Boone, Crustacea, Cruise of "Alva," 1931 107 



Euxanthus mamillatus A. Milne Edwards, Nouv. Archiv. Mus. Hist. 



Nat., Paris, t. I, p. 292, pi. 15, figs. 2-2b, 1865 ; ibid., t. IX, p. 196, 



1873. — Haswell, Catal. Australian Stalk- and Sessile-eyed Crust., 



p. 48, 1882. — DE Man, Journ. Linn. Soe. Zool., vol. 22, p. 30, 



1887-88. 

 Euxanthus nitidus Dana, Proe. Acad. Nat. Sci. Phila., vol. 6, p. 75, 



1852 ; U. S. Explor. Exped., vol. XIII, Crust, pt. I, p. 174, Atlas, 



pi. 8, figs. 9a-b (young), 1852. 

 Melissa nitida Strahl, Wiegmann's Archiv. fur Naturges., vol. 27, I, 



p. 103, 1861. 

 Cancer exscidptus Hoffman, in Pollen and Van Dam, Recherches 



Faune de Madagascar et de Dependances, Crust. Pt. V, p. 38, 



1877, Leide. 

 f Euxanthus exscidptus variety rugosus Miers, Zool. H. M. S. "Alert,'* 



pp. 517, 527, 1884. ( ? young, Alcock dixit.). 



Euxanthus sculptilis Dana. 



Plate 57. 



Type: Dana's type material was taken in the Feejee Archipelago 

 and Tongatabu. Present depository Smithsonian. 



Distribution : Feejee Islands, and Tongatabu, (Dana) ; Samoan 

 Islands, (Ortmann) ; Amboina, (de Man) ; Torres Straits, (Jac- 

 quinot) ; Queensland: Cape Grenville, (Haswell) ; Torres Straits, (A. 

 M. Edwards, Lucas) ; north and northeast Australia (Miers) ; north, 

 east and west Australia and the Moluccas, (de Man) ; Persian Gulf, 

 Andamans; Samoa, (Alcock); Tahiti, (Boone). 



Material examined: One female, Venus Point Reef, Tahiti, So- 

 ciety Island, August 15, 1931, collected by the "Alva." 



Color: Violaceous blue on the carapace and legs, with the fingers 

 black. 



Technical description: Carapace widely oval, width about one 

 and two-fifth times the length ; convex in both directions ; entire dorsal 

 surface covered by convex, granulose lobules which are composed of 

 rounded granules in berrylike formation. These lobules are separated 

 by wide sulci which are paved with rounded granules. The frontal 

 margin is one-third of the width of the body and appears to be slightly 

 in advance of the anterolateral margin and is deflected, being composed 

 of two wide lobes, separated by a slight median notch ; the inner half 

 of the margin of each lobe is convex, the outer half concave, except the 



