SHALLOW-WATER STARFISHES 293 



Radii of the type, 31 mm. and 45 mm. to 50 mm. It grows to a 

 much larger size. 



The marginal plates are coarsely granulated. The upper ones 

 often have a bivalve pedicellaria near the inner edge. The granules 

 are unequal in size, angular, closely in contact, about eight in a trans- 

 verse row on the larger plates. The marginal plates in the inter radial 

 region are squarish and pretty regular, and paired above and below ; 

 distally they become irregular, polygonal, with rounded corners, and 

 often appear broken ; they partially alternate in the two rows. The 

 subapical plates are small; the apical or ocular plate is very small 

 for this genus. 



The lower marginal plates are closely granulated nearly all over, 

 except a very small naked spot beneath. The upper ones also have 

 a large naked spot, near the upper margin, covering about one-fifth 

 of the surface of the plate, perhaps where the granules have been 

 accidentally rubbed off. The actinal plates are large, mostly 

 squarish ; about three correspond to the breadth of each inferomar- 

 ginal plate, proximally. 



The dorsal plates are unequal in size, crowded, larger than in 

 most related species, slightly and evenly convex, and very closely and 

 coarsely granulated, the median radial and submedian rows mostly 

 hexagonal, as well as most of the interradials. Along the interradial 

 margins three to four dorsal plates correspond to one upper mar- 

 ginal. The granules are coarse, angular, unequal in size, flattish or a 

 little convex, pretty closely in contact, mostly eight to ten on the 

 larger plates. 



Small valvular pedicellariae, commonly a little larger than the 

 granules, but often of about the same size, occur on a few of the 

 dorsal plates, on the marginals, and also sparingly on the actinals. 

 The valves, which in the larger ones project a little above the 

 granules, are thin and flat, about as high as broad. They are mostly 

 sunken in small, roundish, oblong or slightly bilobed pits. 



The actinal interradial plates are granulated like the dorsals ; they 

 are more regular in form. Adambulacral plates often bear a bivalve 

 pedicellaria; they have about six short, thick, angular spinules, 

 crowded in two rows and all similar in height and size to the 

 adjacent granules. The inner or furrow margin bears" but two, or 

 rarely three, short, thick spines. 



This somewhat resembles C. granularis, but its granulation is much 

 coarser, its margins thicker and more rounded, and its distal mar- 

 ginal plates more irregular. The adambulacral spines are much 



