1 86 VERRILL 



Dorsal spines are numerous, pretty evenly distributed, and mostly 

 stand singly, arranged apparently in quincunx ; or they might be said 

 to form nine alternating rows, with some intermediate. Dorsal 

 median row distinct, but scarcely different in size. The dorsal spines 

 are rather short, for a Distolasteiias, and often a little clavate and 

 deeply fluted near the obtuse tips. Papular areas are mostly rather 

 large with few papulae. Minor pedicellariae are very small and form 

 dense wreaths around the middle of the spines. 



Superomarginal spines are like the dorsals, but a little longer; 

 they form a regular row, one to a plate. Inferomarginals rather 

 more slender, two to a plate, mostly flattened and slightly gouge- 

 shaped at the truncate tips, and with large clusters of minor pedicel- 

 lariae. Adambulacrals two to a plate, nearly equal, in two equal, 

 regular, divergent rows, slender, not flattened. The proximals and 

 epiorals longer; apical oral pair of spines stouter. The peractinal 

 plates are small and spineless or lacking. 



In the lane between the adambulacral and inferomarginal spines 

 there is a regular row of small papular areas, each having usually 

 a single papula. A similar series exists between the inferomarginals 

 and superomarginals. 



Dorsal major pedicellariae are mostly large, elongated, sometimes 

 nearly as stout as the spines, usually decumbent, with spatulate jaws 

 strongly unguiculate with one to three curved denticles at the tip. 

 Some are stouter, erect, more or less ovate. The denticles of the 

 dorsal major pedicellariae are few, large curved and interlocking, 

 sometimes only one fitting between two on the opposite valve ; often 

 two on each; or two on one and three on the other. Similar large 

 ones occur on the sides and on the actinal interradial areas ; those of 

 the latter areas are often more elongated and remarkably large. 



The adambulacral major pedicelleriae are more slender, lanceolate, 

 acute. 



The type is from Vancouver Island (No. 1346, Mus. Comp. Zool.). 

 The larger specimen (No. 19, Geological Survey of Canada) is from 

 British Columbia. 



This species is notable for its unusually numerous fluted dorsal 

 spines and very large unguiculate pedicellariae. 



The larger dry specimen mentioned above agrees very well with 

 the type, except in features due to its greater age. The dorso-lateral 

 spines are more numerous and cannot be said to stand in any definite 

 rows; their arrangement is in irregular quincunx, or in irregular 

 oblique transverse series of about five on each side of the slightly 



