56 



Each plate bears a long central node or spine, from the base of 

 which, small lines radiate to the adjacent plates. Column small, 

 roaud, and inserted in the cup formed by the basal plates. 



Basal plates form the lower part of the funnel-shaped basal 

 concavity, and at the top have a diameter one-half greater than 

 the diameter of the column. First primary radials wider than 

 long, and bear a ridge extending from the superior middle part of 

 one to the superior middle part of the adjacent ones so as to form 

 a pentagonal rim to the funnel-shaped basal concavity and on 

 which the calyx will rest. The radial ridges arise from the angles 

 of this pentagon. Second primary radials a little wider than high, 

 quadrangular, sides parallel. Third primary radials about the 

 same size as the second, pentagonal, axillary and support on each 

 upper sloping side two tertiary radials. This gives to the species 

 ten arms, which are composed of a single series of plates. 



The first interradials are the largest plates in the body. They 

 are followed by a single plate in each area; about one-third as 

 large as the first, which unites with two plates belonging to the 

 vault. In the azygous interradius the second plate unites with 

 three plates belonging to the vault, which is the only difference 

 between the iuterradial areas. 



The vault is convex over the ambulacral furrows and abruptly 

 depressed in the iuterradial areas, aud bears a short central pro- 

 bosis. The vault is covered by two circles of large plates, the 

 inner circle has seven plates, and within it there is an extra plate 

 and then four plates stand upright and form the probosis which 

 bears the azygous opening. There is an "ovariau aperture" on each 

 side of the base of each arm, or twenty of these orifices in this 

 species. It will be noticed that, in some species, these apertures 

 are in the iuterradial areas, at some distance from the arms, 

 while in this and some other species, they are not in the iuter- 

 radial depressions, but elevated and close to the ambulacral open- 

 ings. 



This species is most nearly related to Dolatocrinus bulbaceus, 

 but differs in the general form and surface ornamentation. Tliis 

 species has an azygous side and "ovarian apertures," while tliat 

 species has neither. Four specimens belonging to this species 

 possess the same characters, and differ only, in the fact, that the 

 nodes or spines on some specimens are longer than ou others. 



