40g 



base of the immobile finger as in A. pareuchirus, but the lower margin of the palm is feebly 

 ridged longitudinally; the fingers resemblc those of A. pareuchirus. 



Only two specimens, both from Stat. i 1 6, bear the smaller chcliped, viz. the adult egg- 

 bearing female and a younger specimen. Merus, in the adnlt female, one and a half as long 

 as that of the Iarger cheliped, also more slender, 7-times as long as broad in the middle ; tooth 

 at the far end of the infero-internal margin a little smaller, on the middle also 2 small spinules. 

 Chela as long as the carapace, rostrum included; fingers almost one and a half as long as the 

 palm, the proportion being as 7:5, slender, tapering, shutting together and with the acuminate 

 tips crossing one another. Palm almost cylinclrical, 2,5-times as long as high; upper border 

 slightly constricted near the articulation of the dactylus with a tracé of the longitudinal groove 

 on the outer face, perhaps also of that on the inner, for the rest smooth and glabrous. 



In the young specimen long 14,5 mm. from Stat. 114 the carpal segments of the second 

 legs are 1,8 mm., 1,22 mm., 0,45 mm., 0,5 mm. and 0,8 mm. long, the second segment 7-times 

 as long as thick; chela 1,34111111. long (palm 0,66 mm., fingers 0,68 mm.). In the adult, egg- 

 bearing female from Stat. 116 the carpal segments are 2,52 mm., 1,6 mm., 0,64 mm., 0,7 mm. 

 and 1 mm. long, the second segment 7-times as long as thick; chela 1,72 mm. long (palm 

 0,8 mm., fingers 0,92 mm.). These numbers show that the first segment of the slender carpus 

 is one and a h a 1 f as long as the second and that the second is one and a half as long 

 as the 5 th , that the chela, finally, is slightly longer than the 2 nd segment. In A. pareuchirus, 

 however, the 2 nd segment is not shorter than the i st . 



Of the three posterior legs the ischium is armed with a movable spine at the base; 

 these legs are very slender, still more than those of A. pareuchirus. So e. g. are the meri 

 of the third legs in the adult female from Stat. 116 9-times as long as broad, their distal 

 extremity is quite unarmed ; carpus measuring three-fifths the length of the merus, slender, 

 8-times as long as thick distally; propodus one-third longer than the carpus, the proportion 

 being as 4:3, slender, the propodus being 15- or 16-times as long as broad, the posterior 

 margin with 7 spines that gradually increase in length, the spine at the distal extremity being 

 half as long as the dactylus. Both margins of the propodus are beset with some long setae 

 and long spiniform setae occur at the distal extremities of both margins. Dactylus very slender, 

 simple, one-third the length of the propodus, slightly curved and flattened. In younger specimens 

 the propodus appears a little less slender, the dactylus comparatively somewhat longer. 



f51. Alpheus Couticrei de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 107. 



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



bottom. 1 male and 1 egg-bearing female. 

 Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- 



point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 egg-bearing female. 



A remarkable new species of the Edzuardsü group, which I have the pleasure to dedicate 

 to the learned Carcinologist, by whom science has been enriched with such important works 

 on the Family Alpheidae. 



277 



