216 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Diagnosis: Carapace roughened, granular near margins; lateral 

 margins rounded; front with three shallow lobes; carpus about one and 

 a half times as long as wide, anterior margin unarmed or with a small 

 triangular projection at anteroproximal angle, surface with longitudinal 

 crests defined by grooves, grooves with series of short transverse 

 ridges; manus flattened, with similar crests and ridges; telson with 

 seven plates. 



Description: Carapace about as broad as long, lateral margins 

 rounded, frontal region strongly deflexed; surface roughened, plicate, 

 covered with fine punctae, and granular near margins; regions well 

 marked ; naked or with traces of hair on frontal region. Front strongly 

 projecting beyond eyes, rounded in dorsal view; faintly trilobate in 

 frontal view, lobes shallow, median lobe a little narrower than lateral 

 ones. Eyes visible in dorsal view. 



First and second movable segments of antenna granular, without 

 anterior projections ; third nearly smooth ; flagellum naked or with 

 vestigial hairs visible only under magnification. Outer maxillipeds punc- 

 tate or lightly rugose. 



Chelipeds covered with small, rough granules; devoid of hair. Merus 

 with a high ridge or low lobe on anterior margin. Carpus about one 

 and a half times as long as wide, anterior margin unarmed or with a 

 small triangular projection at anteroproximal angle; surface flattened, 

 uneven, with two or three low longitudinal crests and a fourth along 

 posterior margin, these crests defined by grooves sometimes containing 

 series of short transverse ridges. Manus flattened, with three crests on 

 dorsal surface and a fourth along outer margin, these crests defined 

 by broad grooves containing short transverse ridges as in carpus. Gape 

 of fingers devoid of pubescence. 



Walking legs slender, finely granular, with tufts of short plumose 

 and non-plumose hairs. 



Telson of abdomen with seven plates. 



Material examined: See Table 64. 



Measure/nents: Males, 3.1 to 6.3 mm; non-ovigerous females, 2.8 to 

 6.4 mm. The length of the non-ovigerous female holotype is 6.4 mm, its 

 width 6.8 mm. 



Color: In alcohol, carapace cream; ambulatory legs light pink; ab- 

 domen and sternum iridescent. (Glassell, 1936) 



Ecology: Alegalobrachium sfnithi commonly occurs in the intertidal 



