252 VERRILL 



fifteen to twenty small, round pseudopaxillae, with rather long 

 spinules. Otherwise the characters are as in the type. 



A dry, thirteen-rayed specimen, in poor condition, from Esqui- 

 mault Harbor, has unusually small dorsal pseudopaxillae, so crowded 

 that when the regularly stellate spinules are expanded the adjacent 

 stars touch each other by their edges, or interlock, over most of the 

 surface. 



A fifteen-rayed young specimen (radii, 47 mm. and 18 mm.) from 

 Vancouver Island (see fig.) has four of the contiguous rays on one 

 side shorter than the rest, the two intermediate equal ones shorter 

 than the next on each side, which are also nearly equal, thus giving 

 the specimen a bilateral symmetry. The oral spines are four on each 

 jaw, rather stout, nearly equal; epiorals two to four, also rather 

 stout ; laterals small, slender, graded, about six on each side. Actinal 

 interradial pseudopaxillae are few and very small. Adambulacral 

 groove-spines about three in middle of rays, rather strong, often 

 four proximally ; comb-spines about four, subequal. Dorsal pseudo- 

 paxillae very numerous, small, nearly even, circular ; those on the rays 

 very small and crowded distally. 



A somewhat smaller thirteen-rayed specimen (radii, 42 mm. and 

 16 mm.), from the same locality, agrees well with the last in the 

 dorsal and actinal paxillae, but has relatively smaller and more 

 slender adambulacral and oral spines. The apical jaw-spines are 

 mostly six on each jaw, small and slender. 



This species has a wide range, especially from Monterey Bay, 

 California, to the Aleutian Islands. It is common in the waters of 

 Puget Sound and British Columbia. I have studied specimens, sent 

 by the Canadian Geological Survey, from Virago Sound; Queen 

 Charlotte Islands; Powell Island, Gulf of Georgia (G. M. Dawson). 

 Esquimault Bay (C. F. Newcombe). Vancouver Island; Departure 

 Bay (Geological Survey of Canada) ; and from other localities. 



Whiteaves (1886) recorded it from Powell Island, Malaspina 

 Inlet, and Galatos Channel (abundant at low tide). 



Fisher records it from many localities from Monterey Bay to the 

 Aleutian Islands, from low tide to 123 fathoms. He also records it 

 from more northern localities; but some, if not most, of these 

 localities refer to 5*. dawsoni arctica Verrill, perhaps a distinct 

 species, which he did not distinguish. 



His more northern localities include the Kuril Islands (229 

 fathoms) ; Shumagins ; and Point Franklin, on the Arctic Ocean. 

 The latter is the type-locality of S. dawsoni arctica Verrill. 



