1921 ] Schmitt: The Marine Decapod Crustacea of California 95 



I. Group with gastric region not depressed below the general level of the carapace. 

 Antenna! scale with spine exceeding blade — (Continued) 



Section b. Carapace with two median spines. (For section a, see p. 84.) 



Crago communis (Rathbun) 



Crangon communis Eathbun, The Fur Seals and Fur-Seal Islands of the 

 North Pacific Ocean, pt. 3, p. 556, 1899; H. A. E., 10, 123, fig. 64, 1904. 



Fig. 63. Crago communis, $; a, dorsal view of anterior portion, natural size; 

 b, lateral view, natural size; c, acicle, X 2; d, lateral view of anterior portion of 

 carapace; e, dorsal view of same, X 2; /, chela, X 2% (last four from Rathbun, 

 U. S. N. M.). 



Characters. — Third to fifth abdominal segments with a blunt median carina; 

 first and second segments with a transverse sulcus; the third and fourth each 

 with two transverse sulci, which are connected either side of the median carina; 

 sixth segment furnished with two prominent longitudinal carinae, a median sulcus, 

 and a sulcus on the outer side of each carina; the telson with a deep median 

 sulcus. The abdominal sulci are filled with a short, thin pubescence, easily rubbed 

 off. Second segment of antennular peduncle about twice as long as the third. 

 Rostrum slender, tapering, ascending, having a median sulcus, tip rounded, 

 not extending beyond the eyes. Hands over three times as long as their average 

 width, anterior margin obliquely transverse. Antennal scale about two-thirds 

 the length of the carapace; spine exceeding blade. 



Dimensions. — Type, female: length 64 mm., length of carapace 16 mm., length 

 of antennal scale 10.5 mm. The Survey specimens ranged between 33 and 65 mm. 

 in length; the average of the twenty -five specimens taken being about 40 mm. 



