DECAPODS 



109 



the second joint ; second joint about one and a half times as long as the 

 third ; inner flagellum about one fourth longer than the carapace ; outer 

 flagellum about two thirds the length of the inner 

 and becoming much smaller at the middle, the distal 

 half very slender. 



Antennae with a strong spine below the base of 

 the acicle; peduncle slightly exceeding that of the 

 antenna; scale with a broad terminal spine, which 

 reaches the end of the antennular peduncle, and ex- 

 ceeds the blade, from which it is separated by a short 

 narrow slit ; flagellum nearly twice the length of the 



-tf j t ft t .^ FlG - 49- Betaus har- 



carapace. Maxillipeds reaching a little past the mid- rimani. a. Dorsal view 



,,,. . . ,. iif anterior portion (X 4). 



die of the terminal segment of the antennal peduncle, b. Carpus and chela of sec- 



i. , t_ .... - , . ond pair (x 5?)- c. Left 



Chelipeds subequal, similar, of very moderate size ; chela of first pair (x *|). 

 merus with rounded angles, the distal end widened, length about two and 

 a half times breadth, outer surface with a broad oblique sulcus, a trans- 

 verse groove at the supero-distal angle, behind which the upper margin 

 ends abruptly, but does not terminate in a spine; surface granulate, 

 lower surface granulo-spinulous. Carpus small, rounded. Hand narrow- 

 oblong, somewhat compressed, finely scabrous, margins rounded, the 

 length not more than one half greater than that of the preceding joints 

 combined. Fingers fitting close together, the pollex narrowly conical 

 and twice as wide at base as the dactylus, which is subcylindrical ; the 

 tips are sharp and cross each other ; the prehensile edges are subentire, 

 very finely denticulate, that of the pollex convex except at the tip. 



The first joint of the carpus of the second pair of feet is about as long 

 as the three following combined; the third and fourth are equal, the 

 second a little longer than either; the fifth twice as long as the fourth, 

 and slightly shorter than the palm, which is subequal to the fingers. 



The propodi of the remaining feet have a row of six or seven spines 

 beneath ; the dactyli are over a third the length of the propodi and very 

 acuminate. 



The postero-lateral angles of the fourth and fifth abdominal segments 

 are rounded, of the sixth blunt. The distal end of the peduncle of the 

 uropods bears a pair of spines; a spine near the outer angle of the 

 uropods. 



Color. Light green. 



Dimensions. Female, length of body to tip of telson 26.6 mm.; 

 length of carapace 10 mm. ; length of cheliped 17.5 mm. ; length of palm 

 6 mm. ; of dactyl 4.6 mm. 



Type locality. Sitka (W. R. Coe, Harriman Expedition); one female 



