43 



DOLATOCRINU.S liASlI.K 'IS, 11. sp 



PIdIr III. tuj. I, hdSdJ rieir : Fiij. :', skiiuhH view; Fig. ■!, side view. 



Spt'cies larpe and yvvy iiiuch like Dolatocrinus indiavevs^is. 

 Calyx subcyliiulrical, very broadly tnnicated, and constricted 

 below the ambulacral openinjis. Kadial ridges small, angulai', 

 central nodes elongated Radiating lines from the central part 

 of each plate numerous. Column round and ha\ing a large 

 cinque foil columnar canal. 



Basal plates form a pentagonal disc about one third wider 

 than the diameter of the column and having an hemispherical 

 depression for the attachment of tlie column. First jirimary 

 radials from onethii-d to one half wider than long and subeqiuil 

 in size. Second primary radials about one-half wider than long, 

 quadrangular. Third primary radials ex[)and slightly to the 

 superior lateral angles. They are from one-half wilor to 

 twice as wide as long, pentagonal, axillary, and, in the rays 

 on each side of the azygous area and in the ray opposite tlie 

 azygous area bear upon each superior sloping si;le a single 

 secondary radial, which is axillary and bears upon each upper 

 sloping side two tertiary radials, which gives to each of these 

 rays four arms. In one of the lateral rays the third primary 

 radial bears upon one superior sloping side three secondary 

 radials, and upon the other a single secondary radial, which is 

 axillary and bears ui)on each ujiper slojiing side two tertiai-y 

 radials. This ray, therefore, has three arms. In the other 

 lateral ray the third primary i"idial bears upon each u]>per 

 sloping side three secondaiy radials, that give to it two arms. 

 There are. therefore, in this species, seventeen arms and sev- 

 enteen ambuhici-al npenings tu the vault, all of which are di- 

 rected upward. 



TIk^ azyg(jus area is substantially like the other areas. The 

 tirst interradials are the largest plates in the calyx, have nim^ 

 sides and are broadly truncated above for the second interra- 

 dials. The second interradials are about half as large as the 

 tirst, though somewhat luiequal in size. The third interradials 

 are less than half as large as the second, and are followed, in 

 one of the areas, by two plates, in the fourth range, that unite 



