Boone, Crustacea, Cruise of "Alva," 1931 141 



well) ; Mauritius, (Alcock; Pesta) ; in coral, Port Louis, Grand Port, 

 Chaland, Mauritius, (Bouvier) ; in coral, New Caledonia, (A. M. 

 Edwards) ; Seychelles : Salomon, Egmont, reef, Diego Garcia, lagoon, 

 10 fms., 12 fms., Cargados Carajos, reef, (Rathbun) ; Australasia, 

 (H. M. Edwards) ; tidal zone, Zanzibar, Bawi, East Africa, (Lenz) ; 

 rare in rock crannies at Natal Point, South Africa, (Stebbing.). 



Material examined : One male, taken at Pango Pango, American 

 Samoa, Sept. 2, 1931, Nine smaller adults, including two ovigerous 

 females, taken in coral at Teviatoa reef, Raiatea Island, Society 

 Islands, August 21, 1931. One smaller female, Venus Point, Reef, 

 Tahiti, Society Islands, August 15, 1931. 



Technical description : Carapace 14 mm. wide, 8 mm. long, hex- 

 agonal, with the regions and their subdivisions sharply defined by 

 distinct grooves; the elevations or lobules are all convex, with a 

 finely granulated surface. The interorbital space is about one-third 

 the width of the carapace, with the frontal border bilobed and slightly 

 bowed, the outer angle of each lobe forming a distinct little lobule. 

 The orbital region is circumscribed, the immediate orbital margin is 

 lined with three closed sinuses, two of which are on the outer half 

 of the upper margin, and the third is at the extreme outer angle. 

 The anterolateral margin is convex and is divided into four well 

 separated, sharply conical teeth, the third and fourth of which are 

 longer, procurved and more acute. There are three denticle-like, con- 

 ical small lobules, one each, behind the second, third, and fourth teeth. 

 The postlateral margins are quite as long as the anterolateral margins 

 and are sharply convergent. The sculpturing of the carapace, as 

 shown in plate 73, consists of two lobules on the mesogastric region; 

 behind these four separated lobules in transverse series; the cardiac 

 region circumscribed, with a separate transverse elevation immediately 

 posterior to the urogastric lobe, and behind this a separated, trans- 

 verse elevation on the posterior region of the carapace. Behind the 

 four lateral teeth are the three above-mentioned conical elevations, and 

 behind these are three more conspicuous lobules, the anterior of which 

 is in line with the series of four metagastric lobules, while the other 

 two fill in the remaining anterior branchial space; behind this series 

 are two more lobules on the branchial region, the inner one being 

 adjacent to the cardiac region. The sidewalls of the carapace are 

 quite granular. 



The antennulae are well separated by the median septum, and fold 

 almost transversely. 



