275 



Table B. 



N» I. NO 2. N" 3. NO 4. NO 5. 



of the third let 



I 



1,56 



1-5 

 3,18 



4 



IMerus 

 Carpus 

 Propodus 



Proportion between the merus and the propodus . 

 Proportion between length and width of merus. 

 Proportion between length and width of propodus. 



N" I female from Stat. 64; N" 2 male, N° 3 female from Stat. 282; N« 4 female from 

 Stat. 299; N" 5 measurements of the species occurring in the Maldive Archipelago, taken from 

 Fig. 8 c of Coutiere's paper. 



General distribution: Suez (Coutiere); Djibouti (Coutiere); INIaldive and Laccadive 

 Archipelago (Coutiere). 



f 3 I . Synalpheus aviabilis de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, 295. 



Stat. 240. November 22 till December i. Banda. From 9 — 16 m. Lithothamnion. i young 

 specimen, without eggs. 



A new species of the Biiingzikiilatus group, closely related to Syn. biinigiticulatus exi- 

 lipes Cout. (H. Coutiere, Fauna Maid, and Laccad. Archip. 1905, p. 874, PI. LXXI, Fig. 10). 



Rostrum acute, a little more than one and a half as long as wide at its base, slightly 

 reaching beyond the middle of the visible part of basal antennular article; lateral spines also 

 acute, one-fifth shorter than the rostrum, projecting straightly forward and separated from the 

 rostrum by broad intervals, the outer margins of which are sinuate at the base. 



Antennular peduncle 4,3-times as long as wide at the distal end of median article; 

 visible part of the basal article one and a half as long as the second, the latter a little lono-er 

 than wide at the distal end (proportion 5 : 4), the third article one-fifth shorter than the second ; 

 the three articles are in the proportion to one another as 8:5:4. .Stylocerite acuminate, as 

 long as basal article. 



Lower spine of the basicerite rather stout, a little shorter than the stylocerite and 

 than the outer border of the basal portion; upper angle unarmed, obtuse. Carpocerite 4,5- 

 times as long as wide in the middle, measured on the lower face, and surpassing the antennular 

 peduncle by the total length of third article. Outer margin of the scaphocerite slightly concave, 

 the terminal spine as long as the antennular peduncle and exceeding by one-fourth of its length 

 the rounded tip of the well developed scale that reaches to the 2"'' third part of the distal 

 antennular article. 



Telson quite characteristic, much narrowing backward. Its length equals just 

 4-times the width of the posterior margin, the latter one-third of the width at base; posterior 

 margin very prominent, semicircular, outer angles not marked, longer internal 

 spinules reaching far beyond the end of the telson, their length being in proportion to the 

 width of the posterior margin as 18 : 25. The spinules of the upper surface are small, of equal 



143 



