178 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



J'. A postero-lateral spine, not projecting 

 sideways beyond the carapace margin. 

 A strong tooth at middle of supraorbital 



margin branneri, p. 211. 



P. No superimposed spine on posterior mar- 

 gin of carapace. 

 K*. A strong tooth at middle of supra- 

 orbital margin. Carapace widest 

 at eighth tooth. Lateral teeth 

 denticulate on anterior margin. A 

 single tooth or spine on wrist. 



antennarius, p. 210. 

 K^. No strong tooth but a shallow lobe at 

 middle of supraorbital margin. Car- 

 apace widest at ninth tooth. 

 L^ Movable finger spinous above. 

 Lateral teeth with spinous mar- 

 gins. Carapace and legs coarse- 

 ly hairy polyodon, p. 202. 



1?. Movable finger granulate above. 



Lateral teeth with granulate 



margins and a slender spine at 



tip. Downy-hairy. Size small. 



jordani, p. 215. 



G^. Antero-lateral teeth truncate or subtruncate. 



H^ Edge of antero-lateral teeth denticulate or 

 lobulate; first tooth narrower than the 

 others. 

 J'. Outer orbital tooth not dentiform. Cara- 

 pace very convex. Basal article of 

 antenna twice as long as broad. 



edwardsii, p. 193. 

 J2. Outer orbital (half of the first antero- 

 lateral) tooth small, triangular, acute. 

 Carapace moderately convex. Basal 

 article of antenna about two-thirds as 



broad as long plebejus, p. 198. 



H2. Edge of antero-lateral teeth entire; first 

 tooth as wide as any of the next five; closed 

 sinuses deep, more than half as long as 

 width of teeth. Basal article of antenna 

 more than twice as long as wide. 



luederwaldti, p. 200. 

 B^. Branchial regions nearly meeting on median line. First antero-lateral 



(orbital) tooth wider than any of the next 7 teeth porteri, p. 199. 



A^. Antero-lateral and postero-lateral margins not meeting at a distinct angle. 

 Lateral teeth 12 or 13; carapace widest at seventh or eighth tooth. Dark 

 color of fingers reaching nearly to their bases oregonensis, p. 226. 



ANALOGOUS SPECIES OF CANCER ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



borealis edwardsii 



luederwaldti \ , , ■ 



[ plebejus 



