Boo7ie, Crustacea, Cruise of "Alva," 1931 21 



Island, Waterland Island (Dana) ; Hao Island (Nobili) ; Tagatau, 

 Hikueru, Marutea, Fakahina, Rikitea, Puamu, Taraourouroa, 

 Kamaka (Nobili) ; Bencoelen (Nobili). 



Material examined: Twelve specimens taken on the reefs, 

 at Apia, Samoa, September 5, 1931, by the "Alva." One oviger- 

 ous female carries about 500 eggs. 



Technical description : Carapace elongate, precervical por- 

 tion well calcified, rostrum a minute point, the antennal points 

 even less defined; the posterior margins of this region are 

 rounded. The postcervical region is widest across the branchial 

 region, the integument, including that of the median plate, flaccid. 

 The abdomen is well developed, soft, spirally coiled ; the terga are 

 thin, widely separated on the second to fifth segments, inclusive; 

 there are, on the left side, four biramous appendages, one on each 

 segment. On the fifth segment the appendage is reduced. The 

 telson and uropoda are symmetrical, being larger on the left side. 



The eyestalks are stout, slightly curved, barely equal to, or 

 about a millimeter longer than, the width of the frontal border of 

 the carapace, or about one-sixth longer than the antennular pe- 

 duncles. The antennal peduncles are only three-fourths as long 

 as the eyestalks. The ophthalmic scales are sublobate, with the tips 

 acute, directed inward. The antennal acicule is stout, triangulate, 

 with both lateral margins serrulate, the tip acute, reaching almost 

 to the base of the distal peduncular segment; the flagellum is 

 stout, extending to midway the finger of the large cheliped. 



The chelipeds are decidedly unequal, the left one being de- 

 cidedly the larger ; both are smooth, unarmed, the margins being 

 entire. The left one is one and one-third times as long as the entire 

 carapace, with the merus short, trigonal, higher than long, the 

 upper surface rounded, with a deep, oblique groove across the 

 proximal inner portion ; the height of the palm equals the upper 

 margin; the outer surface is rounded, paved with microscopic 

 granules; the lower finger is short, the tip pointed and there is 

 one triangulate tooth on the cutting edge. The upper finger is 

 more curved, also pointed distally. There are several clusters of 

 bristles on the inner surface of the cutting edges of both fingers, 

 which meet throughout their length. On the lower proximal part 

 of the inner surface of the palm, there are several flatfish, squami- 

 form scales or elevations. The right, or smaller, cheliped is much 



