SHALLOW- WATER STARFISHES 113 



The adambulacral spines are unusually numerous, crowded in 

 three or more rows. They stand mostly two on a plate, but often 

 there are three on part of the plates, or alternately two and three. 

 They are of moderate length, the outer ones longer, terete, slightly 

 clavate, obtuse; the inner ones shorter, acute. Oral spines stouter, 

 a little curved. 



The minor pedicellariae are very small and form small wreaths on 

 the dorsal and superomarginal spines. The major pedicellariae are 

 very numerous and small, ovate, those on the dorsal side are unus- 

 ually small and thickly scattered over the dermal areas. On the 

 ventral spines they are little larger and more acute, numerous on the 

 spaces between the actinal and marginal and adambulacral spines, 

 and also form clusters on the spines. Those on the lateral areas are 

 rather larger and more lanceolate, but still smaller than in most 

 species. All the papular areas are small. The madreporic plate is 

 large, with very numerous gyri. 



Gulf of Georgia (A. Agassiz, 1860, Mus. Comp. Zool., No. 1181). 



This species, as here described, resembles A. borealis in form, but 

 it has smaller and more numerous dorsal spines, not acervate, and 

 the actinal and adambulacral spines are more numerous and more 

 crowded. The pedicellariae are also different. 



M. Perrier (1875, p. 332) stated that he found in the British 

 Museum a number of specimens, some of which probably were 

 Gray's types (though the label was loose). Most of these were six- 

 rayed and monacanthid, but two were five-rayed. With them was 

 also a single specimen of a six-rayed diplacanthid species that 

 Perrier referred to A. douglasi, which last Bell, Perrier (1881), and 

 Ludwig ( 1900) referred to A. polaris borealis. 



It is evident that Gray's name must be applied to a diplacanthid 

 species, not to the monacanthid species to which Perrier restricted it, 

 and which I have named A. grayi. If it were really certain that the 

 specimens found by Perrier were Gray's cotypes, the name should 

 be applied either to the six-rayed one called douglasi by Perrier, or 

 to the five-rayed specimens referred to by him. But as the label was 

 loose, it may well have been misplaced in the long interval of time 

 (thirty-five years), or other specimens may have been added to 

 the original lot. Such accidents happen in all museums. It is not 

 unlikely that the douglasi Per. of the British Museum lot is the same 

 as the species described by me as katherina above. 



