XiPHOCEPHALUS WhiTEI. 125 



2. Xiphoceplialus Whitei, Spence Bate. 1862. 



Tlic name \va.s given by 8i>exce Bate in honmir ol" Mr. Aha.m White 



PI. YII, 1—20; and p. 24, fig. 13-17; p. 26, fig. 24; p. 28 fig. 32; p. 2'J, fig. 45; p. 



30, fig. 46 and 47; p. 31, fig. 48 and 49; p. 35, fig. 63 and 64; ]^. 40, fig. 78, 



79, 81, and 82; p. 42, fig. 83 and 85; p. 43, tig. 86; and p. 129, fig. 87. 



Diagn. The head^ without the rostrum, i.s as long as the first six 

 pera^oiial segments together. Tlie neck is a little longer 

 than the ocular region. The rostrum is shorter than the 

 perîEon and pleon together. 



The tlagellum of the first pair of antennce in the male is two- 

 jointed. 



The seventh perœonal segment is not half as long as the sixth; 

 is crescent-sliaped, sharp-pointed, and produced downwards. 



The epimeral of the first pair of perceopoda is obtusel}^ crescent- 

 shaped, and projects forwards. The carpal process of the 

 first pair is smooth, without tooth on the hind margin; the 

 lower hind corner of the metacarpus is sharp-pointed. The 

 femur of the fifth and sixth pairs is narrow, not dilated. 



The pleon is dorsally carinated. 



The first ural segment is as long as, or longer than, the last 

 coalesced segment. 



The first pair of uropoda are about as long as the third; the 

 second pair are longer than, the last coalesced ural segment, 

 but shorter than the third pair. The outer ramus of all the 

 three pairs is more than half as long as the inner. 



The lelson is a little longer than the last pair of uropoda, 

 and is shorter than the urus. 



Colour. Yellowish white. 



Length. 35 — 75 mm. 



Hab. The Southern tropical and subtropical regions of the At- 



lantic; the Indiau Ocean; the tropical regions of the 

 Pacific. 



