128 THE VOYAGE OF H.M.S. CHALLENGER. 



depths varying from 573 to 1030 fathoms ; its occurrence in the Pacific is a matter of 

 extreme interest. 



Munida spinulifera, Miers. 



Munida spimdifera, Miers, Crust, in Zool. H.M.S. " Alert," p. 279, pi. x.xxi. fig. A, 1884. 



Habitat. — Amboina ; depth, 1 5 fathoms. An imperfect male specimen (without 

 chelipedes) measuring 16 mm. in length. 



This species is allied to Munida japonica, Stimpson, as well as to Munida militaris, 

 Henderson. The rostrum is arcuate and more than twice the length of the supraorbital 

 spines. The gasti'ic area of the carapace is armed in front with a transverse row of 

 spinules, about twelve or thirteen in number ; a spinule is also present on each branchial 

 area immediately behind the cervical groove. The external maxillipedes are somewhat 

 pubescent, and the merus is armed with a single spine near the proximal end of its 

 inner margin. The second abdominal segment has several spinules on its anterior 

 margin, and a few of very small size also occur on the third segment. 



The types were dredged by the "Alert" in the Arafura Sea at a depth of from 32 

 to 36 fathoms. 



Munida spinosa, Henderson (PI. HI. fig. 3). 



Munida sjnnosa, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 408, 1885. 



Characters. — The rostrum is about half the length of the carapace and slightly 

 upturned towards the apex ; the supraorbital spines are distinctly elevated, with a 

 slight divergence, and extend a little beyond the middle of the rostrum. The striae on 

 the surface of the carapace are strongly developed, and as a rule without hairs ; the 

 gastric area is distinctly circumscribed, and bears in front from six to ten spines arranged 

 in a semilunar-shaped row, of which the two largest are situated behind the supra- 

 orbitals, a single spinule (occasionally absent) is found on each branchial region 

 immediately behind the cervical groove, and a spine occurs in front of this on the area 

 formed by the .splitting of the cervical groove. The lateral margin of the carapace is 

 armed with about seven well-marked spines, two of which are placed in front of the 

 anterior division of the cervical groove ; the first or postorbital is longer than any of the 

 others. 



The chelipedes are long and of moderate width, with all the joints strongly spinose, 

 the largest spines being, however, situated on the merus ; the spines on the upper surface 

 of the propodus are more curved than usual and arranged in three rows ; the fingers are 



