264 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Diagnosis. — Surface vermiculatod ; vermiculations rough; furrows 

 between them narrow; punctae numerous; mesogastric punctae 

 median and lateral ; 5 L convex. 



Description. — Carapace flattened in its posterior three-fourths 

 and transversely so in its middle two-thirds. Frontal and antero- 

 lateral regions rolling convexly downward. The whole upper and 

 lower surface of body and feet, exposed when the chelipeds and legs 

 are flexed, has a deeply eroded or vermiculated appearance, being 

 filled with small cavities which make a regular pattern. The elevated 

 portions between the cavities are formed by masses of small granules 

 crowded close together. This produces a very rough surface in the 

 young and half grown; in the old the surfacb has worn off until it is 

 more or less smooth and the granulation is evident only -svith a lens 

 and is indicated largely by small punctae between granules. Margins 

 of cavities fringed with short pubescence. Carapace areolated, but 

 the divisions are to a large extent rendered indistinct by the character 

 of the surface. Lateral boundaries of gastric region deep; also the 

 median suture from the frontal margin to the mesogastric region. A 

 transverse suture runs a little behind each orbit, between the marginal 

 teeth E and N and forms the anterior boundary of the outer of the 

 two protogastric areoles. Another transverse suture extends from 

 near the median line in front of the cardiac region outward to the 

 base of marginal tooth S. A suture across the carapace behind cardiac 

 region is partly interrupted at middle by a small, transverse nodule. 

 From the gastric region a curved suture concave forward, separates 

 2 L, 3 L, N from 5 L, 4 L, T. Front steeply inclined; median lobes 

 evenly rounded, separated by a V notch from each other and by a 

 broad oblique rounded sinus from the small, conical, blunt outer 

 lobes. Outer angle of orbit neither dentiform nor projecting. The 

 first of the four antero-lateral teeth (E of Dana) is prominent, a little 

 below the orbital level, the inner and inferior slope of its acute edge 

 is directed toward the angle of the buccal cavity. Lobes N and T 

 are successively longer than E; above T is a shallow blunt point on 

 the lobe 4 L. S is dentiform, subacute and set off from the rest of 

 the margin. 



On the ischium of the outer maxilliped is an obhquely longitudinal 

 erosion pointed at both ends and extending nearly the whole length of 

 the article; a second, parallel suture on the outer distal half forms part 

 of an erosion which involves the adjacent carapace. A notch on 

 anterior margin of merus. 



Hands short and broad, upper surface divided by furrows into trans- 

 verse tuberculate ridges, outer surface divided into longitudinal ridges 

 the tubercles of which are smaller and better defined. Fingers short, 

 deeply grooved, 4-5-toothed within, dactyls tuberculate at base on 

 the upper side. Ambulatory legs with hairy edges, dactyli pubescent. 



