Boone, Crustacea, Cruise of "Alva," 1931 57 



Charyhdis (Goniosoma) cruciata Chen, Hong Kong Nat., Ill, March, 



1932, p. 38, text fig. 6, pi. 8.— McNeill, Records Austral. Mus. 



Sydney, vol. 17, p. 149, pi. 37, fig. 5, 1929. 

 Charybdis (Goniosoma) crucifera Nobili, G., Bull. Mus. Torino, vol. 



18, art. 453, p. 31, 1903. 

 Charyhdis cruciferus Stebbing, Ann. S. Afric. Mus., vol. VI, pt. 4, 



p. 306, 1910. 



Charybdis erythrodactyla (Lamarck). 



Plates 18 and 19. 



Type: Lamarck's type is deposited in the Paris Museum. It came 

 from Australasia. 



Distribution: Indian Ocean, (Lamarck; A. M. Edwards); Ha- 

 waiian Islands, (Randall); Hawaii: Puaho Bay; Honolulu, market; 

 Waiawa, Kauai; Salomon Island, Amirante, (Rathbun) ; Red Sea, 

 (Nobili); Sudanese Red Sea, station 7, (Laurie). Tahiti, (Boone). 



Material examined : One large male, Venus Point Reef, Tahiti, 

 Society Islands, August 15, 1931, collected by the "Alva." 



Color : See Rathbun, 1903, color plate. 



Technical description : Carapace slightly more than two-thirds 

 as long as wide, with the frontal margin equal to about one-half of 

 the maximum width of the carapace and cut into six strong, blunt, 

 triangular teeth, which are well separated by wide, U-shaped sinuses. 

 The innermost, or submedian pair of teeth are slightly longer and 

 protrude a little farther forward than the next, or intermedian pair, 

 and the median sinus is also slightly wider than the intermediate pair 

 of sinuses. In each of the latter there is present a small blunt, rudi- 

 mentary tooth adjacent to the base of the large intermediate tooth 

 and only about one-fourth of its height. The third, or outer, pair 

 of frontal teeth are distinctly the largest of the series, extending 

 farther forward than any of the others and set apart on either side 

 by a wider sinus, that between the third tooth and the inner orbital 

 tooth being slightly the wider. The superior inner orbital tooth is 

 strong, blunt, and does not extend as far forward as either the third 

 frontal tooth, or the conspicuous, inferior inner orbital tooth. The 

 superior orbital margin is thickened and is cut by two distinct, closed 

 sinuses on the outer half and a third closed sinus occurs on the lower 

 margin just beyond the strong outer orbital tooth. This outer orbital 

 tooth is a strong, procurved triangle with thickened edges and with a 

 small, secondary triangular tooth at its base. 



