GT. iroO7. NEw CRINOIDS — SLOCoM. 275 
Among the crinoids collected in this work several proved to be 
either hitherto undescribed or new to the Area. Of these five had been 
described from other localities and nine were new species. Of three spe- 
cies previously described by other authors, additional characters, which 
are here given, were obtained from specimens found by the writer. 
The nine new species are here described and five species previously 
described from other localities are here re-described. A total of seven- 
teen species of crinoids is therefore described in the present paper. 
CLASSIFICATION AND TERMINOLOGY 
The classification here used is that prepared by Wachsmuth and 
Springer and is substantially that given in the English edition of 
Zittel’s Text-book of Paleontology. The terminology of Wachsmuth 
and Springer is also adhered to. It may be briefly stated as follows: 
Crinoid: A normal crinoid consists of a crown attached by its 
dorsal extremity or base to a stem or column which is fixed to some, 
solid body by a root. 7 
Crown: All of the crinoid above the stem. It includes the calyx 
and the arms. 
Calyx: The body of the crinoid without the free arms or stem, 
It incudes the dorsal cup and ventral disc or tegmen, and within it are 
enclosed the more important organs of the body. 
Dorsal Cup: That part of the calyx below the point of attachment 
of the freearms. It is usually more or less cup-shaped and is composed 
of two or more rows ot plates having a more or less complete pentamer- 
ous symmetry. 
Ventral Disc, Tegmen, Dome, etc.: That part of the calyx above the 
point of attachment of the free arms. It is made up of plates more or 
less regularly arranged and contains the mouth and usually the anal 
opening. 
Base: That part of the dorsal cup lying between the radial plates 
and thestem. It consists of a single row of plates, the basals, ina 
monocyclic base, and of two rows of plates, the basals and infrabasals, 
in a dicyclic base. 
Rays or Brachials: The series of plates which rests upon the basals 
and extends up to and forms the arms. The first plate of the series 
is always a part of the dorsal cup, the others may or may not be a part 
of the cup. There are five of these rays, except in the Zophocrinide, 
and they are designated as follows: (Figs. 1 and 2) (1) right posterior 
ray, (2) right anterior ray, (3) antertor ray, (4) left anterior ray, and (5) 
left posterior ray. 
