88 The American Geologist. August. 1002. 
ON THE CRINOID GENERA SAGENOCRINUS, 
FORBESIOCRINUS, AND ALLIED FORMS. 
By Fkaxk Springek, East Las Vegas, New Mexico. 
I have had for several years a unique Upper Siktrian crin- 
okl from the Niagara shales at Waldron, Indiana, which fur- 
n:«-hes an interesting accession to the list of rare genera that 
have been found common to the western Niagara of the 
United States and the Wenlock limestone of England and 
Sweden. Several of them have been pointed out by Prof Wel- 
ler in his interesting paper on "The Silurian Fauna interpre- 
ted on the Epicontinental Basis" (Journal of Geology, VI, 
p. 672). To tliese may be added Barnvidcocrinus, one of the 
most extraordinary crrnoids of the Gotland rocks — almost as 
highly specialized as Crotalocriuits — which I have no doubt is 
represented in our Upper Silurian by the species described by 
S. A. Miller as CyUcocriiuis caiiaUciilafiis, Geol. Surv. Indi- 
ana, \'ol. 18, PI. V, figs. 13, 14; also Gjioi'iinocniiiis, which I 
have obtained from Tennessee. 
The specimen above mentioned makes the further addition 
of the genus Sageiiocrinits, well known by its typical species, 
6". c.vpansits, both in England and in Sweden. I call atten- 
tion to it now partlv for this reason, and partly as a text for 
s(jme observations upon the generic relations of this and allied 
forms. It is apparently a distinct species, and I propose for 
it the specific designation — 
Sagenocrinus americanus, n. sp. 
agenocrinus americanus 
Calyx elongate-pj^riform. witli straight sides. Calyx plates smooth, 
no': convex, and mostly flush with the general curvature. Infrabasals 
and basals large. Primibrachs two. Arms proportionally small and 
