234 



an acute angle with the other, is half as thick at its base as the ventral and not longer 

 than it. 



The relative dimensions of the fifth legs are: merus 1,5; carpus 1 ; propodus 1,87; the 

 merus is 4,5-times, the propodus 8-times as long as wide. The dactylus measures one-fourth 

 the length of the propodus and has the same form as that of the third legs, being 2,6-times 

 as long as wide at its base ; the hooks present also the same features, but the dorsal hook is 

 hardly longer than the other. 



f13. Synalpheus Pococki Cout. 



Synalpheus neomeris var. Pococki H. Coutière, in: Buil. Soc. Entomol. France, 1S98, N° 7, 



p. 167 and in: Buil. Muséum de Paris, 1900, N° 8, p. 411. 

 Synalpheus Pococki H. Coutière, in: Proc. U.S. Nat. Museum, 1909, p. 9. 



Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 

 13 m. Sand and shells. 1 egg-bearing female. 



This specimen is 12,5 mm. long and fully accords with the description. The three frontal 

 spines project straight forward and are quite glabrous; the slender rostrum which is 3-times as 

 long as wide at base, reaches almost the end of first antennular article whereas the supraorbital 

 spines that are decidedly directed inward, are somewhat shorter, extending to the distal third 

 of the visible part of first article. 



The second article of the antennular peduncle measures almost two-thirds the visible 

 part of the first, third article as long as the second ; the stylocerite reaches to the distal fourth 

 part of second article. Carpocerite a little longer than the antennular peduncle, surpassing it 

 only by one-third the distal article ; the terminal spine of the scaphocerite, the outer margin 

 of which is distinctly concave, reaches as far forward as the carpocerite and projects by one- 

 fifth of its length beyond the rounded tip of the rather broad scale which is but a little shorter 

 than the antennular peduncle. The lower spine of the basicerite projects straight forward to the 

 end of first antennular article, whereas the upper spine measures, in a lateral view, one-third 

 of the lower and is directed upward. 



The telson resembles that of Syn. streptodactylus. The proportion between its length 

 and the width of the posterior margin, the outer angles of which are acute, though not at all 

 prominent, is 2,86, proportion between the greatest width and that of the posterior margin 2,1; 

 like in this species, the spinules of the upper surface that are 0,1 mm. long, are situated just 

 in front of the middle, the proportion between the distance of the anterior pair from the 

 posterior margin and the length of the telson being 1,9; the two pairs of spinules are situated 

 rather close together, the proportion between their distances from the posterior margin being 1,45. 



In both chelipeds the upper margin of the merus ends in a small spinule. The small 

 chela which is 2,25 mm. long, presents the same proportions as that of Syn. streptodactylus: 

 this chela is namely 3,2-times and the palm 1,95-times as long as high, whereas the proportion 

 between the length of the chela and that of the fingers is 2,56. First carpal segment of second 

 legs 4,71-times as long as thick distally, a little shorter than the following segments taken 

 together. 



