1917 Way; on Taxonomy of Crabs 367 



Family PILUMNIDAE 



Genus Lophopanopeus 



1. Lophopanopeus bellus (Stimpson) Rathbun. black-clawed crab 



(fig. 22) 



Xantho hella Stimpson; Xanthodes hemphillii Lockington; Xanthodes 

 liemphilliana Lockington; Lophoxanthus bellus Milne-Edwards; Lopho- 

 zozymus bellus Miers ; Lophoxanthops bellus Holmes. 



Rostrum none. Front sinuate with median notch. Antennae short, 

 inconspicuous. Antennules folding obliquely. Carapace broader than 

 long, broader than anterior part, flattened behind, convex in front with 2 

 prominent notches at the junction of the anterior lateral and posterior-lat- 

 eral margins ; teeth small, posterior one smaller than the anterior ones ; not 

 pubescent or tubercled but cut with irregular sulci which make a distinctly 

 areolated surface. Chelijaeds strong and powerful; hands rounded on 

 upper side more or less inflated, carpus roughened on dorsal side with 1 

 prominent tubercle on distal end near dorsal edge on the inside ; merus 

 with few irregular teeth on upper margin at distal end. Dactyls and 

 propodi of walking legs hairy ; carpus short, bilobed on upper surface ; 

 merus with acute upper edge. Anterior part of carapace either reddish- 

 brown or purplish; posterior portion marked with gray; legs are colored 

 much the same as carapace but spotted considerably with gray ; occasion- 

 ally chelipeds are almost white but usually are same in color as carapace ; 

 dactyls always black; ventral surface a dull gray, much lighter than the 

 dorsal surface. 



Considerable variation in shades noted among them. Next to Hemi- 

 grapsus nudus they show the most variation of our species. The most 

 variation was found among those along the beach from Madrona Point (7) 

 to the beach west of Turn Island. L. bellus like Cancer oregonensis is 

 found buried in sand and mud under rocks on rocky shores. The two were 

 always found in the same places. They were collected on Brown Island 

 (8) at the northeast and southeast corners, and at the south end; rocky 

 points from Madrona Point (7) to Argyle Bay (14) ; Minnesota Reef (11), 

 Marine Station (5) to Cannery dock (4); off northeast corner of Brown 

 Island (8) in 20, 52 and 55 fathoms. 



Family MAIIDAE 



KEY TO GENERA 



A. Rostrum long, slender. 



B. Carapace with prominent spines on branchial region. 



CHORILIA (p. 368) 

 BB. Carapace without prominent spines on branchial region. 



OREGONIA (p. 369) 



