128 Bulletin, Vanderhilt Marine Museum, Vol. II 



thickened ridge, with only the indication of a median sulcus in the 

 frontal margin and at the preorbital angle; on the outer half of the 

 superior orbital margin there is a very faint unevenness, indicating 

 two entirely closed sinuses. The inferior orbital tooth is well devel- 

 oped. The anterolateral margin is wide, convex, cut into four teeth, 

 in addition to the preorbital tooth, which is bluntly truncated and 

 almost entirely fused with the second tooth; the third, fourth and 

 fifth teeth are more sharply defined with acuminate tips and slightly 

 decreasing in size posteriorly; the postlateral margins are decidedly 

 convergent; the posterior margin straight, slightly thickened. There 

 is a distinct pit on either side of the cardiac region and the cervical 

 groove is well delineated. The dorsal surface of the carapace is mod- 

 erately convex longitudinally and covered with a dense fur-like pil- 

 osity, except for a narrow bare space on the extreme anterior region, 

 paralleling the frontal and orbital margins. The postlateral walls of 

 the carapace are very high, oblique. 



The eyestalk is stocky, constricted below the cornea and produced 

 into a tongue-like projection tipped with a double tubercle on the 

 upper surface of the cornea and another on the frontal border; the 

 cornea is large, spherical, terminal, shining black. 



The antennulae have the basal article much enlarged, the second 

 and third articles subequal, clavate, the biarticulate flagellum with 

 one large and one smaller branch. The free articles fold transversely 

 within the fossett, which is divided medially. 



The antennae have the basal article small, stocky, lodged between 

 the antennular base and the preorbital angle and not reaching to the 

 superior frontal border; the second articles lies in the orbital sinus 

 and barely touches the frontal margin; the third article is slightly 

 smaller than the second, and the flagellum consists of about 22 rings 

 and is slightly longer than the long diameter of the orbit. 



The external maxilliped has the exognath extending to the tip of 

 the merus ; the ischium is rectangular, twice as long as wide, with the 

 distal margin excavate; the merus is squarish, with the outer distal 

 angle acute-angled and slightly produced; the inner angle is slightly 

 obliquely truncated for the reception of the stocky three-jointed palp. 



The chelipeds are equal in the female, unequal in the older males. 

 The merus is short, closely appressed to the carapace; the carpus is 

 very long, convex on the upper surface; the palm is large, convex 

 on the outer face, about one-third larger than the carpus and three- 

 fourths as high as long, with the outer face convex; the upper and 



