198 Bulletin, Vanderhilt Marine Museum, Vol. II 



near the outer angle as is also the inferior orbital margin, which is 

 beaded. 



The pterygostomian region is moderately convex. 



The eyestalk is cylindrical, finely punctate, the cornea spherical, 

 terminal. 



The antennulae have the basal joint greatly enlarged, flattish; 

 the next two articles long, slender, cylindrical, the flagella small, un- 

 equal. The antennulae fold transversely within the septum. 



The antennae have the fixed basal joint very small, squarish; the 

 next article similar but slightly smaller, the third joint only half as 

 large as the second, the flagellum consisting of about 20 tapering ar- 

 ticles, totaling a length about equal to the eyestalk. 



The external maxillipeds are moderately separated; the ischium 

 is rectangular, almost squarish, with a submedian longitudinal groove ; 

 the merus is not quite as long as the ischium but has its distal margin 

 oblique and its inner distal angle obliquely truncated, causing the 

 merus to appear five-sided. The palp has the basal joint much stockier 

 than the other two, which are successively tapering. The inner lat- 

 eral margin of merus and ischium are heavily fringed with stiff setae. 



The chelipeds are slightly unequal in the female ; the merus is short, 

 triquetral, with an acute spine about midway the outer lateral margin ; 

 the carpus is rounded, convex, with an acute spine on the inner angle ; 

 the palm is two-thirds as high as long in the smaller cheliped and four- 

 fifths as high as long in the larger cheliped with the outer face 

 slightly convex; the fingers are about as long, or a trifle longer than 

 the palm, slightly deflected, tapering, meeting throughout their 

 length; the cutting edge irregularly dentate; the tips curved. 



The ambulatories have the meral joint much the longest and widest 

 with a subdistal spinule on the anterolateral margin ; the carpus is 

 much narrower and one-third as long as the merus ; the propodus is 

 a third longer than the carpus and narrows distally ; the dactyl is as 

 long as the propodus and falcate. 



Synonymy. — Cancer angulatus Pennant, Brit. Zool., t. IV, p. 7, pi. 



V, fig. 10, 1777. 

 Ocyspoda angulata Bosc, Hist. Nat. des Crust., t. I, p. 198, 1802. 



Gonoplax angulata Leach, Edinb. Encycl., t. VII, p. 430, 1814. — 

 Milne Edwards and Bouvier, Exped. Sci. du Travailleur et du 

 Talisman, Crust. Decap., p. 106, 1900. — 0. Pesta, Die Decapoden 

 Fauna der Adria, p. 436, fig. 144, 1918 (and very full synonymy). 



