24 



from a Baiocrinus, and, if we had two specimens, we would 

 be confident that it could perpetuate itself and, therefore, rank 

 as a species; but, if the single specimen is all that ever ex- 

 isted, we would say it is abnormal, and only proves the great 

 vitality the species possessed, that gave it the strength to grow 

 to maturity in the perfect form of its kind, while one-fifth of 

 the body was absent from its birth or inception. Under all 

 the circumstances, probably, the specific name should be re- 

 ceived only provisionally. 



Found in the Burlington Group, at Sedalia, Missouri, and 

 now in the collection of S. A. Miller. 



BATOCRINUS FORMACEUS, n. Sp. 



Plate I, Fig. 23, azygons view; Fig. 24, opposite view. 



Species medium or above medium size. Calyx bowl- shaped, 

 semi-elliptical, broadly rounded below; height two-thirds the 

 diameter; no radial ridges; sutures distinct, not beveled; sur- 

 face granular. Column small, round. 



Basals form an hexagonal disc about twice as wide as the 

 diameter of the column with an hemispherical columnar 

 cavity radiately furrowed. First radials large, expanded, three 

 hexagonal and two heptagonal. Second radials, quadrangular, 

 a little wider than long. Third radials one-half larger than 

 the second, pentagonal, except the one upon the left of the 

 azygous area, which is hexagonal, and three of the rays sup- 

 port upon each upper sloping side two secondary radials, the 

 last of which is axillary and supports upon each upper slop- 

 ing side two tertiary radials which gives to each of these rays 

 four arms. In one of the lateral rays there are upon one side 

 three secondary radials and upon the other two secondary 

 radials, the last being axillary and supporting upon each upper 

 sloping side two tertiary radials, which gives to this ray three 

 arms. In the ray opposite the azygous area the third primary 

 radial supports, upon each superior side, three secondary 

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

 fore, seventeen arm openings to the vault in this species. 



The regular areas do not connect with the vault, except in 

 the area between the two and three-armed rays and the num- 

 ber of plates in each varies from three to five. The azygous 



