some differences from the female taken off the island of Waigeu. The rostrum is shorter, 

 2,5-times as long as wide at base and extends to the distal third of the visible part of basal 

 antennular article. Third antennular article hardly shorter than the second. Lateral spine of 

 basicerite slightly longer than the stylocerite that reaches to the middle of median article. 



The telson is 2, 41 -times as long as the posterior margin is wide, proportion between 

 the latter and the width at base 1,94. The spinules of the upper surface are 0,15 mm. long, 

 but arranged exactly as in the specimen from Stat. 152, the proportion between the length 

 of the telson and the distance of the anterior pair from the posterior margin being 1,83, while 

 the proportion between the distances of both pairs from the posterior margin is indicated by 

 the number 1,7. 



The second and following legs present a less slender form than in the other specimen. 

 Merus of second legs 5-times as long as wide, first carpal segment 4,5-times as long as thick, 

 just as long as the sum of the four following. Relative dimensions of third pair: merus 2,1; 

 carpus I; propodus 2,1. Merus 3,2-times, propodus 5,6-times as long as wide, the latter with 

 7 spinules, long 0,16 — 0,2 mm. Dactylus two-sevenths the propodus and 2,7-times as long as 

 wide. Eggs 0,8 — 0,88 mm. long. 



General distribution: Djibouti, Mascate, Mahe, Maldive and Laccadive Archi- 

 pelagoes (Coutiere). 



715^. Synalpheus paVaneoincris Cout. var. Jialiuaherensis de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909, p. 122. 



Confer: H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 872, PI. LXXI, fig. 7. 



Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. Reef, i male and i egg- 

 bearing female. 



On Plate LXXI of the quoted paper, Fig. 7 apparently represents the "'oxyceros' form, 

 for which Coutiere has recently created the name Syn. paraneomeris prolatus (in : Proc. U. S. 

 Nat. Mus. 1909, p. 9), while Fig. 7' represents the typical species; unfortunately the author 

 did not indicate to which form the other figures belong, to the typical species or to the sub- 

 species prolatus. Though according to Coutiere this species is a rather variable form, I prefer 

 to describe the two specimens taken in the Halmaheira Sea as a distinct variety. 



Rostrum triangular with converging lateral margins as in the typical species (1. c. Fig. 7'), 

 but longer, reaching almost to the end of the first antennular article, acute, a little more than 

 twice as long as broad at its base; lateral spines also pointed and acute, a little shorter than 

 the rostrum, as in Fig. 7, but with the inner margins concave. 



The telson of the male much resembles Fig. 7^ (1. c), but the spinules of the upper 

 surface that are 0,12 mm. long, are situated a little more backward; in the female which is 

 larger, the telson is somewhat longer, the width of the posterior margin being just one-third 

 the length (Table A). 



The antennular peduncle resembles that of the va,r\^X.y prolatus (Coutiere, I.e. Fig. 7); 

 the second article, one-fourth shorter than the visible part of the first, appears distinctly somewhat 



