Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 43 



Type : The type material was ' ' found at St. Thomas, by Mr. Riise ; 

 at Key Biscayne, Florida, by G. Wurdemann, and at the Tortugas by 

 Dr. Whitehurst. " It is probably no longer extant. 



Distribution : Known from Beaufort, N. C, the west coast of Flor- 

 ida, the east coast of Mexico, Santa Cruz ; Porto Rico ; Bahamas ; the 

 Abrolhos Islands, Brazil. The only record of the megalops is from 

 Swan Island (Bingham, 1926). The ''Ara" specimen establishes the 

 first record of the species from the east coast of Florida, i.e., Knight's 

 Key and Florida Keys. 



Material examined: One small, ovigerous female from Knight's 

 Key, Florida, one large ovigerous female from the Florida Keys, tag 

 492, 1924; one small, sponge-clad male from tag 314, Turtle Harbor, 

 Fla., Nov., 1924, collected by the "Ara," William K. Vanderbilt, 

 commanding. 



Technical description : Carapace decidedly convex in both direc- 

 tions, longer than wide, 31 mm. long in median line ; 28 mm. maximum 

 width, across the anterolateral angle. The anterior region is much the 

 wider, the anterolateral margins broadly rounded, the lateral margins 

 slightly convergent posteriorly; the posterior margin relatively 

 straight. The interorbital space is narrow, the frontal margin is pro- 

 duced to a triangular apex which is bent downward at the median 

 point below and between the more prominent teeth of the inner 

 orbital angles. Running obliquely inward from the anterolateral 

 angles across the pterygostomian regian to the external distal angle 

 of the maxilliped is a row of four small, well-spaced tubercles, each of 

 which is but little more than a large granule. On the upper surface 

 of the carapace there is a deep longitudinal sinus on each side of the 

 cardiac region between it and the branchial lobes; there is also an 

 obscure, transverse groove running across the branchial lobe and ter- 

 minating at a small blunt tooth on the lateral margin. The female 

 abdomen in the egg-laden specimen is very prominent dorsally, sub- 

 oval, convex; it consists of seven segments, which form a broad belt. 

 The male belt is narrow, with a triangulate tip. 



The chelipeds are equal, stocky ; the merus trigonal in cross section, 

 closely appressed to the body, its distal end barely visible dorsally; 

 the carpus two-thirds as long as the merus with its upper surface 

 rounded, the palm is short and broad, convex on its outer surface, its 

 height almost equal to its width; the fingers are pearly white, very 

 stocky, with a slight basal gape; the upper finger is very curved, its 



