DECAPODS 169 



Carapace subcircular, a little broader than long; dorsally flat, finely 

 granulate, the granules larger toward the outer margin; gastric and 

 cardiac-intestinal regions bounded by deep grooves. The front is occu- 

 pied by two triangular lobes, each tipped with a blunt tooth, and sepa- 

 rated from each other by a broad V-shaped sinus, which is prolonged on 

 the dorsal surface by a broad, shallow depression continued to the gastric 

 region ; outer margin of each lobe slightly concave. Outer orbital tooth 

 narrow, blunt, well marked. A little in front of the middle of the lateral 

 margin is a tooth somewhat larger than the orbital, and directed forward 

 and slightly outward. At one third the distance from the orbital to this 

 branchial tooth is a much smaller triangular tooth directed outward. 

 The antennulse are hidden under the carapace. The basal segment of 

 the antennae is moderately enlarged. The anterior end of the buccal 

 cavern and of the merus of the outer maxillipeds project slightly in front 

 of the median sinus of the front. 



Chelipeds equal, rather short, stout, coarsely scabrous-granulate. Merus 

 stout, unarmed. Carpus broader than long, having a shallow, plate-like 

 blunt tooth along its outer surface, a short blunt tooth at inner angle. 

 The palm is about as broad as long, bears a stout blunt spine or tooth 

 on the outer side at the articulation of the carpus, and a lower, less 

 conspicuous tooth at the articulation of the fingers ; two feebly marked 

 carinae, one connecting the two teeth, the other lower down. The digits 

 are longer than the upper margin of the palm, bent down, not gaping, 

 the pollex much stouter than the dactylus, edges denticulate ; the pollex 

 has a superior longitudinal groove ; its inner superior margin is subacute 

 and continuous with that of the palm. Second pair of feet about twice 

 as long as the carapace, dactylus longer than propodus. Third pair 

 exceeding the second by half the length of the dactylus. Last two pairs 

 of feet missing. 



Color. Carapace speckled with small black spots, in alcohol. 



Dimensions. Length of carapace of male, to end of horns, 3.4 mm., 

 width 3.7 mm. Length of female 2.8 mm., width 3 mm. 



Type locality. Southern California, either at Catalina Harbor or 

 Monterey (probably the former) ; W. H. Ball ; i $ , i ? (Cat. No. 

 14,256). 



Additional specimen. A female corresponding to the above was 

 dredged in 1863 at Catalina Island by Dr. J. G. Cooper. With it is a 

 male (Plate ix, fig. 5) a little larger and as long as wide (4.3 mm. 

 long to end of horns and 4.2 mm. wide), which differs notably in the 

 following particulars: The frontal lobes are prolonged in cylindrical 

 blunt spines; the upper orbital margin has an inner rectangular sinus, 



