CRUSTACEA. 285 



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

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

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

 sive hand, which is rounded at its proximal cud, 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 surface, passes obliquely down- 

 ward to the lower and proximal margin, aud 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 

 iipper margin ; this line is sometimes nearly obsolete ; the mobile 

 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 tho first, the three last joints short, the fifth a 

 little longer than the fourth. 



In some specimens the lobe or tooth immediately behind the 

 notch on the upper and lower 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 Tort Molle 

 beach (No. 95), 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 Rockhampton (Godeffroy Museum 

 as A. breuirostris, M.-E.). Also from the lied Sea (Dr. 0. 

 Heller); Gulf of Suez (R. Mac Andrew) ; Egypt (J. Burton); 

 Zanzibar (Dr. Kirk) ; Seychelles (Dr. E. P. Wright) ; Karachi 

 (Karachi Museum) ; Ceylon (E. W. H. Holdsworih) ; Indian Ocean, 

 Philippine Islands, Bohol (Cuming); Japan, Katsura (Capt. U. C. 

 St. John, R.N., the specimens I formerly designated A. bisincisus, 

 De Haan) ; New Hebrides (J. Macgillivray) ; Fiji Islands, Nairai 

 (H.M.S. i Herald'); Samoa Islands, Upolu (Rev. S. J. Whit- 

 mee); Tahiti (Mus. Godeffroy, as A. pacifieus, Dana); Sandwich 

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

 (R. J. Lechmere Guppy) 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 series of specimens iu the British-Museum collection, extensive though 

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



