24 . CALIFORNIA ACADEMY OF SCIENCES. 



may be two rows of curved setae. Kostral horns flattened, with convex 

 outer margins, the notch between them narrowly triangular and setose. 

 On the upper side of the rostrum there are two double rows of curved 

 setae. Preorbital tooth large, triangular, acute; postorbital small and point- 

 ing obliquely downwards, and separated by a fissure from the preorbital 

 tooth. The lateral expansions of the carapace area little reflexed, and the 

 margin behind the incision is nearly twice the length of that in front. 

 The antero-lateral and postero-lateral angles are wide and the latter are 

 somewhat produced. An obsolescent tubercle on the posterior part of the 

 branchial region. Pterj'-gostomian regions with several blunt teeth. Pedun- 

 cle of antennae about reaching tip of rostrum. Chelipeds of the male 

 large, the merus rough and cristate on the inner margin; carpus with a 

 lamina on the inner margin; hand oblong, the fingers bent downward and 

 curved inward, somewhat gaping near the base but distally dentate. In 

 the females and young males the chelipeds are relatively smaller, the crista 

 on the merus not so prominent, and the fingers contiguous and dentate 

 along the entire inner margin. First pair of ambulatory legs longer and a 

 little more compressed than the others, the penultimate joint subcarinate 

 above. Abdomen of female elliptical, seven jointed. Abdomen of the male 

 widest at the third segment, narrowing rapidly to the fifth which is about 

 equal to the sixth; last segment narrow and longer than the preceding one. 



Color a dull purplish, the legs crossed by light bands. 



Length of carapace 30 mm.; greatest width 32 mm. 



Found among rocks at low tide. Alaska; British 

 Columbia (Rath.); northern to southern California! 

 Mexico (Milne-Edwards). 



Genus Paigettia Dana. 



Rostrum two-spined. The margin of^'the carapace behind the eyes is 

 produced into an alate expansion behind which it is somewhat constricted. 

 The upper surface of the carapace is furnished with spines or tubercles. 

 The flagella of the antennae are not entirely covered by the rostrum. The 

 ambulatory legs are slender and do not have the penultimate joint dilated 

 and compressed. The preocular spine is large and the eyes are mobile. 



Type. — P. gracilis'DA'SA. 



Pugettia Richii Dana. 



Pugettia Richii Dana, Am. Jour. Sci. (2), Vol. XI, 1851, p. 268; Crust. U. S. 

 Expl. Expd., Part I, 1852, p. 118, PL IV, Fig. 4. Stimpson, Journ. 

 Best. Soc. Nat. Hist., Vol. VI, 1857, p. 457. Lockington, Proc. Cal, 

 Acad. Sci., Vol. VII, 1877, p. 76. Miers, Challenger Reports, Vol. 

 XVII, 1886, p. 40. Newcombe, liuU. Nat. Hist. Soc. Brit. Col., 1893, 

 p. 21. Rathbun M., Proc. U. S. Nat, Mus., Vol. XVII, 1894, p. 71. 



