322 CRUSTACEA DREDGED OFF PORT JACKSON, 



Dimensions of type ((J) — 



From rostrum to posterior end of carapace 11 "5 mm. 



Length of eye peduncles 5'0 ,, 



Chelipede of right side 16*5 ,, 



Length of second leg (first ambulatory) 23*0 ,, 



Thirteen specimens in all were taken, the shells occupied being 

 of various genera and species. They vary considerably in size, 

 that described being the largest; the characters described, how- 

 ever, appear to be uniform throughout. 



The nearest ally of this species appears to be P. tuberxulatus 

 Whitelegge,* from which it differs in the armature of the legs 

 and in various other well-marked minor particulars. P. tuher- 

 cidatus was taken by the " Thetis " in large numbers nearer the 

 coast in depths of 20-30 fathoms, and the present species would 

 appear to replace it in the deeper water further out where our 

 haul was taken. 



In the figure submitted the limbs of the right side are shown 

 as denuded of hairs. The hairs are also much more numerous on 

 the left side than appears from the drawing — the line work 

 renderin^r this course desirable for clearness. 



o 



Tribe SCYLLARIDEA. 



Family SCYLLAEIDiE. 



I B A c u s Leach. 



Pl.xi., tig.L 



Ibacus alticrenatus Spence Bate, var. septemdentatus, var.nov, 



1888, C. Spence Bate; Zool. H.M.S. " Challenger," Vol. xxiv. 

 p.63, PJ.ix. fig.2 



Two specimens to which I refer as above were taken. /. 

 alticrenatus is recorded by the " Challenger " as having been 

 dredged off New Zealand in 150 fathoms. 



Mem. Aust. Museum, No.iv. pi. 2, p. 167, 1900. 



