321 



c„ Orbital hoods rounded or obtuse. 



"2 



d^ Larger chela of a stout shape, only 2,2-times as long as high. 

 Carpocerite as long as antennular peduncle, shorter than the 



scaphocerite. First carpal article as long as 2^^ mitis Dana 



(J. D. Dana, U.S. Explor. Exp. Crustacea, p. 549, PI. 35, fig. i). 



d^ Larger chela 3- or 4-times as long as high. 



e^ Telson at most 3-tirnes as long as its posterior margin is wide. 

 Rostrum not prolonged backward as a dorsal carina. 

 f^ Terminal spine of scaphocerite extending far beyond the 

 scale, terminal spine reaching almost to or even slightly 

 beyond the tip of carpocerite. Rostrum about 3-times as 

 long as wide in the middle, reaching almost to the ex- 

 tremity of I*' antennular article. 

 g-^ Smaller chela with a spine near the articulation of the 

 dactylus. First carpal article 1,75 — 1,85-times as long 



as 2°^ paracrinitus Miers 



(E. J. Miers, in: Annals Mag. Nat. Hist. 18S1, p. 365, PI. XVI, fig. 6). 



g„ Smaller chela with no spine near the articulation of the 

 dactylus. First carpal article as long as 2"<^ .... 



paracrinitics Miers var. bcngalensis Cout. 

 (H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 901, Pi. LXXXII, 

 fig- il)- 



f^ Terminal spine of scaphocerite hardly reaching beyond the 



scale, much shorter than the carpocerite. Rostrum short 



and broad, hardly projecting beyond the orbital hoods. 



Larger chela 3,59 — 3,7-times as long as high .... aJpheopsides Cout. 



(H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 901, PI. LXXXIII, 

 fig. 40). 



c„ Telson 4- or more than 4-times as long as its posterior margin 

 is wide. 

 _/j Merus of 3'''^ legs 5-times as long as wide. Rostrum slender, 

 separated by rather deep notches from the orbital hoods. 



Terminal spine of scaphocerite longer than carpocerite . paralpheopsidesQoMl. 

 (H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 902, PI. LXXXIII, 

 fig 41)- 



y^ Merus of 3"^ legs at least 7-times as long as wide. 



g^ Rostrum, as in A. paralpheopsides Cout., separated by 

 deep notches from the orbital hoods. Larger chela of 

 the male 3-times as long as high. Merus of 3'"'^ legs 

 8-times as long as broad, propodus 1,2-times as long 



as the carpus tenuicarpus de Man 



189 



