174 VERRILL 



the inner one with the spines horizontal and meeting or interlocking 

 over the middle of the groove in most places. 



The dorsal dermal major pedicellariae are large, long, mostly 

 compressed, with spatulate and denticulate valves; those between 

 the marginal spines are larger, with oblong or spatulate valves, 

 obtuse and dentate at the tips (see pi. LXXXII, figs. 2-2&). Colors 

 yellowish brown, the disk reddish brown. 



The type specimens are from Departure Bay, British Columbia 

 (coll. C. M. Young, Canadian Geological Survey). 



This may be merely a variety of the young of O. columbiana, 

 coming from the same district, but I have seen no intermediate 

 specimens. The remarkable regularity of the adambulacral spines 

 is a striking feature, as well as the regular spaced rows of dorsal 

 and marginal spines. 



ORTHASTERIAS CALIFORNICA Verrill, sp. nov. 



Plate LXVIII, figure 2 (actinal side of type) ; plate LXX, figure 5 (actinal side) ; 

 plate LXXX, figures 3-30 (spines and pedicellariae) ; plate LXXXI, figures 

 2-26 (pedicellariae and spines) ; text-figure 3. 



Rays five, elongated, narrow, well rounded above, constricted at 

 base. Disk small. Radii, 9 mm. and 86 mm.; ratio, 1 :9-5. 



Dorsal and marginal skeletal ossicles strong, arranged in rather 

 irregular longitudinal rows, each of the dorsals and superomarginals 

 bearing a single, rather elongated, stout, cylindric or little tapered, 

 blunt spine. The spines are pretty evenly spaced, nearly equal and 

 surrounded above the base (as dried) by a dense wreath of small, 

 ovate minor pedicellariae. The abactinal spines form five indistinct 

 rows proximally, but only three on the distal fourth of the rays. 

 They are remarkably uniform in size and length. The median row 

 is scarcely different from the others. Those on the disk are similar 

 and regularly spaced. 



The superomarginals form a single, regular row; they are like the 

 dorsals, but rather longer. The inferomarginals are decidedly 

 smaller and somewhat shorter. They stand mostly two to a plate; 

 the upper one of the pair bears a half-wreath of minor pedicellariae. 

 These spines are mostly flattened at the tips. On the proximal half 

 of the rays there is a simple row of peractinal spines, similar to the 

 adjacent marginals and close to them. 



Adambulacral spines are mostly two to a plate, rather long, very 

 slender, flattened, larger toward the mouth. Each jaw has a terminal 

 pair of short, notably stout, blunt, peroral spines, and a much longer 

 pair of tapered epiorals. 



