Boo7ie, Crustacea, Cruise of "Alva," 1931 145 



times there is a spinose dentition on the proximal portion; the 

 apex is an acuminate, upcurved spine. The upper finger is similar 

 and subequal ; the fingers, when closed, meeting throughout their 

 entire length along the carinate outer lateral margin, the tips 

 overlapping but with a distinct elliptical trough separating them, 

 when viewed from the inner lateral surface. Numerous tufts of 

 long setae occur on the lower, inner and upper surfaces of the 

 palm and on all outer surfaces of the fingers, being especially 

 abundant along the lateral margins of the cutting edge and at the 

 tips of the fingers. 



The second left leg, adjacent to the small cheliped, is very- 

 slender; the ischium, 5.5 mm. long; the merus, 5.8 mm. long; the 

 carpus : first joint, 3.0 mm. long; second joint, 2.5 mm. long; third 

 joint, 1 mm. long; fourth joint, 1 mm. long; fifth joint, 1.8 mm. 

 long; propodus: palm, 1 mm. long; fingers, 1 mm. long, subequal, 

 meeting throughout their length, tips fringed with bristles. The 

 second right leg is similar. 



The first ambulatory leg has the ischium two-fifths as long 

 as the merus ; the merus is half as long as the carapace ; the carpus 

 is three-fifths as long as the merus, clavate, widening distally; 

 the propodus is one-third longer than the carpus, much more com- 

 pressed laterally, thickish, as wide as long, armed on the inferior 

 lateral margin with a double longitudinal series of six pairs of 

 articulate, acuminate spines ; the dactyl is two-fifths as long as 

 the propodus, curved, thickish, with strong, pointed tip. The 

 fourth and fifth pairs of legs are similar to the third pair, but 

 are successively shorter; the fifth pair is also definitely thinner. 



References: Alpheus rapax, Fabricius, J. C, Suppl. Entom. 

 Syst., 1798, p. 405. — DE Man, J. G., in Max Weber's Zool. 

 Ergebn. II, 1892, p. 404. — Coutiere, H., Les Alpheidae, in 

 Ann. Sci. Nat. Zool. Paris, ser. 8E, t. IX, 1899, p. 233, 

 fig. 284. ; Fauna and Geog. Laccadive and Maldive Arch., vol. 

 II, pt. 3, 1902, p. 904. — Doflein, F., Munchen Akad. Wiss. 

 Abh. Math.-Phys., vol. LXXIII, 1900-1902, p. 634.— NOBILI, 

 G., Boll. Mus. Zool. Univ. Torino, t. XVIII, 1903, p. 7, art. 

 no. 455; Ann. Sci. Nat. Paris, ser. 9, t. IV, 1906, p. 33. — 

 DE Man, J. G., Mem. Soc. Zool. France, t. XXII, 1909, p. 

 147, pi. 7, figs. 1-8 ; "Siboga"-Expeditie, Monogr. Decapoda, 

 pt. 2, Family Alpheidae, Monogr. 39A-1, 1911, p. 385. 



