CALIFORNIA STALK-EYED CRUSTACEA. 81 



Genus Brachynotus De Haan. 



Carapace snbquadrate, uot markedly striated, and having two teeth 

 behind the orbital angle. Front wide, not strongly deflexed. Maxillipeds 

 without a wide rhomboidal gap; ischium transversely truncated; merus 

 large and not produced at the antero-external angle; palp joined in a notch 

 at the middle of the distal margin. 



l^ype. — B. sexdentatus (Risso). 



Brachynotus nudus (Dana). 



Pseudograpsus nudus Dana, Proc. Acad. Nat. Sci. Phila., 1851, p. 249; 

 Crust. U. S. Expl. Expd., Part 1, 1852, p. 335, PI. XX, fig. 7. Stimp- 

 sox, Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 469. 



Heterograpsus nudus Stimpson, Proc. Acad. Nat. Sci. Phila., 1858 p. 104. 

 LocKiNGTON, Proc. Cal. Acad. Sci., Vol. VII, 1877, p. 152. Whit- 

 eaves, Can. Nat. (2), Vol. VIII, 1878, p. 471. Smith, Rep. Prog. 

 Geol. Surv. Canada, 1878-9, B, p. 206. Rathbun R., The Fisheries 

 of the U. S., Sec. 1, 1884, p. 765. Newcombe, Bull. Nat. Hist. Soc. 

 Brit. Col., 1893, p. 25. Ortmann, Zool. Jahrb. Abth. f. Syst., Bd. 

 VII, 1894, p. 715. Walker, Trans. Liverpool Biol. Soc, Vol. XII, 

 1898, p. 273. 



Heterograpsus sanguineus Kingsley (not De Haan), Proc. Acad. Nat. Sci. 

 Phila., 1880, p. 208. 



Carapace posteriorly flat, smooth and punctate, anteriorly convex, un- 

 dulated, and furnished with small, scattered granules. A curved line of 

 light-colored pits extending from the anterior end of the H-shaped im- 

 pression to the last antero-lateral tooth. Front bilobed, the median 

 emargination shallow, but comparatively broad. The two transverse 

 prominences behind the front are evenly rounded. Antero-lateral margins 

 strongly arcuated and granulated; the second tooth behind the acute 

 postorbital much smaller than the preceding ones. Posterior margin of 

 the epistome granulated, the arcuated median portion separated from the 

 subquadrate, projecting, lateral portions by a conspicuous, deep, smooth 

 interval. On the pterygostomian regions a ridge running parallel with 

 the antero-lateral margin and armed with numerous smooth, small, 

 rounded denticles or granulations. Maxillipeds punctated ; a groove 

 behind the broad, raised, inner margin of the merus. Chelipeds smooth, 

 and mottled above with small, round, red spots; antero-internal angle of 

 the merus in the adult male produced into a rounded, smooth lobe; carpus 

 with a subacute prominence on the inner side; hands smooth, with a fine 

 longitudinal ridge along the lower side of the outer surface; fingers with 

 small, corneous tips. In the males the hands are inflated and bear a large 

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