180 A. E. Yerrill — Revision Genera and Species of Starfishes. 



intervening spaces, in which there are usually five or six groups of 

 papular pores, the individual pores being small and unequal, two or 

 three or more forming each group. 



Each of the larger abactinal radial plates is covered with a rosette 

 consisting of about five to seven central, and twelve to fourteen 

 marginal, short, blunt or clavate, granule-like spinules, rather longer 

 than broad. Some of the disk-plates are larger with more spinules. 

 A large valvular pedicellaria often replaces the central group of 

 spinules on some of the plates. These occupy nearly the whole 

 breadth of the central ai-ea of the plate, and are narrowly oblong, 

 not much elevated, with a nearly even and straight margin. Similar 

 pedicellaria?, as well as some much narrower ones, occupy the central 

 area of some of the actinal disk-plates. 



The madreporic plate is small, sunken, with narrow, acute gyri. 

 The central nephridial pore is small but distinct. 



The actinal disk-plates are crowded and closely united ; those 

 next the adambulacral plates are squarish or rhombic and form 

 regular rows, but those in the angles are smaller, in-egular, and more 

 rounded. All are covered with rosettes of granules, or short, obtuse, 

 often prismatic spinules, rather larger and less regular than those of 

 the upper side. A central valvular pedicellaria occurs on some of 

 the plates, as stated above. 



The adambulacral plates are squarish, not very large. Each bears 

 a marginal row of three or four, small, oblong, more or less prismatic 

 or compressed, blunt spinules, the middle one usually a little larger 

 than the others. External to these are two sets of shorter spinules, 

 about three in each series ; these sometimes form two rows, but in 

 other cases are in a rosette-like group ; those next the inner or 

 groove-series are longer than the others ; one or more of these, 

 especially distally, may be replaced by a spinuliform pedicellaria 

 with two or three blades. On the distal part of the ray one or two 

 of the spinules on the central part of these plates becomes considera- 

 bly longer and larger than the rest. The oral spinules are similar 

 to the adambulaci'al, but those at the tip of the oral plates are rather 

 larger and more angular. The apical ^Jlates are rather small, promi- 

 nent, somewhat obovate. 



Radius of disk, 13"""; of rays, SG""". 



Off Wilmington, Cal., 27 fathoms, U. S. Nat. Mus. 



