of the Subfamily Aster inince. 483 



Though normally five-rayed, six-rayed and seven-rayed exam 

 pies often occur. It is a typical Patiria, closely allied to the 

 type. It has been well described and illustrated recently by 

 Professor Fisher. The following remarks are intended chiefly 

 to illustrate the generic characters. 



The larger plates of the papular areas, when the spinules 

 are removed, have the admedian edge prominent, lunate, con- 

 cave beneath, for the papular pores, and having, on the convex 

 upper side, a raised lunate ridge or crest, which carries the 

 spinules. The small interpolated ossicles form clusters, often 

 of ten to fifteen or more, and on the central area of the disk, often 

 of twenty or more. They are mostly ovate or pyriform with 

 the smaller end inserted into the dermis-like pegs. They do 

 not show on the interior surface. Near the end of the ray, 

 beyond the papulae, the plates are small, roundish or pele- 

 coidal, with an evenly convex surface. When well preserved 

 or jiving the plates are covered by a rather thick canaliculated 

 dermis. 



The papulae form ten to twelve radial rows, or even more in 

 large specimens, and extend over the inner part of the inter- 

 radial areas and center of the disk. 



Seen from the inside, the larger radial plates of papular areas 

 are stout, mostly four-lobed, with the two rounded abmedian 

 lobes underlapping two adjacent plates ; and the two admedian 

 lobes overlapping the lobes of two plates, with a large papular 

 pore between the lobes. The plates that form the two median 

 rows are obliquely placed, long-ovate, curved, not lobed inter- 

 nally, but with the smaller ends crossed over the median line. 



Beyond the papular areas, in the interradial areas, the dorsal 

 plates have a "descending conical process, becoming longer on 

 the plates nearer the margin, and united to the ventral plates by 

 a similar process from the latter, or by an interpolated ossicle. 



Patiriella Ver., nov. Type, P. regularis Ver. 



The type has two furrow-spines, sometimes three adorally, 

 and one on the outer surface ; these are rather large, tapered, 

 acute, not webbed ; spines of the ventral plates are similar, 

 usually solitary. The ventral plates form numerous oblique 

 rows, about fifteen in the longer rows ; adoral ones are large 

 and thick, the exposed part three-lobed or shield-shaped, some- 

 times four-lobed ; innermost odd one larger, bilobed, or sub- 

 cordate ; distal ones lancet-shaped ; jaw-plates large and thick, 

 angular, prominent ; comb of spines about five on each side, 

 stout, blunt. 



The larger dorsal radial plates are prominent, arched or 

 lunate, strongly concave and notched beneath, for exit of pap- 

 ulae ; on the summit there is a single or double curved row of 



