Boone, Crustacea, Cruise of "Alva," 1931 105 



a trilobed lobule and just anterior to it is the shield-shaped cardiac 

 lobe, which has the anterior median area produced into a slender 

 process that extends between the median lobes of the gastric region. 

 On each side of the cardiac lobe there is a small lobe and outside and 

 adjacent to this a much larger very convex lobe on the summit of the 

 branchial region. On each side of the anterior point of the cardiac lobe 

 there are four suboval convex lobes in transverse series across the 

 gastric and branchial regions. There is a total of thirty lobules on the 

 carapace, counting the small ones of the marginal areas. The male 

 belt is triangular, composed of five articles, the third to fifth segments 

 being fused. Both the sternal plastron and the belt have their surfaces 

 much sculptured by deep irregular pittings between the elevated small 

 lobes. The epistome is carinate and the adjacent side regions are paved 

 with close-set rounded granules which also occur abundantly on the 

 outer face of the external maxillipeds. 



The eye is small, the cornea being restricted to the very tip of the 

 stalk and with a portion of its dorsal surface covered by a calcareous 

 process. 



The antennulae are large with a rudimentary flagellum, semicon- 

 cealed in a large tuft of setae ; they fold transversely within the f ossett ; 

 the interantennulary septum is wide with a median sulcus on its outer 

 face. 



The antennae have the basal article greatly enlarged, filling the 

 space between the deflected frontal border and the inferior orbital 

 angle, with the distal end of the article produced and lying within the 

 orbital sinus; the second and third peduncular articles are greatly 

 reduced, as is also the threadlike ten- jointed flagellum which is less 

 than one-third the long diameter of the orbit. 



The external maxillipeds are squarish, close fitting, with the outer 

 surface covered with coarse rounded granules and numerous bristles, 

 especially along the inner lateral and distal margins. There is a deep 

 median longitudinal sulcus on the outer face of the subrectangular 

 ischium and a similar sulcus which widens distally on the face of the 

 merus. The merus has its outer distal angle somewhat produced in a 

 rounded process and the distal margin is slightly sinuate. The palp 

 is very stocky and setose. 



The chelipeds are equal in the male, and are stocky and closely ap- 

 pressed to the sides of the carapace. The merus is short and does not 

 extend beyond the margin of the carapace ; the carpus is large, lobulate, 



