300 



gular teeth^ two at the outer angles and oue at either side of 

 the middle, the submedian teeth half as long as the outer. 



Frontal teeth as in Syn. pachymeris (vide : Coutière, Alpheidae 

 Mald. and Laccad. Archip. 1905, PI. LXXI, Fig. 9). Antennular 

 peduncle 4 times longer than thick at distal extremity of median 

 article, visible part of basal article one and a half as long as 

 the 2nd, 3rd a little shorter than 2nd. Stylocerite and outer 

 antennae as in Syn. pachymeris, the carpocerite 5 times as long 

 as thick in the middle, but the terminal spine of the scaphocerite 

 is as long as the antennular peduncle and the narrow scale 

 reaches to the extremity of median article. 



Telson as in Sijn. quadrispinosus, as regards the arrangement 

 of the spinules of the upper surface and the form of the posterior 

 margin, but the proportion between the latter and the length of 

 the telson is 2,8, in Syn. quadrispinosus, 3,2 — 3,4. 



Relative dimensions of small chela : Fingers 1 ; total length 3, 

 height 1,2; the shape of this chela is stouter than in Syn. 

 quadrispinosus, fingers as in this species. 



Relative dimensions of 3rd pair: Meropodite 2,71; carpus 1; 

 propodite 1,77, meropodite 1,53 times longer than propodite. 

 Meropodite 3,05 times, propodite 4,2 times longer than wide, both 

 of a stouter shape than in Syn. quadrispinosus; propodite with 

 8 spinules, dactylus as in that species. 



O va large, 1,3 mm. long. Length 12 mm. 



14. Synalpheus trispinosus, n. sp. 



Station 51. Madura-bay and other localities in the southern 

 part of Molo-strait. Depth from 54 — 90 M. 



A new species of the Biunguiculatus-grou^, distinguished, like 

 S^i/n. triacanthus, n. sp., by the posterior margin of 6th abdorainal 

 somite being trispinose. Frontal region prominent, rostrum slender, 

 acuminate, with the tip curved upward and just reaching beyoud 

 Ist antennular article; lateral spines also slender and acuminate, 

 reaching to the middle of that article. Antennular peduncle 4,5 

 times as long as wide at distal extremity of median article, the 



