3i7 



rostrum which is very short. Merus of 3 ld legs 4, i-times as 



long as wide in the middle, merus of 4 th legs unarmed. . Eulimcne de Man 

 e 2 Rostrum not short, reaching beyond the middle of basal anten- 

 nular article, frontal margin at either side oblique, convex. 

 Merus of 3 rd legs 3-times as long as wide in the middle, 



merus of 4 th also with a tooth styliceps Cout. 



(H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 889, PI. LXXVIII, 

 fig. 28). 



c„ First carpal article of 2 nd legs not shorter than 2 nd . 



d y Fingers of smaller chela in the male shorter than the palm. 

 e, First carpal article hardly longer than 2 nd . Merus of 3 rd legs 

 at most 3,5-times as long as wide in the middle. 

 f x Rostrum triangular, small, concave, curved upward, not 

 carinate ; rostral carina arising, just behind the rostrum, 

 at the level of the anterior border of the eye-hoods. Dac- 

 tylus of smaller chela in the male much enlarged, twice 

 as long as broad. Merus of 3 ld legs almost 3,5-times as 

 long as wide in the middle clypeatus Cout. 



(H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 897, PI. LXXXI, 

 LXXXII, fig. 36). 



f„ Rostrum very small, rostral carina not interrupted, running, 

 as in A. Alcyone, from the tip of the rostrum backward. 

 Dactylus of smaller chela in the male not enlarged. Merus 

 of 3 rd legs 3-times as long as wide in the middle. . . tryphopus Nob. l ) 

 (G. NOBILI, Ricerche sui Crostacei della Polinesia, Torino, 1907, p. 355). 



e 2 First carpal article at least one and a half as long as 2 nd . Merus 



of 3 rd legs about 4-times as long as wide in the middle. 



f x Rostrum well developed, reaching to the middle of visible part 



of basal antennular article ; the frontal margin appearing 



at either side of the rostrum as a semicircular lobe, bearino- 



o 



7 or 8 long setae. Carpus of 3 rd legs with three spinules 



on the middle of posterior margin superciliaris Cout. 



(H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 896, PI. LXXXI, fig. 35). 



f 2 Frontal margin presenting a convex prominence at either 

 side of the middle, the two prominences separated by a 

 median sinus, below which the very short rostrum is 

 situated. Small chela of the male 3-times as long as high. 



Merus of 3 rd legs 4-times as long as wide in the middle. Adamastor Cout. 

 (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 19). 



1) The position of this species, which was regarded by the late Dr. Nobili as a variety of A. Alcyone, is doubtful, because 

 it is unknown whether the i st carpal article of 2" d legs is really longer than the 2 !ld or not, as also because only the female is known. 



SIROGA-EXPEDITIE XXXIX a '. 41 



