333 



(1,85 mm.) is also one-third longer than the preceding joint (1,35 mm.). In adult specimens 

 the posterior margin of the propodus which is 11 -times as long as wide, bears 9 spines and 

 2 long setiform spinules occur at the far end of the anterior margin. The dactyli which measure 

 almost one-third of the propodi, differ from those of the variety laetabilis by their posterior 

 margin bearing no accessory claw, the margin being entire, but, like in that variety, 

 one observes at the distal third of the anterior margin a spine or tooth pressed against 

 it and at the base of which a few setae are inserted. This tooth, that is present on the 

 dactyli of the three posterior legs, may easily be overlooked and occurs perhaps also in the 

 typical form. 



f 2. Alphe7t.s Hailstonei Cout. var. laetabilis de Man. 



J. G. de Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 98. 



Stat. 49''. April 14. 8°23'.5 S., II9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 2 young males. 

 Stat. 65^ May 6. 7°o'S., I20°34'.5E. Near Saleyer. From 400 to 120 m. Pale, grey mud 



changing during haul into coral bottom, i young specimen. 

 Stat. 154. August 14. o°7'.2 N., I30°25'.5E. Bougainville Strait. 83 — 59 m. Grey muddy sand, 



shells and Lithothamnion. 12 specimens, 2 of which with eggs. 

 Stat. 240. November 22 till December i. Banda-anchorage. From 9 — 36 m. Lithothamnion- 



bank in 18 — 36 m. 6 specimens, 2 of which with eggs. 

 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. i adult ova-bearing 



female and 4 young specimens. 

 Stat. 2S5. January 18. 8° 39'.! S., I27°4'.4E. Anchorage South coast of Timor. 34 m. On the 



limit between mud and coral. Lithothamnion. i ova-bearing female. 

 Stat. 303. February 2/5. Haingsisi, Samau-island. Up to 36 m. Lithothamnion. i young specimen. 

 Stat. 310. February 12. 8° 30' S., 119° 7'. 5 E. Sapeh-Strait. 73 m. Sand with few pieces of dead 



coral. 2 adult females with eggs. 



These specimens belong to the other one of the two varieties of A. Hailsto7iei, that seem 

 to represent this species, proper to the Maldive and Laccadive Islands, in the Indian Archipelago. 



The largest specimens, ova-bearing females, are 15 mm. long. The rostrum, reaching to 

 the extremity or almost to the extremity of i^' antennular article, is separated anteriorly at 

 either side by a shallow and narrow groove from the orbits, the orbital spines agree with those 

 of the typical species. Antennular peduncle as in the latter, but the pointed stylocerite reaches 

 to the apex of 1^' joint; carpocerite often as long as the antennular peduncle. 



Upper margin of the merus of the large cheliped with 4 or 5 movable spinules, one or 

 two also on that of thfe ischium; inner margin of this joint with 3, that of the merus, which in 

 the typical species is unarmed, with 8 or 9 similar, movable spinules. Larger chela in adult 

 specimens a little broader (higher) than in the typical form, but for the rest resembling it; 

 smaller cheliped also as in the typical form. 



Fourth carpal segment of 2^'^ legs distinctly shorter than the 2°^ and in a less degree 

 also than the 5*, while, according to Coutiere's figure (Alpheidae Maid, and Laccad. Archip. 

 1905, PI. LXXIV, Fig. iS), the 2°<i, the 4"^ and the 5"^ segment should be of equal length 

 in the typical species: in the variety laetabilis the fingers are one and a half as long as the 



201 



SIBOGA-EXPEDITIE XXXIX a'. 43 



