whole length, with eight spinules, of which the distal ones are the longest, measuring 0,14 mm., 

 the proximal shorter, 0,09 mm. long. Posterior margin of the carpus ending in a spine and 

 armed with two spinules, that are inserted somewhat nearer to the merus than to the propodus. 

 Anterior margin of the propodus ending in a spine, posterior with 7 spinules. Dactylus with 

 accessory claw as in A. aculeipes. 



The egg-bearing female from Stat. 282 is 10 mm. long. The merus of the 3'''^ legs is 

 5-times as long as broad in the middle; the posterior margin of the inner surface carries 14 

 spinules that slightly increase in length from the proximal (0,05 mm.) to the distal ones (0,14 mm.). 

 Posterior margin of the carpus with one spinule, situated somewhat nearer to the merus than 

 to the propodus. Eggs few in number, globular, diameter 0,52 mm. broad. In the male, long 

 10,5 mm., from Stat. 285 the carpal joints of the 2°<i legs are 0,44 mm., 1,38 mm., 0,34 mm., 

 0,36mm. and 0,54mm. long; chela 1 mm. long (palm 0,46mm., fingers 0,54mm.). Merus of 

 3''' legs with 9 spinules on the posterior margin of its inner surface, carpus with one spinule 

 on the middle of the posterior border. In the egg-bearing female that has the same size, the 

 merus of the 3'*^ legs is 1,92 mm. long and 0,42 mm. broad in the middle, almost 5-times as 

 long as broad and the inner posterior margin is armed with 9 or 10 spinules; carpus with 2 

 spinules on the middle of posterior margin. 



The younger female from Stat. 299 is 10,5 mm. long; the merus of the 3''<^ legs shows 

 the same measurements as in the egg-bearing specimen from the preceding station, but the 

 inner margin carries 14 spinules, that, like in the other specimens, increase in length from the 

 proximal to the distal ones; there are also 2 spines on the middle of the posterior border of 

 the carpus. The other egg-bearing specimen is 14 mm. long. The scaphocerite is a little longer 

 than the carpocerite and the blade or lamina reaches almost to the end of the antennular 

 peduncle. Carpus of 3''' legs with two spines on the middle of posterior margin, inner margin 

 of the merus with 6 or 7 spinules. 



A. actileipes var. tryphopiLs Nob. from Marokau ought probably to be considered as a 

 proper species (Bull. Museum Paris, 1906, N°. 5, p. 257). 



General distribution: Ternate (de Man) ; Arzana Island, Persian Gulf (Nobili) ; 

 Maldive and Laccadive Archipelago (Coutiere); Djibouti (Coutiere) ; Fernando- Veloso (Coutiere). 



717. Alpheus Arethusa de Man. 



J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 100. 



Stat. 60. April 27/28. Haingsisi, Samau Island, Timor. Reef, i male and i ova-bearing 

 female. 



A new species' of the Criiiitiis subgroup, closely related to A. styliceps Cout. 



The two specimens are 10 mm. long. Frontal margin as in A. styliceps^ but the rostrum 

 much less prominent, smaller, hardly half as long as broad at its base and reaching only to the 

 2°-^ sixth of the visible part of i^' antennular article; at either side of the short rostrum the 

 frontal margin runs obliquely backward, in a much less degree, however, than in A. styliceps 

 and then passes with an obtuse angle to the rounded, unarmed walls of the orbital hoods. 



