SHALLOW-WATER STARFISHES 



195 



high as thick, mostly cylindric or slightly clavate, obtuse, but some 

 are acute. They are mostly surrounded by small wreaths of very 

 small minor pedicellariae. 



The dermal surface is notably smooth and even. The papular 

 pores are very small, not very numerous. Very acute lanceolate 

 major pedicellariae, of diverse sizes, abound on the surface. 



The superomarginal spines stand obliquely, mostly two or three 

 on a plate. They are longer than in the allied species, rather stout, 

 much flattened, and often a little grooved on one side distally, but 

 not thickened as in A. anomala. 



Fi& 10. 



Atlosteriaj forficulosa Verrill. No. 1183, M. C. Z. Spines; a, intra-ambulacral; b, outer- 

 adambulacral; c, inferomarginal; d, superomarginal; e, dorsal. X 20. 



The inferomarginal spines are very similar in size and form ; they 

 stand two to a plate, in a regular double row. A wide, smooth 

 channel separates the two series of marginal spines, and a similar 

 channel separates the adambulacral series. These channels have 

 numerous rather large, very acute, lanceolate pedicellariae, and 

 many small papulae. The marginal spines all bear clusters of small 

 minor pedicellariae on the outer surface. 



The adambulacral spines appear crowded, in about three rows. 

 They mostly stand alternately, one and two to a plate. The inner or 

 furrow series stand erect. They are long, slender, very acute, and 

 bear clusters of major pedicellariae of diverse sizes, but mostly very 

 acute. The outer spines are shorter, stouter, obtuse, and mostly 

 bear clusters of very small minor pedicellariae on the outer side. 



