35 



Basals form an hexagonal disc about one-half wider than the 

 diameter of the column, and "which extends, in a low rim, be- 

 low the first radials. First primary radials wider than long, 

 three hexagonal, two heptagonal. Second primary radials quad- 

 rangular, and about twice as wide as long. Third primary 

 radials about twice as large as the second, and about twice as 

 wide as long, pentagonal, axillary, and each one, adjoining the 

 azygous area, bears on the distal side two secondary radials 

 and on the proximal side two secondary radials, the last being 

 axillary and supporting upon each upper side a single tertiary 

 radial which gives to each of these rays three arms. Each 

 lateral ray is constructed in the same manner and each bear 

 three arms. In the ray opposite the azygous side the third 

 primary radial bears upon each upper sloping side three sec- 

 ondary radials, which gives to this ray two arms. There are, 

 therefore, fourteen arms in this species. 



The interradial areas are elongated and the plates connect 

 with those of the vault. The first plate is about the size of a 

 first primary radial; it is followed by two small plates in the 

 second range, and one or two in the third range, and these by 

 one or two that connect with the plates of the vault. There 

 are, in these areas, from five to seven plates. The azygous 

 area is large and contains twelve plates. The first one is in 

 line with the first primary radials and of about the same size; 

 it is followed by three plates in the second range, four in the 

 third range, and four in the fourth range, three of which con- 

 nect with the plates of the vault. 



The vault is highly convex centrally and depressed toward 

 the margin, in the interradial areas, and covered with poly- 

 gonal convex plates. A large plate occupies the central part 

 of the vault, and adjoining it on the azygous side is a small 

 azygous orifice directed upward. There is no proboscis, though 

 the plates surrounding the orifice are elevated higher than the 

 central plate. There are no ovarian apertures. 



This species is distinguished by its general form and four- 

 teen arms from all other species. By some it will be classed 

 in the genus Dorycrinus, but we are not inclined to extend the 

 genus Dorycrinus to include such species as this, for by so 

 doing it will graduate into Baiocrinus. In Dorycrinus there are 



