REPORT ON THE BRACHYURA 283 



three in number, besides the postorbital. The tooth corre- 

 sponding to the first one of the male is obsolete: the next two 

 are large and less divergent from the carapace than in the 

 male. The last tooth is larger in the female than in the male. 

 The inequality in the chelipeds is less in the female than in 

 the male. 



2'oung. — The young of this or of a closely allied species was 

 taken at station 2402, '-Albatross," south of Cape San Bias, 

 in fathoms, and by the University Expedition off Sand Key. 

 In these young specimens, only two lateral teeth are evident 

 on the carapace; they are sharp and subequal. There is a 

 denticulated elevation on the merus in place of the single 

 spine of the adult. 



Dimensions. — Male, length 7.6, width 10.5, width of front 

 4.1 mm. Female, station 2401. length 8.1, width 10.2; sta- 

 tion 2400, length 6.1, width 7.S mm. 



IO3. PlLUMNOPLAX AMERICAXUS Sp. nOV. PI. VII. FigS. I 



and 2. 

 Station 28, off Sand Key, 116 fathoms; stations 51, 52, 62, 

 off American Shoal, 70 to no fathoms; station 56, Pour- 

 tales Plateau, lat. 24" 16' X., long. 81" 22' W., about 

 200 fathoms. 



Surface granulate^ P) lateral teeth jive; front silicate. 



Carapace finely granulate under the lens; gastro-cardiac 

 sulcus distinct; anterior mesogastric region faintly outlined. 

 Front abruptly defiexed; upper margin with a slight median 

 emargination, from which the two truncate lobes incline 

 slightly backward; surface of front transversely sulcate; 

 lower margin projecting a little beyond the upper, emarginate. 

 Front deepest just outside the median emargination; margins 

 granulate. Superior margin of orbit with a deep and narrow 

 notch near the middle, and a deep rounded sinus near the 

 outer angle. The outer orbital tooth is prominent and blunt, 

 and is coalesced by a shallow sinus with the first broad lobi- 

 form tooth of the lateral margin. In addition there are three 

 lateral teeth, of which the first two are acute, the first espe- 



