1921 ] Schnvitt: The Marine Decapod Crustacea of California 219 



II. Anterolateral and posterolateral margins not meeting at a distinct angle; 

 carapace widest at seventh or eighth tooth; twelve or thirteen teeth. 

 Dark color on dactyls of chelipeds reaching more than half the length 

 of the outer margins, movable finger almost entirely dark colored. Merus 

 of outer maxillipeds with antero-external angle produced. 



oregonensis, p. 234. 



Key to the California Specimens of Cancer, 20 mm. and Less in Width 



I. Front markedly produced, formed of five subequal teeth, of which the median 

 is the most advanced ; anterolateral teeth never spiny-pointed ; carapace 

 never pubescent. Fingers of chelipeds with dark color. Color pattern of 

 carapace extremely variable, from more or less uniform color to promi- 

 nent longitudinal lines. 



productvbs, p. 220. 

 II. Front not markedly produced, formed of five unequal teeth, the outer teeth 

 larger and more widely separated from the three median teeth than these 

 from each other. 



A. Carapace widest at ninth or tenth anterolateral tooth. 



1. Carapace widest at tenth anterolateral tooth, which is always the 



last; posterolateral margin unbroken, entire. Carpus of cheliped 

 with a single spine above, at distal angle; hand light colored, 

 fingers without dark color. 



magister, p. 229. 



2. Carapace widest at ninth anterolateral tooth. 



a. Tenth anterolateral tooth (counting that next to the eye as one) 

 prominent, 

 i. Tenth anterolateral tooth usually spiny-pointed, never broadly 

 rounded; rarely an eleventh tooth. 



a. Carpus of cheliped with two prominent spines (not count- 



ing that at hinge), one above, at distal end, and the 

 second below it, at inner angle. 

 i. Tenth anterolateral tooth projecting laterally beyond 

 carapace as seen from above; carapace compara- 

 tively smooth, without pubescence. Hand of cheli- 

 ped light colored; fingers without dark color. 



gracilis, p. 232. 

 ii. Tenth anterolateral tooth projecting dorsally, not 

 reaching beyond outline of carapace as seen from 

 above ; carapace hairy, markedly areolated, granu- 

 lated, granules in scattered groups. Hand of cheli- 

 ped light colored; fingers with blotch of dark color, 

 extreme tips light colored. 



gibbosulus, p. 226. 



b. Carpus of cheliped with a prominent spine above, at distal 



end; below this, at inner angle, an inconspicuous spine 

 sometimes present. Carapace granulated, granules 

 crowded. Hand of cheliped light colored, fingers with 

 blotch of dark color, extreme tips light colored. 



antennarius, p. 224. 



