397 



besct with rather long setae. Dactyli slightly arcuate, measuring two-thirds of the propodus; 

 they are lanceolate, in the middle much broader than high. 



Fourth legs shorter than the 3 rd , for the rest resembling them. 



Unless the contrary was remarked, the preceding description was taken from the male 

 captured at Stat. 279. 



Alpheus rapacida differs from A. rapax de Haan by its much smaller size, by the second 

 antennular article being little longer than the first, by the slender shape of the large chela 

 and probably by other characters. 



f 44. Alpketis lepidus de Man. 



J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 106. 



Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 



54 — 90 m. Fine grey sand ; coarse sand with shells arid stones. 1 egg-bearing 



female and 1 young specimen. 

 Stat. 114. July 8. o°58'.5 N., I22°55'E. Kwandang-bay-entrance. 75 m. Hard sand, very fine. 



4 specimens, one of which with eggs. 



A new species of small size of the Brevirostris group, closely allied to A. rapacida 

 de Man. 



The largest specimen, one from Stat. 114, is 17 mm. long, the two egg-bearing females 

 14 mm. and 16 mm. The pointed, acute rostrum reaches a little beyond the middle of the 

 visible part of first antennular article and is almost as broad at its base as it is long ; the 

 rostrum, that projects straightly forward, is continued in a narrow, sharp and prominent 

 carina, that extends back w ar d to behind the middle of the cara p ace. The 

 interorbital part of this carina which is the most striking feature of this species, is concealed 

 by the rounded orbital hoods in a lateral view of the carapace and is separated from them 

 by narrow, moderately deep grooves. 



Orbital or frontal region rather narrow, little more than half as broad as the anterior 

 margin of the carapace. 



Telson narrow, twice as long as broad anteriorly and 4-times as long as the posterior 

 margin is broad. Second antennular article little (one-third) longer than the visible part of the 

 first and twice as long as thick ; third article little more than half as long as the second. ' 

 Stylocerite very broad, the terminal spine almost reaching to the end of i st antennular article. 



Carpocerite reaching beyond the antennular peduncle by one-third of the third article ; 

 inferior spine of basicerite small, shorter than the rostrum, reaching to the middle of the visible 

 part of i st antennular article. The scaphocerite, the outer margin of which is slightly concave 

 and which just extends beyond the carpocerite, appears about 3-times as long as broad, the 

 blade is rather narrow anteriorly and as long as the antennular peduncle, while the terminal 

 spine extends by one-third of its length beyond the tip of the blade. 



Terminal joint of external maxillipeds slender, slightly narrowing distally, 4,5-times as 

 long as broad at base; penultimate joint half as long and a little more than one and a half 

 as long as thick. 



265 



SIBOGA-EXPEDIÏIE XXXIX a'. 51 



