c„ Dactyli of three posterior legs with a small, acute, accessory tooth 



on the posterior margin Polyxo de Man 



b„ Both in the male and in the female the dactylus of the small chela 

 SLibspatulate in form, ''Balaeniceps"-shaped. 

 c. Larger chela about 2,2-times as longf as hig-h fing-ers almost as hig^h 

 as the palm. 



d^ Merus of 3'''^ legs 3,7-times longer than wide stremius Dana 



d,-, Merus of 3''^ legs almost 5-times as long as wide. stremtusT)'A.v\d.v2s. angiilatiLs QovX. 

 (H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 914). 



c^ Larger chela 2,4-times as long as high, fingers distinctly less high 



than the palm. Merus of 3"^ legs 5-times as long as wide . . Audouini Cout. 

 (H. CoUTlERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 914). 



c^ Larger chela 2,86 — 3-times as long as high. Merus of 3'<^ legs 5,26 — 



6, 5-times as long as wide. . . ... pareuchirus Cout. var. imitatrix de Man 



b.^ Dactylus of smaller chela neither in the male nor in the female sub- 

 spatulate in form, never "Balaeniceps"-shaped. 

 c^ Rostrum triangular, flattened above, very narrow. Proportion between 

 length and height of the small chela in the male 4,85 .... 



bis-incisiis de Haan var. stylirostris Cout. 

 (H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 911, Fig. 49,49a). 



c„ Rostrum not flattened above. 



d^ Groove or depression on the supero-internal surface of the larger 



chela not triangular. 



e.^ Groove or depression on the supero-internal surface of the larger 



chela U-shaped, the margins perpendicular to the upper margin 



of the palm. Rostrum joining the frontal margin by a regular 



curve Boitvieri A. M.-Edw. var. Hiihtlensis Cout. 



(H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 908, PI. LXXXV, 

 fig. 46). 



c„ Groove or depression on the supero-internal surface of the larger 

 chela almost inconspicuous. Frontal margin presenting a small 



prominence at either side of the rostrum Maindroni Cout. 



(H. COUTIERE, in: Bull. Soc. Entom. France, 1S98, N'^ 5, p. 133, Fig. 2). 



d. Groove or depression on the supero-internal surface of the larger 



chela triangular. 



e^ Merus of both chelipeds with the infero-internal margin unarmed. 



Spine of basicerite as long as stylocerite. Carpocerite much 



longer than antennular peduncle. Lateral margins of the rostrum 



setose pacijicus Dana 



e„ Merus of larger cheliped with a spine at the apex of infero- 



internal margin. 



197 



