 

 long ; the three others are respectively 86, 89 and 89 mm. 

 long. 



Remarks. The male of this species has not yet been 

 seen. It is possible that it might prove to be the same 

 as de Man's sulaco, as there does not seem to be any 

 exclusive characters. On the other hand, however, until 

 more is known of both species, it seems better to 

 consider them as distinct. 



40 These spines have been carefully searched for by three 

 members of the Australian Museum staff, but could not be dis- 

 tinguished. They are, therefore, not shown in the illustration on 

 plate xlix., prepared at the Australian Museum. P. A. McNEiLL. 



