128 Bulletin Vanderhilt Marine Museum, Vol. V 



Actaea cavipes (Dana), 

 Plate 68. 



Type: The type material was collected in the Feejee Islands and 

 the Samoan Islands and is deposited in the National Museum at Wash- 

 ington (these probably no longer extent), and in the Philadelphia 

 Academy of Natural Sciences. 



Distribution: Upolu, Samoa, Feejee Islands, (Dana) ; Pago Pago, 

 Samoa, (Boone) ; Upolu, Samoa, (Alcock) ; Society Islands, (Boone) ; 

 Paumotu Islands, Ellice Islands, Society Islands, several records, 

 (Rathbun) ; Rikitea, Mangareva, Taku, (Nobili) ; Palmyra Island, 

 (Edmondson) ; LiuKiu Islands, Kagoshima, Amami Oshima, Japan, 

 Chokirbank, in coral, (Ortmann) ; Andamans, Mekran coast, India, 

 Persian Gulf, (Alcock) ; Dar-es-Salaam, (Ortmann) ; rare at New 

 Caledonia, (A. M. Edwards) ; Mauritius, (Alcock) ; Port Louis and 

 Chaland, Mauritius, (Bouvier) ; Seychelles, Salomon, lagoon, Eg- 

 mont, reef, Amirante, 30 fms., (Rathbun) ; Dirk Hartog Island, West 

 Australia, (Hale). 



Material examined : One male, taken at Pago Pago, Samoa, Sept. 

 2, 1931, by the "Alva," Three males, taken on Venus Point Reef, 

 Tahiti, Society Islands, August 15, 1931. Another smaller male, from 

 Venus Point Reef, Tahiti, Society Islands, August 15, 1931. 



Technical description: Carapace with the anterior three-fifths 

 widely rounded, oval, the postlateral margins short and decidedly con- 

 vergent; the posterior margin short, straight; the greatest median 

 width is one and one-half times the length ; the frontal margin is little 

 more than one-third the total width and is deflected, composed of two 

 wide beaded laminate lobes, separated by a median sulcus, with the 

 outer angle nearly right-angled and set apart from the tumid superior 

 orbital border by a small notch ; viewed ventrally the margin of each 

 frontal lobe is slightly sinuate, viewed dorsally the contour of the 

 frontal border appears to be a trifle in advance of the anterolateral 

 margin and the inferior orbital margin visible. The orbit is sub- 

 circular with the inner half thickened, granulose, cut by two closed 

 sutures, the inferior margin similarly thickened, the outer angle 

 obsolete but set apart by a sulcus from the first anterolateral tooth. 

 The anterolateral margin is much longer than the postlateral and is 

 widely rounded and cut into four teeth, the first and second of which 

 are wide and blunt, the third and fourth being more acuminate; the 

 margins and apices being emphasized by clusters of rounded, large, 



