43 



DOLATOCRINUS BASILICUS, n. sp 



Plate I IT. Fig. /, basal view; Fig. summit view; Fig. 3 y side view. 



Species large and very much like Dolatocrinus indiavcnsis. 

 Calyx subcylindrical, very broadly truncated, and constricted 

 below the ambulacral openings. Radial ridges small, angular, 

 central nodes elongated. Radiating lines from the central part 

 of each plate numerous. Column round and having 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 the column. First primary 

 radials from one-third to one half wider than long and subequal 

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

 quadrangular. Third primary radials expand slightly to the 

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

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

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

 azygous area bear upon each superior sloping side 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 upon each upper sloping side two tertiary 

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

 lateral ray the third primary radial bears upon each upper 

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

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

 enteen ambulacral openings to the vault, all of which are di- 

 rected upward. 



The azygous area is substantially like the other areas. The 

 first interradials are the largest plates in the calyx, have nine 

 sides and are broadly truncated above for the second interra- 

 dials. The second interradials are about half as large as ti e 

 first, though somewhat unequal 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 



