Boone, Crustacea, Cruise of "Alva,'' 1931 33 



and Sydney, Australia; Auckland, New Zealand, (Miers; Heller; 

 Pesta) ; New Zealand, (Filhol) ; Oahu, Hawaii, (Owen) ; Honolulu, 

 reef and market, (Ratlibun) ; Sandwich Islands, (Dana, Pesta, 

 Streets); Upolu, Samoa, (Pesta; Miers); Mauritius, (Ortmann, 

 Richters) ; Foquets, Mauritius, (Lenz and Richters) ; Grand Port, reef, 

 Mauritius, (Bouvier) ; Farquhar, atoll, lagoon, Seychelles, (Rath- 

 bun) ; New Caledonia, (A. M. Edwards) ; Nosse-Faly, Madagascar, 

 (Hoffman) ; Madagascar, (Heller) ; Nosse-Be, Madagascar, (Gravier) ; 

 Mozambique, beach, (Miers) ; East Africa, (Th. Monod) ; Zanzibar, 

 (Lenz; Hilgendorf; A. M. Edwards); Natal Bay, South Africa, 

 (Krauss) ; Durban Bay, collection, (Stebbing) ; Red Sea, (Heller; 

 Kossman; Martens; de Man; Nobili, Pesta); Payta Assab, (Cano) ; 

 Shadwin Island, Hanfela, Perim, Red Sea, (Balss) ; Stations 7 and 8, 

 Sudanese Red Sea, (Laurie). 



Material examined : Several small specimens, taken on coral reef, 

 Anaho Bay, Nuka Hiva, Marquesas Islands, August 10, 1931, by the 

 ''Alva." 



Technical description : Carapace decidedly convex, rough with 

 tubercles of varying sizes, with the fronto-lateral margin widely 

 rounded, crenulate, cut into 10 to 12 shallow, triangulate teeth; the 

 posterolateral angles produced into a winglike expansion, the anterior 

 margin of which is cut into four or five shallow triangulate teeth, 

 these increasing slightly in size from the anterior to posterior; on the 

 posterior border there are no true teeth but two well-separated inden- 

 tations of the margin occur. The entire margin of the winglike ex- 

 pansion is beaded by rounded granules, and a short crest formed of 

 similar beads runs inward from the apex of each of the seven teeth of 

 the expansion. The frontal margin is narrow, composed of two closely 

 placed, tilted teeth, which together form a triangular process, slightly 

 incised at the median point, from which a sulcus extends backward. 

 The orbital margin is small, beaded, subcircular, with two closed 

 sinuses on the outer half of the superior margin. The regions of the 

 carapace are poorly defined, except that the urocardiac region is 

 separated by a well defined, furrow-like, longitudinal depression on 

 each side. There are also a pair of pitlike depressions, one on either 

 side of the mesogastric region, just anterior to the large tubercle that 

 marks the summit of this region. The anterior three-fourths of the 

 carapace is roughened by many large and small granular tubercles. 

 There are three large, rounded tubercles in longitudinal series on the 

 median dorsal line, and approximately opposite these on the inner 



