301 



three articles iu proportion to oue anotber as 16:11:8. Stylo- 

 cerite just as long as the rostrum. Carpocerite 6,5 times longer 

 than wide, as loug as anteuuular peduucle, lateral spiae of basi- 

 cerite a little shorter than stylocerite, spine at upper angle half 

 as long as the lateral. Terminal spine of scaphocerite a little 

 longer than the peduncles, scale a little shorter than antennular 

 peduncle. 



Sixth abdotninal soraite 1,6 times as wide as long, posterior 

 margin with au acute spine at the outer angles and with a third, 

 slightly shorter, in the middle. ïelson 2,47 times as long as the 

 posterior margin is wide, posterior margin as in Syn. acanthitelsonis 

 Cout. 



Relative dimensions of larger chela: fingers 1, total length 4,3, 

 height 1,53; anterior margin of the palm with a conical tubercle 

 directed obliquely upward. Relative dimensions of smaller chela: 

 fingers 1; total length 2,64; height 0,95, Dactylus tapering, 

 slender. 



Second legs slender; Ist carpal segment 6,55 times longer than 

 thick at distal extremity, 1,81 times as long as the sum of the 

 four followiug. 



Proportions of 3rd pair: Meropodite 2,38; carpus 1; propodite 

 1,87; meropodite 3,36 times as long as wide, its posterior margin 

 with 9 short spinules, inserted alraost along the whoJe length. 

 Meropodite of 4th pair with 7 spinules. 



Ova numerous, 0,8 — 0,88 mm. long. 



Length of ova-bearing female 19,5 mm. 



15. Synalpheus triacauthus, n. sp. 



Station 289. Lat. 9° O'. 3 S., long. 126° 24'. 5 E. Depth 112 M. 

 Living in Solenocaulon Gray. 



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

 Syn. trispinosus, by the posterior margin of 6th abdominal somite 

 being armed with three spines, oue at the outer angles and oue 

 in the middle. Telson also in this species, hut the spiniform 

 angles less prominent. Rostrum slender, acurainate, with the tip 



