180 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



F^ Second postero-lateral tooth absent. Ninth lateral 

 tooth strongly produced. Middle of supra-orbital 



margin truncate irroratus, p. 180. 



F2. Second postero-lateral tooth present. 



G'. Antero-lateral teeth simple, not denticulate nor 

 lobulate; seventh tooth enlarged and promi- 

 nent; width of carapace nearly or quite as 

 great at seventh as at ninth tooth. Carapace 



very uneven, lumpy amphioetus, p. 205. 



G^. Antero-lateral teeth denticulate or lobulate and 

 subtruncate. 

 H'. Antero-lateral teeth 1 to 8 bideuticulate, the 

 denticles alternating large and small. Median 

 tooth of front very small, not advanced 

 beyond adjacent pair. Middle projection 

 of supra-orbital border a shallow tooth or lobe. 



edwardsii, p. 193. 

 H-. Antero-lateral teeth multidenticulate. Med- 

 ian tooth of front well advanced beyond 

 adjacent pair. Middle portion of supra- 

 orbital border truncate plebejus, p. 198. 



D2. First postero-lateral tooth absent or represented by a rudiment. 



E'. Hairy all over. Antero-lateral teeth alternately large 



and small, more or less narrowly triangular, spiny pointed. 



Middle portion of supra-orbital margin a shallow lobe. 



jordani, p. 215. 

 E^. Dorsal surface naked or nearly so. Antero-lateral teeth not 

 regularly alternating (except in anthonyi 5 mm. wide or 

 less) . 

 F^. Carapace naked, nearly smooth. Interocular frontal 

 teeth united in a flat, produced lamina with arcuate 

 edge, the teeth indicated by closed fissures. Antero- 

 lateral teeth never spiny-pointed. Middle of supra- 

 orbital margin subtruncate productus, p. 203. 



F^. Carapace uneven, lumpy. Frontal teeth thick, sub- 

 acute. Antero-lateral teeth broadly triangular be- 

 coming quite blunt anteriorly-. Middle of supra- 

 orbital margin a shallow tooth or lobe_ anthonyi, p. 218. 

 C^. Branchial regions nearly meeting on median line. Interocular front 

 well advanced beyond outer orbital angle, and divided into 5 very 

 shallow lobes. Edge of middle of supra-orbital margin concave. 



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. Three 



middle teeth of front truncate. Fingers almost wholly dark colored. 



oregonensis, p. 226. 



CANCER IRRORATUS Say 



ROCK CRAB 



Plate 85, Figure 1 



Cancer irroratus Say (part, male), Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 

 1817, p. 59, pi. 4, fig. 2 (type-locality, "inhabits the ocean"; type not extant). 

 —Smith, Rept. U. S. Commr. Fisheries, vol. 1, for 1871 and 1872 (1873), 

 pp. 312 [18], 530 [236], 546 [252].— R. Rathbun, Fisheries and Fishery 



