DECAPODS 121 



feet reaching the end of the maxillipeds; hand 

 very long and narrow, the length from four to 

 four and a half times the width, longer in male 

 than in female, inflated near the base, outer margin 

 concave for the most part, inner convex, dactylus 

 when flexed almost longitudinal. 



A t- j i ^11 JJ/-/-1 ^ IG - ^i. Crangon francts- 



Abdommal segments smoothly rounded; fifth corum (x*\). a. Chela of $. 



. . . . . . , . . . San Francisco market, b. Chela 



with a spine on either side of the posterior ex- of 9 . station 2528. 

 tremity at the supero-lateral angles. Sixth segment as in C. nigricauda; 

 telson sharp. 



Dimensions. Length of male 77 mm., length of carapace 20.5 mm., 

 of antennal scale 1 5 mm. 



Distribution. I have examined specimens from 

 Thorn Arm, southeastern Alaska, in drag seine (Albatross). 

 Promise Island, southeastern Alaska (Albatross). 

 Loring, Revillagigedo Islands, southeastern Alaska (Albatross). 

 Strait of Fuca (D. S. Jordan). 

 Puget Sound (D. S. Jordan). 

 Mouth Tenmile Creek, 10 miles south of Florence, Oregon (S. E. Meek, 



U. S. Fish Commission). 



Off Tillamook Rock, Oregon, 29 fathoms (Albatross station 2883). 

 Off Yaquina Head, Oregon, 28 fathoms (Albatross station 3055). 

 San Francisco Bay (Albatross) : on South Belmont Oyster Beds, with 



seine; off San Mateo, 3 fathoms, with boat dredge; in San Pablo 



Bay, in Chinese shrimp nets; San Pablo Bay, 12 fathoms, station 



3097 ; and off San Bruno Point, in Chinese shrimp nets. 

 San Francisco Bay (various collectors). 

 San Francisco market (R. E. C. Stearns). 

 Pacific Grove, California (Stanford University). 

 San Diego, California (H. Hemphill). 



Previously known also from Shoalwater Bay, Washington, and To- 

 males Bay, California. 



This form is represented in deeper waters by a form which I have called 



CRANGON FRANCISCORUM ANGUSTIMANA Rathbun. 



Crangon franciscorum angustimana RATHBUN, Proc. U. S. Nat. Mus., xxiv, 

 889, 1902. 



Its chief difference lies in the shape of the hands, 

 which are narrower than in C. franciscorum, the differ- 

 ence being less in the female ; in the 



FIG. 62. Crangon fran- . f 



dscorum angustimana. male the length is about five and a 



Chela of i (X^y)- Station , 



3612. half times the width, the dactylus is 



more longitudinally placed, and the pollex is more trans- frandsclm 



verse and nearer the proximal end of the hand. a f * (X 2>< 



