A. E. Verrill — New Genera and Species of Starfishes. 65 



distantly scattered ; distally somewhat in rows ; also in ten 

 small clusters around the disk. Papular areas very large, with 

 very large dermal groups of minor pedicellarise, and also large 

 wreaths around the spines. Large wedge-shaped denticulate 

 dermal major pedicellarige are numerous. A simple upper 

 row of marginal spines like the dorsals ; infero-marginals much 

 stouter, two to a plate ; two regular simple rows of similar 

 stout actinal spines, with many large denticulate pedicellarige 

 between them. Adambulacral spines long and slender in a 

 very regular simple row. Large clusters of major pedicellarige 

 of various sizes, large and small, are attached within the 

 ambulacral grooves. Vancouver I. (Pro v. Mus., B. C.) ; British 

 Columbia (Canada Geol. Survey), and Puget Sd, (Prof. Kin- 

 caid, type). 



Allasterias Ver., gen. nov. Type A. JRathbuni Ver. 



Remarkable for the arrangement of the adambulacral spines, 

 in several series, of which one is deeper within the groove on 

 alternate plates. Disk rather large, areolate. Dorsal ossicles 

 numerous, but small, arranged, both on the disk and rays, in a 

 reticulate manner around the papular areas, which are numer- 

 ous, and bear large groups of small papulae. Spines numerous, 

 arranged irregularly, or placed around the papular areas, but 

 usually forming a median radial series. Upper marginal plates 

 rather large and stout, so as to form an angular margin, each 

 bearing several spines larger than the dorsals. Lower mar- 

 ginals not close to the adambulacrals, bearing in the type two 

 or three spines, longer than the upper ones. Actinals rudi- 

 mentary or lacking. 



Allasterias Rathbuni Ver., sp. nov. Figures 6, V. 



Pays five, broad at base and rapidly tapering to acute tips. 

 Padii, 25 and 100 mm ; ratios, 1 : 4. Small major pedicellarise 

 are abundant all over the dorsal and lateral surfaces. 



The whole dorsal surface is conspicuously areolate or reticu- 

 late, the areolations mostly 1*5 to 2 mm broad. The dorsal 

 spines are very small and numerous, sometimes almost like 

 round or capitate granules, being scarcely higher than thick, 



Fig. 7. — The same, var. nortonensis ; lettering as in fig. 6. x 6. 



Fig. 8. — Tosia arctica V. Some of tlie dorsal interradial plates with 



granules removed ; 8a, the same, some of the larger radial plates with 



granules and a pedicellaria ; others bared of granules and showing 



papulae ; much enlarged. 

 Fig. 9. — Tosia granidaris, dorsal radial plates, magnified the same as 



fig. 8a. 

 Fig. 10. — Asterias (Leptasterias) macropora V. Under side of ray of 



5-rayed Alaska specimen, with spines removed, showing large size of 



ambulacral pores ; x about 2. 



Am. Jour. Sci.— Fourth Series, Vol. XXVIII, No. 163.— July, 1909. 

 5 



