ASTEROIDEA OF NOETH PACIFIC AND ADJACENT WATERS FISHER. 



131 



Young. — The smallest specimen has R = 12.5 mm.; R = 3 r. There are no 

 papulae, and one would refer it without hesitation to Chelrader. Large abactinal 

 spines undeveloped, and madreporic body adjacent to superomarginals ; unlike the 

 adult, the superomarginals encroach conspicuously on abactinal area; one supero- 

 marginal and two inl'eromarginal spines, the au.xiliary spinules being nearly as long 

 as spines. Furrow spines, three to five; actinal adambulacral spines, two. Two 

 interradii have each a pedicellaria;" no abactinal pedicellariaj (station 4784). 



.^Vjiother larger example, same locality, has R = 25 mm., R = 5 r. Some of 

 the dorsal sjiines have appeared ou disk; only two or three papulae; madreporic boily 

 still near margin; marginal spines relatively longer; pedicellaria in each interradius. 

 A specimen from station 3223, with R = 40 mm., has accpiired abactinal pedicellariaj ; 

 and the dorsal spines, though fewer than in adult, extend all along the ray. The 

 papulaj are confined to base of ray, are few m number, but area extends all the way 

 across ray. Dorsal muscles well developed. An example with R = 56 mm., R = 5 r, 

 has the same appearance as the very large specimens, except that the papular area 

 is not so e.xtensive nor the dorsal spines so numerous, and the madreporic body is 

 nearer to margin. 



Type. — In the Yale University museum. 



Type-locality. — Off Queen Charlotte Islands, 111 fathoms. 



Distribution. — Bering Sea (Pribilof, Aleutian, and Commander Islands), south 

 along the coast of ^Vlaska to Queen Charlotte Islands, British Columbia, in 56 to 

 159 fathoms. 



Specimens examined. — Forty- two, from the following stations: 

 Specimens of Luidiaster dawsoni eocamined. 



2842.. 

 2833.. 

 3223.. 

 3225.. 

 3320.. 

 3339.. 

 3500.. 

 4784. . 

 4790.. 



4791.. 

 4792.. 



Near Unalaska, Alaska... 

 South of Kadfak, Alaska. 

 Near Unalaska, Alaska... 



East of Sliumagin Islands, Alaska . .. 

 Near St. George Island, Bering Sea . . . 



Near Attu Island, Aleutians 



Near Bering Island, Commander 

 Islands. 



Character of bottom. 



pebbles 



gray sand 



black pebbles 



black sand 



....do 



mud gravel 



flue gray sand, gravel 



coarse pebbles 



pebbles 



rocky 



pebbles 



U. S. Nat. Mus. 



AUxUrost, 1906. 

 Do. 



Remarks. — Ludwig (1910) has placed my Cheirasier horridus from the Hawaiian 

 Islands under the present species. It is, however, distinct, and if compared with 

 an equal sized specimen of dawsoni presents the following differences. Compare 

 also pi. 17, fig. 3, Starfishes of the Hawaiian Islands, \vith pi. 119, fig. 2, this report. 



" The young of Acantharchaster was stated by me (Bull. U. S. Fish Comm. for 1903, pt. 3, p. 1043) to 

 be without pedicel lariie. The specimens I had then were the young of Nearchastcr variabilis. 



