136 Bulletin Vanderhilt Marine Museum, Vol. V 



(Miers) ; New Caledonia; Madagascar, (A. M. Edwards); Zanzibar, 

 (Hilgendorf). 



Material examined : One male, taken on the reefs of Falcon Island, 

 Palm Island, Queensland, Australia, October 7, 1931. One female 

 from the same locality. 



Technical description : The carapace is hexagonal, depressed, with 

 the frontal border equal to more than half the greatest width of the 

 carapace ; frontal margin nearly straight, faintly bevelled, with a very 

 faint median emargination, and set apart by a groove from the median 

 orbital angle. The orbital border is so circumscribed by a groove and 

 incised by two closed suture lines ; a third suture occurs on the inferior 

 margin just below the outer angle ; the surface of the carapace is gla- 

 brous ; the gastric region is defined by a light groove and subdivided by 

 light gastric grooves into three to five areolations; near the antero- 

 lateral margin the surface of the carapace is transversely wrinkled with 

 two wrinkles on each side, terminating outwardly beneath the lateral 

 teeth; there are four distinct, blunted teeth on the anterolateral 

 margin, in addition to the orbital tooth; the first tooth is small and 

 separated from the orbital tooth by a short wrinkle or groove ; the sec- 

 ond and third teeth are the largest of the series and are separated by 

 the two large, transverse wrinkles ; the fourth tooth is the smallest of 

 the series and is set apart by a very brief groove. The postlateral 

 margins are sloping, short, convergent; the posterior margin is 

 about as wide as the frontal margin and is emphasized by a flat 

 carina and there is a faint transverse groove not far above this carina. 

 The sidewalls of the carapace are smooth except for a faint groove 

 outlining the orbital border and another between the first and second 

 anterolateral teeth. The female abdomen is seven-segmented, wide oval 

 with its margins heavily fringed with setae; it covers almost the en- 

 tire sternal plastron. The male belt is narrow, consisting of five seg- 

 ments, the third to fifth segments being fused. 



The eye has a short stalk and an unusually large, bulbous cornea. 



The antennulae fold transversely within the fossett and are sepa- 

 rated from each other by a short wide bar. 



The antennae have the basal article large, subrectangular, extend- 

 ing into the orbital fissure, touching the deflexed frontal border on the 

 inner distal angle and the orbital margin on the outer. The flagellum 

 is small and slender, extending about three-fifths of the long diameter 

 of the border. 



