33i 



c„ Dactyli of three posterior legs simple. 



d x First carpal article of 2 nd legs almost twice or somewhat more 



than twice as long as 2 nd . 



e x Second article of antennular peduncle distinctly longer than 



the visible part of i st . 



/j Dactylus of smaller chela of the male hairy at the inner 



side, but presenting no hairy crest. Merus of 3 ld legs 3- 



times as lono- as wide in the middle. Fingers of the chelae 



of 2 nd legs longer than the palm Hippothoë de Man 



ƒ, Dactyli of smaller chela of the male with a hairy crest at 

 the inner side. Merus of 3" 1 legs 4 — 4,5-times as long 



as wide in the middle euchirus Dana 



e„ Second article of antennular peduncle a little shorter than the 

 visible part of i st . Larger chela with the notches rather 



small and short euchiroides Nob. 



(G. NOBILI, Ricerche sui Crostacei della Polinesia, 1907, p. 356, PI. I, fig. 6). 



d„ First carpal article of 2 nd legs as long or a little shorter than 2 nd . 



e x Merus of 3 rd legs 2,7-times as long as wide in the middle. 

 Merus of both chelipeds unarmed at the apex of infero- 

 internal margin. Dactylus of the small chela of the male 

 sharply carinate above, very hairy at the inner side, but 

 with no hairy crest funaftttensis Borr. 



e 2 Merus of 3 rd legs 4-times as long as wide. Merus of larger 

 cheliped with a spine at the apex of infero-internal margin. 

 Dactylus of the small chela of the male with a hairy crest 

 on the inner side edamensis de Man 



e s Merus of 3" 1 legs 6-cimes as long as wide. Larger chela about 

 3-times longer than high, this chela as also the smaller chela 

 and the 2 nd legs nearly as in A. pareuchirus Cout. . . Perezi Cout. 

 (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 22). 



I. Mcgacheles group. 



f 1. Alpheas Hailstonei Cout. var. assimulans de Man. 



J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 99. 



Stat. 260. December 16 and 18. S°36'.5S., I32°55'.2E. 2,3 miles N., 63° W. from the North 



point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 2 males and 



1 egg-bearing female. 

 Stat. 2S2. 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 young specimen. 

 Stat. 305. February 8. Mid-channel in Solor-strait off Kampong Menanga. 113 m. Bottom 



stony. 1 adult, egg-bearing female and 12 younger specimens. 



These specimens show some slight differences from the typical form of A. Hailstonei 



199 



