156 



Antennal scale long, foliaceous, not concealing the terminal joint of the 

 antennal peduncle. 



The 1st pair of thoracic legs though the longest and much the stoutest, are 

 still of a comparatively slender cast : they end in long slender chelas, having sub- 

 cylindrical palms and long compressed fingers. The 2nd and 3rd pairs are 

 chelate, the 2nd pair being slenderer and much longer than the 3rd. 



The 1st pair of abdominal appendages are uniramous, slender in the female, 

 modified in the male to a pair of longish subacute lamellae channelled along the 

 inner surface. The 2nd— 5th pairs are weak and biramous, the rami being narrow 

 and of no great length : in the male the endopodite of the 2nd pair has a rigid 

 internal appendix of good length. 



The branchial formula is as follows : — 



Total 6 + 7 ep. 10 4 = 20->-7 ep. 



The podobranch of the 2nd maxillipeds is small but plumose. 



90. Phobems ccecus, A. M. Bdw. 



Phoberus catena, A. Miloe Edwards, Ann. Sci. Nat., Zool., (6) XI. 1881, Art. 4, p. 1, and Recueil de Fig. de 

 Crust, nonv. pi. 86 : A. Agassiz. Bull. Mus. Comp. Zool. XV. 1888, p. 44, fig. 241. 



Phoberiis csecus var. tenuimanus, Spence Bate. 



Phoberus Unaimunus, Spence Bate, Challenger Crust. Macrura, p. 171, pis. xxi, xxii. 

 Phoberus exens var. sublevis ; Wood-Mason, Ann. Mag. Nat. Hist., Feb. 1891, p. 197. 



Appears to differ from P. csecus typicus in having the fingers of the large 

 chelipeds longer. 



Carapace, legs, tail-fan, abdominal pleura and the greater part of all the 

 abdominal terga covered, in the adult, with prickles and sharp granules. [In 

 the young the integument is much less prickly and on the abdominal terga is 

 almost smooth]. 



Rostrum more than half the length of the rest of the carapace, upcurved, 

 broad depressed and dorsally concave at base, but soon becoming acutely sub- 

 styliform : its styliform portion is serrated ventrally, and is either smooth or 



