24 



from a Batocrinus, and, if wc had two specimnns, we would 

 bo coiitident that it could perpetuate itself and. therefore^ rank 

 as a spc(;ies; Ijut, if the single specimen is all that ever ex- 

 isted, wo 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 onetiftli of 

 the body was absent from its birth or incej)ti()n. Under all ' 

 the circumstances, probaV)]y, the specific name should bo re- 

 ceived only provisionally. 



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

 now in tlio collection of S. A. Miller. 



BATOCRINUS FORMACEUS, n. Sp. 

 Pla'e I, Fig. 23, azygous view; Fig. 24, opposite view. 



Species medium or above medium size. Calyx V)owl 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 slo]nng side two secondary radials, the 

 last of which is axillary and su])ports upon each upper slop- 

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

 four arms. In one of the lateral rays thei'o are upon one side 

 three secondary radials and upon the other two secondary 

 radials, the last IjCMng axillary and supporting upon each iij)p<'r 

 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 ojicnings 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 throe to live. The azygous 



