194 B GEOLOGICAL SURVEY OP CANADA. 



long, blunt spines, the middle ones longest. The adambulacral spines 

 esj)ecially the inner ones, are much larger and longer than in S. endeca 

 the latter usually having but two very small inner ones. 



" Asterias affijiis and A. alboverrucosa Brandt are probably a single 

 species of Solaster or Crossaster, but the descriptions are very brief and 

 imperfect. The former was described only from a figure of a young 

 specimen. Both are one inch in diameter of disk. Both are described 

 as having ten rays, with large scattered clusters of dorsal spines, 

 ("papilla?"), and as resembling C. papposus. The number of rays 

 cannot be regarded as a specific character. They may really belong 

 to 0. papposus." — Verrill. 



Cribrella Ixeviuscula, Stimpson. Common, from low-water mark to 15 or 

 20 fathoms. 



Dermaster imbricatus, Perrier. 



(=Asteropsis imbricata, G-rube, 1857. A. Agassiz, North 

 American Starfishes, 1877 ; p. 106, pi. xv., figs. 1-7.) 

 A rather common and brilliantly coloured, littoral species, found at 

 several localities. 



Asterina miniata, Brandt. (Sp.) Near low-water mark, abundant 

 locally. 



Mediaster aiqualis, Stimpson. Beach at Ramsay Island, one fine 



specimen only. 

 Ar chaster Dawsoni, Verrill. Sp. nov. 



" A large species, in form resembling A. tenuispinus of the North At- 

 lantic. Radius of the disk, -65 ; of rays, 4 inches. The rays are long,, 

 flat, regularly tapered. The upper surface is loosely covered with 

 small tubercles, bearing only circular groups of very minute, short 

 paxillse toward the margins of the rays ; but along the middle region 

 of the rays and over the disk bearing a long, tapering, acute central 

 spine, surrounded at base by a circle of small paxillag ; between the 

 plates there are, over the whole surface, numerous pores. Along each 

 ray, toward the marginal plates, there are, at irregular intervals, singu- 

 lar groups of small incurved spinules ; usually three or four clusters, 

 each cluster consisting of a row of three or four spinules, form one group ; 

 the ends of all the spinules converge to a pore in the centre of the 

 group. The upper marginal plates are small but prominent, and each 

 bears a long, rather stout, acute, erect spine, surrounded at base by a 

 group of slender, unequal spinules. The lower marginal plates mostly 

 bear three long and large divergent spines, the upper one largest, and 

 rather longer than those of the upper plates ; between and around their 

 bases there are slender spinules. The adambulacral plates bear upon 



