b„ Larger chela without a transverse groove near the articulation of the 

 dactylus. Rostrum as in A. gracilipes, triangular, flattened above, 

 arising from between the bases of the eye-hoods, with the margins 

 overhanging the rostro-orbital furrows. 

 c^ First carpal article of 2"'^ legs hardly half the 2"'^i in length . . pugnax Dana 

 (J. D. Dana, U. S. Explor. Exp. Crustacea, p. 554, PI. 35, fig. 6). 



c^ First carpal article of 2"<^ legs 1,2-times as long as 2^^. Rostrum 

 1,5-times as long as wide at its base, with a trace of a gastric 



spine in the mid-Hne dasycheles Cout. 



(H. CoUTIERE, in: Bull. Soc. Philom. Paris, 1908, p. 21). 



a„ Merus of 3'''i legs with no tooth at distal e.xtremity of posterior margin. 



b^ Larger chela with a transverse or oblique groove on the upper border 



near the articulation of the dactylus. 



c^ Rostral carina more or less obtuse, not arising from a triangular, 



flattened base between the eye-hoods. 



d^ Second carpal article 1,12-times as long as i^'. Merus of 3''^ legs 



a little more than 4-times as long as wide, bearing 3 movable 



spinules on the middle of posterior margin. Larger chela with 



a transverse furrow Lanccloti Cout. 



(H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 900, PI. LXXXIII, fig. 39). 



d„ First carpal article 2 — 2,44-times longer than 1^^. Merus of 3'''^ 

 legs quite unarmed. Upper border of the larger chela with a 

 narrow groove anteriorly, running obliquely inward, though 



not continued on the inner surface of the palm Elilersi de Man 



(J. G. DE Man, in: Proc. Zool. Soc. London 1909, p. 663, PL LXX). 



c„ Rostrum arising from a triangular, flattened base between the eye- 

 hoods, separated from the latter by deep grooves. 

 d^ Frontal margin with an almost vertical prominence just before 



and at the inner side of the obtuse tips of the eye-hoods. . gracilipes Stimps. 

 d„ Frontal margin straight. Larger chela thicker than that of A. 



gracilipes novae-zelandiae Miers 



(E.' J. Miers, Catalogue of the Stalk- and Sessile-eyed Crustacea of New Zealand, 

 London 1876, p. 82, PI. II, fig. 2). 



6„ No transverse or obhque groove on the upper border of the larger chela. 



c^ Orbital hoods terminating in flattened spines ("epines plates") reaching 



to the middle of 2°'^ antennular article. Larger and smaller chela 



quite as in A. paracrinitus Miers var. bengalensis QowX..^ i^' carpal 



article of 2"'^ legs 1,7-times as long as 2°*^. Third legs more 



slender than those of A. paracrinitus Coetivcnsis Cout. 



(H. CoUTIERE, in: Bull. Soc. Philom. Paris, 1908, p. 20). 



1S8 



