423 



that are, like those of the fourth, unarmed and 7,5-times as long as broad; the carpus 

 measures three-fourths of the propodus, which is 3-times as long as the slender, slightly 

 curved dactylus. 



f 61. Alpheus Polyxo de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 108. 



Stat. 240. November 22 till December i. Banda-anchorage. Black sand, coral and Lithothamnion- 

 bank in iS — 36 m. i male and i egg-bearing female. 



Both specimens are adult, the male is 22 mm. long, the female 25 mm., the former 

 lacks the large cheliped and in the female both chelipeds are missing. These specimens evidently 

 belong to a new species, but it is doubtful whether they pertain to the Edivardsii group or not. 



The rostrum of the male is acute, twice as long as broad at its base and reaches to 

 the end of first antennular article ; in a lateral view the lower margin projects almost horizontally 

 forward, while the upper appears to ascend, slightly, from the point backwards. The rostrum 

 is continued as a rather low and rounded carina which is separated by moderately broad, 

 though rather deep grooves from the orbital hoods and which, somewhat widening backward, 

 passes at the base of the latter into the surface of the carapace. In the female the rostrum 

 appears almost as broad at its base as it is long and it extends only to the distal fourth of 

 the visible part of first antennular article; the rostral carina is also broader than in the male 

 and much resembles that of A. Atidouini. At either side of the rostrum the frontal margin 

 runs in the female S-like, obliquely forward and outward, in the shape of a rounded prominence, 

 which prominence, in the male much less marked, appears in a lateral view acute, like in 

 A. eiicliirzis Dana. 



Carapace and abdomen are smooth and glabrous. Telson 3,4-times as long as its posterior 

 margin is broad, anteriorly twice as broad as the posterior margin; upper surface slightly flattened 

 in the middle, but not grooved, smooth and glabrous. Spinules of the upper surface rather large, 

 inserted nearly midway between the mid-line of the telson and the lateral margins ; anterior 

 pair inserted just in front of the middle, posterior pair almost one and a half as far distant 

 from the posterior margin as from the anterior pair; posterior margin slightly prominent in 

 the middle, inner spinules near the postero-lateral angles measuring one-third the width of the 

 posterior margin. Basal joint of caudal swimmerets armed with two short spines of equal length; 

 inner uropod broad, flattened above with the posterior margin rounded, exopod with the movable 

 spine at the postero-lateral angle uncoloured. 



Second antennular article in the male 2,4-times, in the female 2,6-times as long as thick 

 in the middle, one and a half as long as the visible part of the first ; this visible part appears 

 hardly longer than the third article. Stylocerite terminating in a slender spine that reaches just 

 beyond the first article, one-sixth or one-eighth the length of the second. 



Basicerite armed on the lower side with a small spine, 0,5 mm. long, reaching about 

 to the distal third of the visible part of first antennular article; carpocerite projecting beyond 

 the end of the antennular peduncle about by one-third the terminal article. The scaphocerite, 



291 



