Boone, Crustacea, Cruise of "Alva," 1931 61 



Cape Jaubert, N. "W. Australia, 70 ft., (Rathbim) ; L'ile de France, 

 (H. M. Edwards) ; Seychelles, (Miers) ; Cargados Caragos, (Rathbun) ; 

 Mauritius, (Miers ; Ortmann; Richters; Alcock) ; Reunion, (Hoff- 

 man) ; common on the coasts of New Caledonia, (A. M. Edwards) ; 

 Dar-es-Salaam, Upanga-Riff, Nosse-Be, Madagascar, (Richters). 



Material examined: One male on coral reef, Nuka Hiva Island, 

 Marquesas Islands, August 10, 1931. 



Technical description: Carapace about three-fourths as long as 

 broad, depressed, with the surface granulose and finely setigerous. 

 The regions are well separated by deep grooves which cut the surface 

 into a number of well defined moderately convex areolations. The 

 frontal margin is about one-third as wide as the carapace, well de- 

 lineated, a little receding and protruding beyond the blunt inner supe- 

 rior orbital angles ; it is cut into four teeth, the inner or submedian pair 

 of which are quite small, separated from each other, by a deflected 

 median point and from the larger, outer pair of teeth by a shallow 

 sinus; the outer pair of teeth are unequally, widely triangular, pro- 

 truding and set apart by a V-shaped sulcus from the blunt inner 

 orbital angle. The orbital margin is circumscribed and is cut by two 

 closed sinuses ; the outer orbital angle is an uptilted triangulate tooth. 

 The inferior orbital margin is visible dorsally and has one distinct 

 suture near the base of the outer tooth; the inferior inner orbital 

 angle is an uptilted blunt triangular tooth, more conspicuous than, 

 and in advance of, the superior inner orbital angle. The anterolateral 

 margin is slightly oblique and is cut into nine acute, procurved teeth, 

 including the outer orbital tooth, the hindermost tooth being similar 

 to and only a trifle stronger than the others. There is a thick fringe 

 of setae in the spaces between the orbital teeth. The postlateral mar- 

 gins are shorter than the anterolateral, and are slightly excavate, 

 forming a continuous curve with the short posterior margin. The 

 cardiac region is completely circumscribed. The cervical groove runs 

 forward around the gastric region and diverges, uniting with a decid- 

 edly curved groove that runs inward from the ninth postlateral tooth, 

 delimiting the anterolateral border from the branchial region. The 

 intestinal region is divided by grooves into a median and two sub- 

 median lobules. The sidewalls of the carapace and sternal plastron 

 are smooth. The buccal cavern is squarish, wider than long; the 

 efferent branchial channels are well defined. The male abdominal belt 

 is composed of six articles; the third article having a strong sharp 

 carina along its entire width; the fourth and fifth articles are fused 



