The nearly circular flattened part of the carapace, the absence of a prominent external 

 orbital angle, the short triangular abdomen of the cf, and especially the very long and slender 

 walking legs are sufficiënt characteristic features; the walking legs are, according to Ciiilton, 

 nearly three times the breadth of the carapace, and Calman l ) adds that in specimens of the 

 British Museum the legs are even more slender. The dactyli are, according to Chilton's figures, 

 distinctly shorter than the preceding joints, though in the text the reverse is stated. 



The species inhabit the waters of New Zealand (Greymouth, Sumner, Auckland Islands, 

 Akaroa Heads). 



Halicarcinus White. 

 For synonymy see STEBBING, Proc. Zool. Soc. London, 1900, p, 521. 



Stebbing made a detailed bibliographical study of this genus, to which several most 

 obscure species have been referred, most of which most probably enter into the synonymy of 

 H . planatus (Fabricius). Both Stebbing and Miers ~) agree in accepting two species, that may 

 be distinguished thus : 



Teeth of the tridentate rostrum placed wider apart : dactyli of walking" 



legs narrowing gradually to apex, spines at inner border disposed 



in two indistinct, longitudinal rows H. planatus (Fabricius) 



Teeth of the tridentate rostrum placed close together, touching each 



other at the base; dactyli of walking legs more slender, keeping the 



same breadth throughout their length till quite near apex, spines at 



inner border disposed in a single file H. ovatus Stimpson 



To which of these species the H. pitbescens Dana 3 ) is to be referred remains uncertain, 

 and I have found no reference to it in more recent literature. It inhabits rather deep water 

 (50 fathoms) at the east coast of Patagonia. Perhaps it is a new species, for the carapace is 

 represented as nearly as broad as long, whereas it is distinctly broader in the two other species. 



Some other species, viz. " Hymenosoma" leachi Guérin 4 ), " Hymenosoma" tridaitatum 

 Jacquinot et Lucas 5 ), " Liriopea' leachi Nicolet 6 ) and " Liriopea" lucasii Nicolet 7 ) are most 

 incompletely known, and as any attempt to- identify them is useless, they are better to be 

 cancelled altogether. Halicarcinus huttoni Filhol 8 ) seems to be identical with H. planatus, as 

 far as can be judged. 



1) In a note to Chilton's article. 1. c. p. 149. 



2) Rep. "Challenger" Brachyura, 1886, p. 2S0 — 2S1. 



3) Proc. Ac. Nat. Sc. Philadelphia, 1S51, p. 253. U.S. Expl. Exp., Crust., 1S52, pi. 24, f. S. 



4) Voy. "Coquille", Crust., 1828, p. 22. Iconogr. Règn. an., Crust. pi. 10, f. I. 



5) Voy. "Astrolabe" Póle Sud, t. 3, 1853, p. 60, pi. 5, f. 27. Halicarcinus tridentalus Filhol, Miss. ïle Campbell, t. 3, 1885, 

 p. 396. Filhol's description refers to Hymenicus rather than to Halicarcinus. 



6) In Gay, Hist. d. Chile, t. 3, Zool., 1849, p. 160, pi. I, f. I. 



7) L. c. p. 160. 



8) L.c. p. 398, pi. 47, f. 1. 



SIBOGA-EXPEDITIE XXXIX c. 



