1917 Way; on Taxonomy of Crabs 369 



legs and many parts of the body are covered with a short pubescence" 

 (Holmes, 1900). 



This has been found in the vicinity of Friday Harbor but not during 

 the summer of 1916. Miss Rathbun reports that it ranges from depths of 

 27 to 603 fathoms. 



Genus Oregonia 

 1. Oregonia gracilis Dana. decorator crab (fig. 20) 



Oregonia hirta Dana; Oregonui longimana Bate. 



Rostrum bifid ; in males two-thirds the length of the antennae, longer 

 than in the females. Carapace triangular in shape; sparsely covered with 

 stiff hooked hairs and roughened by minute tubercles ; "median, cardiac and 

 branchial regions tumid" ; postorbital spine sharp, curved toward anterior 

 of carapace, some distance below orbit, more noticeable in males than in 

 females ; the partition between the antennulary pits is produced forming 

 a spine. Chelipeds slender, very long in adult males ; merus sometimes, 

 longer than the rostral horns, subcylindrical, covered with tubercles and 

 setose hairs ; carpus rounded, roughened ; hands with a more or less ir- 

 regular row of roughened tubercles on the upper margin ; fingers longi- 

 tudinally grooved, gaping at base in adult males. Walking legs long, 

 slender, subcylindrical, sparsely covered with setose hairs; dactyls long, 

 sickle-shaped, ending in corneous tips. Color tan or gray, with dots and 

 small markings of red. Color cannot be seen until decorative material 

 is removed. 



There is such a marked difference in the general appearance of the 

 males and the females that some have been led to describe them as two 

 species. In the males the legs are much longer, the chelipeds stouter and 

 with a deeper depression at the base, and the body more slender. The 

 females are thicker in the post cardiac region, and the body and legs more 

 hairy. They are found at all depths from low tide to 55 fathoms and 

 possibly greater depths. They are particularly abundant on tlie old piles 

 of the Friday Harbor dock (1), the eelgrass (Zostcra marina) off Brown 

 Island (8) and the beaches east side of the Marine Station (5); also 

 found off tlie northeast corner of Brown Island (8); off" Canoe Island 

 (16); between Turn Island and San Juan Island (10); off Miimesota 

 Reef (11). 



Genus Epialtus 

 1. Epialtus prcductus Randall. hk; kkm* ( hah (rn;. 25) 



Rostrum bifid; horns short, broad at the base, inner margins slightly 

 concave and outer slightly convex; in younger siiecimrns the hooks at distal 

 end extend inwards; hairs are present on inner lateral margins and dor- 

 sal surfaces of the rostral horns, disappearing in older ones from both 



