347 



Telson of the largest specimen 2,45 mm. long, 1,3 mm. wide at base and 0,33 mm. at 

 the posterior margin, the telson being more than 7-times as long as the posterior margin is 

 wide, while the latter is one-fourth of the width at the base. 



In an egg-bearing female, long 15 mm., the carpal segments of the left leg of the 

 2"d pair are 0,6 mm., 1,6 mm., 0,4 mm., 0,4 mm. and 0,6 mm. long; the chela is 1,2 mm. long 

 (fingers 0,48 mm., palm 0,72 mm.). For the other leg these numbers are 0,7 mm., 2,24 mm., 

 0,5 mm., 0,55 mm. and 0,8 mm.; the chela is 1,5 mm. long (fingers 0,7 mm., palm 0,8 mm.). 

 In larger specimens the 2°^ segment appears comparatively a little longer. 



General distribution: Hulule Male Atoll (Coutiere); Samoa Islands (Coutiere); 

 Tague Island (Coutiere). 



713. Alphetis malleodigitus (Sp. Bate). 



Betaeus malleodigitus C. Spence Bate, Report Challenger Macrura, 1888, p. 565, PI. CI, Fig. 5. 



Alpheus malleodigitus J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. XXV, 1902, p. 866. 

 \ Alpheus plirygianus H. Coutiere, Alpheidae Maid, and Laccad. Archip. 1905, p. 886, PI. 



LXXVII,'Fig. 25. 

 \ Alpheus per sicus G. Nobili, in: Bull. Scientif. France et Belgique, XL, 1906, p. 33. 



Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion- 



bottom. 28 specimens of small size, mostly young, though 6 are provided with eggs. 

 Stat. 115. July 9/1 1. East side of Pajunga-island, Kwandang-bay. Reef-exploration, i adult 



male and i adult, ova-bearing female. 

 Stat. 142. August 5/7. Anchorage off Laiwui, coast of Obi Major. Reef i adult, egg-bearing 



female. 

 Stat. 149. August lo/ii. Fau-anchorage and lagune. West coast of Gebe-island. Reef i 



young male. 

 Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings, including Pulu 



Pasi Tanette, near the North point of Saleyer-island. Reef. 6 adult specimens, 



3 of which with eggs. 



The largest ova-bearing females, those from Stat. 213, are 23 mm. long, the largest 

 male specimens 17,5 mm. In all these specimens the interorbital carina, which is subacute and 

 obliquely directed downward, ends in a very small, triangular rostrum, measuring about V^ or V. 

 the length of the visible part of i^' antennular article and hardly reaching beyond the orbital 

 margins. The 2°'^ antennular article, in adult specimens from the stations 115 and 213, 3-times 

 or almost 3-times as long as the visible part of the i^^ is slender, being in adult specimens 

 4,5 — 5-times as long as thick; the 3''' article, half as long as the 2'"i, is obviously longer than 

 the visible part of the i^'. Stylocerite obtusely pointed, a little shorter than i^' article. In adult 

 specimens the carpocerite extends to the middle or almost to the middle of 3''<i antennular 

 article; in the younger specimens from Stat. 96 the carpocerite often reaches not farther than 

 to the distal fourth part of 2°'^ article and such specimens bear a close resemblance to A. Danac 

 Cout., a species which perhaps once will prove to be a variety of A. malleodigitus. The 

 scaphocerite, the outer margin of which is concave, reaches, in adult individuals, to the distal 

 third, fourth or fifth part of 2^^ antennular article; the terminal spine is usually a little longer 

 than one-third the total length of the scaphocerite, sometimes half as long and the outer margin 



215 



