Boone, Crustacea, Cruise of ''Alva,*' 1931 111 



Haswell states "widely distributed," referring to this species in 

 Australia. Shark Bay, west Australia, (Miers) ; Port Curtis, 7 to 11 

 f ms. ; Port Molle, beach between tidemarks, Australia. Rockhampton, 

 Queensland; (Ortmann) ; Palm Islands, Queensland, (Boone) ; shore, 

 Cockburn Island, north Queensland, (Caiman) ; Pulo Satang, Borneo, 

 (Nobili) ; Praslin, Saya de Malha, Seychelles, (Rathbun) ; Mauritius: 

 Chaland, Grand Port, (Bouvier) ; New Caledonia, (Hilgendorf) ; 

 Madagascar, Zanzibar, (A. M. Edwards). 



Material examined: One large specimen, taken on coral reef, at 

 Falcon Island, Palm Islands, Queensland, Australia, October 7, 1931. 

 One young specimen taken in coral reef, at Anaho Bay, Nuka Hiva 

 Island, Marquesas Islands, August 10, 1931. 



Technical description: Carapace with frontal and anterolateral 

 margins forming a wide oval, the posterior lateral margin concave 

 and decidedly convergent; the anterior two-thirds is moderately con- 

 vex for this genus and areolated; the posterior third nearly flat and 

 not areolated. The frontal margin is narrow, about one-fourth of 

 the total carapace width, bilaminate, a median groove running back 

 onto the gastric region, the frontal margins of the lobes slightly con- 

 cave, the outer angle bluntly rounded, separated by a notch from the 

 inner orbital angle, which is less protuberant. The frontal margin pro- 

 jects somewhat beyond the orbital angle. The upper orbital margin 

 is not very swollen and is marked by two closed sutures on the outer 

 half and the lower margin has another just below the frontal margin. 

 The external orbital angle is blunt and is well separated from the 

 first tooth of the anterolateral margin; below the orbital angle is a 

 small prominent denticle. There are four acuminate teeth on the 

 anterolateral margin ; the first, second and third teeth increasing in 

 length and prominence in the order named, while the fourth tooth, 

 situated at the postlateral angle is most acuminate. The gastric and 

 cardiac regions are circumscribed. On the gastric region there are 

 a pair of fairly prominent submedian lobes posteriorly and on either 

 side of these, near the cervical groove there is a larger low lobe on each 

 side. On the outer anterior portions of the carapace there are five 

 low lobes on each side ; three of these follow the contour of the antero- 

 lateral margin, the outer two being behind these. The furrows be- 

 tween the lobules are wide and clear. The surface of carapace is 

 smooth, showing only fine punctae under the microscope. The side- 

 walls of the carapace have a dense brushlike coating of thick coarse 

 setae as have also the upper lateral margins of the proximal joints of 



