Boone, Crustacea, Cruise of "Alva,'* 1931 149 



Vivonne Bay, Kangaroo Island, South Australia, (Hale) ; Apia, 

 Samoa, (Boone). 



Material examined : One large male, taken at Apia, Samoa, Sep- 

 tember 5, 1931, by the "Alva." 



Technical description: Carapace about three-fourths as long as 

 wide, with the frontal margin equal to about one-third of the total 

 width, the anterolateral margins very short, the postlateral margins 

 decidedly convergent. The frontal margin is thick, sinuate, weakly 

 four-lobed, the submedian pair of lobes being much the wider, the 

 outer pair small, separated by a small concavity from the blunted pre- 

 orbital angle ; a small sinuate sulcus occurs faintly behind the frontal 

 margin. The orbital margin is thickened, without sinuses. The 

 anterolateral margin is short, cut into four teeth, the first of which is 

 wide, blunt, and confluent with the postorbital tooth ; the second tooth is 

 also wide and blunt; the third and fourth teeth are more angulated 

 and elevated ; this lateral region is decidedly rugose, pitted. The post- 

 lateral margins are long and decidedly convergent. The dorsal sur- 

 face is flattish with the small, paired frontal areolates gently de- 

 fined; the gastric region is circumscribed by a distinct groove; the 

 mesogastric lobes being prominent anteriorly, obsolete posteriorly; 

 there is a distinct, shallow sulcus curving inward from between the 

 second and third anterolateral teeth in an arc which has the inner 

 end united with the cervical groove and confluent with the small 

 sulcus that borders the anterior lobes. Running inward from the base 

 of the fourth anterolateral tooth is a deeper, curved sulcus uniting 

 with the posterior curve of the cervical groove. This posterior sulcus 

 is an arc with the ends directed anteriorly, while the anterior arc has 

 the ends directed backward. The pterygostomian region is granulose. 



The chelipeds are distinctly unequal in both sexes, as shown in the 

 plate; the carpus is convex with a decided transverse sulcus on the 

 upper surface. The palm is moderately convex ; the fingers are black, 

 curved and pointed ; those of the great chela have a wide gape ; each 

 finger is armed with a large sub-basal molar and two or three rudi- 

 mentary teeth, finger tips meeting. The fingers of the smaller chela 

 have but little gape and each has several rudimentary teeth. The 

 lower fingers have each a longitudinal groove on the outer face. 



The ambulatories are slender, subcylindrical, granulose, hirsute; 

 the dactyl velvety-pilose, firm-tipped. 

 The eye is small, typically Ozius. 



