VERRILL 



The North Pacific form is a deep-water species and hardly comes 

 within my limits, though Fisher has one locality in 41 fathoms, and 

 one in 56 fathoms, off Unalaska, in Bering Sea. Other northern 

 localities recorded by him are in 68 to 174 fathoms, from Bering 

 Sea to Southeast Alaska, Behm Canal, 4 (?) to 134 fathoms. Also 

 one specimen from Gulf of California, Carmen Island. 



Possibly his northern specimens are like those placed by me under 

 C. granularis. The two species are, apparently, very similar. 



Dr. Fisher also describes the allied species, C. japonicus (Sladen), 

 from deeper water, in Bering Sea and off Oregon, 184 to 786 fath- 

 oms; and C. leptoceramus F., from off Southern California, in 216 

 to 638 fathoms (op. cit., 191 ib, p. 210, pis. xxxix, LVIII, LX). 



Genus TOSIASTER Verrill, nov. 

 Type, T. arcticus Verrill. 



Pentagonal, with short rays. Marginal plates large, thick, 

 coarsely granulated. Dorsal plates are stout, closely granulated; 

 parapaxillae with lobed or stellate bases, and tabulate tops. Papulae 

 widely distributed, not confined to the radial areas, usually in small 

 groups of two to five. 



Adambulacral plates are notably short; actinal side with four to 

 six granuliform spinules; furrow-spines usually two or three to a 

 plate. 



Interactinal plates nearly rhombic, closely covered with angular 

 granules. 



Bivalve pedicellariae occur on the marginal, interactinal, and 

 adambulacral plates. Superomarginal plates often have a naked 

 central area. 



TOSIASTER ARCTICUS Verrill. 

 Plate L, figures 3, 30; plate xcix, figures I, 2 (type). 



Tosia arctica VERRILL, Amer. Journ. Sci., xxvin, p. 63, July, 1909, figs. 8-80. 

 Ceramaster arcticus FISHER, op. cit., 19116, p. 219, pi. XL, figs, i, 2; pi. LVIII. 

 fig. i; pi. LX, fig. i. 



The disk is pentagonal with short rays and thick, rounded mar- 

 gins. In alcohol the granules and most of the outlines of the dorsal 

 plates are obscured by a soft, membranous or mucous structure. 

 The marginal granules of adjacent plates are in contact and cover 

 narrow channels between the plates, which have a low, round, 

 columnar form when the granules are removed. Very small papulae, 

 standing in small groups, surround the plates. 



