1. c. 191 i (text), p. 413, 1 9 1 5 (plates), PI. XXIII, fig. 99 and 99«), especially the former. In 

 these species the rostrum is continued as a low rounded ridge, respectively as a narrow, obtuse 

 carina, that only extends as far as the corneae of the eyes. The small chela of the female of 

 A. leviusculus is almost 5-times as long as high, in A. Bastardi only 4,1-times, in a female 

 of A. microrhynchus from Bangkok, long 43 mm., described by me in 1898 (Mémoires Soc. 

 Zoolog. de France, 1898, p. 318), the palm of the small chela was 3-times as long as high. 

 In A. microrhynchus the infero-internal margin of both chelipeds is unarmed and the i st carpal 

 segment of the 2 nd pair appears in the full-grown female more than twice, in younger speci- 

 mens almost 3-times as long as the 2 nd . A. microrhynchus is moreover a species of large 

 size, attaining a length of 85 mm. 



General distribution : Minikoi (Coutière) ; Mascate (Coutière) ; Madagascar (Coutière) ; 

 Djibouti (Coutière); Panama (Coutière). 



33. Alpheus euchirus Dana. PI. IV, fig. 18 — 18 ó. 



? Alplieus euchirus J. D. Dana, U. S. Explor. Exp. Crustacea, p. 545, PI. XXXIV, figs. 6a — f. 

 Alpheus euchirus J. G. de Man, Siboga Exp., Monogr. XXXIXrf', Part II, Family Alphei- 

 dae, 191 1 (text), p. 434. 



Stat. 273. December 23/26. Anchorage off Pulu Jedan, east coast of Aru-islands. (Pearl-banks). 



13 m. Bottom sand and shells. 1 male of medium size. 

 1 male and 1 egg-bearing female collected by Prof. SLUITER in the Bay of Batavia. 

 1 full-grown ova-bearing female collected 10 May 1909 by Mr. VAN NOUHUYS west of Segli, 

 north coast of Sumatra, at a depth of 72 — 126 m. 



The male from Stat. 273 and the two specimens from the Bay of Batavia belong to 

 that species which was described by me in detail in 1897 as a variety of A. hippothoc de Man 

 (in: Zoolog. Jahrb. (Spengel) IX. Abth. f. Syst. p. 754, PI. 36, figs. 66 — 66^ and in: Notes 

 from the Leyden Museum, XX, 1898, p. 210), and to which belonged also the 10 specimens 

 described in 191 1 (1. c). The male from Stat. 273, which bears an epicarid in the left side of 

 the carapace, is 19 mm. long, the large cheliped is placed on the left side, the small one on the 

 right. The large chela is 9 mm. long, palm 5,5 mm. long and 3,75 mm. high, tooth at the 

 distal end of the upper border of the palm, behind the groove, subacute ; acute tooth on the 

 infero-internal margin of the merus well-developed, while it is very small and rudimentary on 

 the merus of the smaller cheliped. Small chela 6,5 mm. long, palm 3 mm. long, slightly shorter 

 than the fingers, and 1,9 mm. high. Tooth on the meri of the 3 rd and 4 th pair of legs well- 

 developed, like in fig. 66 ^ (1. c). 



The male and the female from the Bay of Batavia are respectively 25 mm. and 27 mm. 

 long, the i st peraeopods are wanting in both. 



The full-grown female from the north coast of Sumatra, that is nearly 37 mm. long, does 

 not quite agree with the preceding specimens. In this specimen namely (Fig. 18) the orbital hoods 

 project each forward as a vertically-compressed rounded lobe, that extends along 

 the proximal third of the free part of the rostrum and that laterally is distinctly separated 

 from the antero-lateral border of the hood by a slipht emaroination : in a lateral view of the 



