CRUSTACEA. 285 



■without or has only a rudimentary spine at base ; it narrows some- 

 what to its apex, ■which has a small spinule at its outer angle. The 

 larger chelipede (which may be either the right or left) has a mas- 

 sive hand, ■which is rounded at its proximal end, notched above and 

 toothed below, just behind the bases of the fingers ; on the outer 

 and inner surface of the palm, just below the incision in the upper 

 margin, is an irregular shallow depression, that on the inner surface 

 being somewhat of a triangulate and that on the outer surface of a 

 quadrangulate shape ; an impressed line, which forms the posterior 

 margin of the depression of the inner siirface, passes obliquely down- 

 ward to the lower and proximal margin, and upward over the 

 rounded superior margin, whence it is prolonged in a nearly straight 

 line along the upper and outer surface to the rounded base of the 

 upper margin ; this line is sometimes nearly obsolete ; the mobUe 

 finger is rounded and subcarinated above, and is armed on its inner 

 margin near the base with a very prominent rounded tooth' or lobe, 

 which fits into a deep pit in the lower (immobile) finger ; the smaller 

 chela is slender (in the typical form), without notches, teeth, or 

 sulci; the second joint of the carpus of the second leg is usually a 

 little shorter than the first, the three last joints short, the fifth a 

 little longer than the fourth. 



In some specimens the lobe or tooth immediately behind tlie 

 notch on the upper and lo-wer margins of the large chela is rounded 

 or subacute, in others it is acute. 



Eight specimens (males and females) are in the first collection 

 from Port Curtis, 0-11 fms. (No. 92), one (male) from Port MoUe 

 beach (No. 9-5), and two females from Port Denison, 4 fms. (No. Ill); 

 a small specimen (No. 123) is without special indication of locality. 

 In the second collection are two small specimens from Thursday 

 Island, 4-5 fms., a female from Dundas Straits, 17 fms. (No. 161), 

 and an adult female from the beach at Port Darwin (No. 176). 



There are, besides, specimens in the British-Museum collec- 

 tion from other localities as follows : — North Australia {Dr. J. R. 

 Elsey), Port Essington and Eockhampton {Oodeffroy Museum 

 as A. brevirostris, M.-E.). Also from the Eed Sea {Dr. G. 

 Heller); Gulf of Suez {B. MacAndrew); Egypt (/. Burton); 

 Zanzibar {Dr. KirTc) ; Seychelles {Dr. E. P. Wright) ; Karachi 

 {Karachi Museum) ; Ceylon {E. W. H. Holdsworth) ; Indian Ocean, 

 Philippine Islands, 'Bdho\ {Cuming) ; Japan, Katsura {Capt. H. 0. 

 St. John, B.N., the specimens I formerly designated A. hisiiwisus, 

 De Haan) ; New Hebrides {J. Macgillivray) ; Eiji Islands, Nairai 

 {H.M.8. 'Herald'); Samoa Islands, Upolu {Bev. S. J. Whit- 

 mee) ; Tahiti {Mus. Godeffroy, as A. pacificus, Dana) ; Sandwich 

 Islands {W. H. Pease). Specimens from the island of Trinidad 

 {B. J. Lechmere Ouppy) and the west coast of Central America 

 {Capt. Dow) seem to be scarcely specifically distinguishable *. 

 The males may be distinguished from the females by the form of 



* The aeries of specimens in the British-Museum collection, extensire though 

 it be, does not fully exhibit the ascertained range of this species. According to 



