302 



curved upward and reachiug to the 2nd third part of mediau 

 article; lateral spines also slender and acumiuate, slightly directed 

 ontward and upward, much shorter than the rostrum, and reaching 

 almost to the middle of Ist antennular article. Antennal region 

 as in Syn. trispinosus, but the stylocerite very slender, spiniform, 

 except its basal part, and longer than the rostrum, just reaching 

 beyond the middle of median article; carpocerite 4,5 — 5 tiraes as 

 long as wide. 



Anterior pair of legs nearly as in Syn. trispinosus, but the 

 smaller chela less high, this chela beiug 3,1 times as long as 

 high; its relative dimensions are; fingers 1; total length 2,45; 

 height 0,77. First segment of carpus of 2nd legs 5,2 times as 

 long as thick at distal extremity, '/,g longer than the sum of the 

 four following. Relative dimensions of the following legs as in Syn. 

 trispinosus, but the members are more slender and the meropodites 

 are unarmed ; meropodite of 3rd pair 4,5 times as long as wide, 

 propodite 6,6 times. Dactylus of 3rd pair ^j^ of the propodite, 

 dorsal hook twice as long as the ventral. Length 16 mm. 



16. Synalpheus bispinosus, n. sp. 



Station 33. Bay of Pidjot, Lombok. Depth 9—22 M. 

 Station 240. Banda-anchorage. Depth from 9 — 36 M. 



A new species of the Biunguiculaius-group, closely approaching 

 Syn. biunguiculatus (Stimps.) Coutière, and its variety exilipes 

 Cout., but distinguished from all the species of this genus by 

 the posterior margin of 6th abdominal somite being bispinose, 

 the outer angles beiug produced into an acute tooth. Rostrum 

 in the male 4 times, in the female 5 times as long as wide in 

 the middle, reaching in the former almost to the middle, in the 

 latter to the distal third part of Ist antennular article; lateral 

 spines as the var. exilipes Cout. (Alpheidae Mald. and Laccad. 

 Archip. 1905, PI. LXXI, Fig. 10), a little shorter than the 

 rostrum. Telsou 3,44 times as long as the posterior margin is 

 wide, the latter as in Syn. biunguiculatus (Coutière, l.c, Fig. 8d), 



