34 
SMITHSONIAN INSTITUTION 
Laurelocrinus spinoradialis new species 
Plate j, figs. ly-iyh 
A medium sized species, with RR armed with sharp spines projecting down- 
ward; first IBr cjuadrangular, short; iBr 2 in succession, very elongate, 8- or 
9-sided; IIBr 3 in series, the first very large, the next two narrow and divided 
by an illBr, the third axillary, indicating 4 arms to the ray. Based on the unique 
specimen figured. 
Horizon and locality, same as last. 
CLONOCRINUS Ouenstedt (not Oehlert) 
Plate 7 
Clonocrimis Quensteclt, Petrel. Deutschl., 4, 1876, p. 638 (not Oehlert, 1879). — Bather, Treatise on ZooL, 3, 
1900, p. 162. — Zittel-Eastman, Textb. Pah, 2d ed. 1913, p. 190. — Jaekel, Phylogenie und System, 
1918, p. 32. 
Corymbocrinus Angelin, Icon. Crin. Suecc., 1878, p. 18. — Zittel, Plandb. Pah, 1879, P- 373- — Wachsmuth and 
Springer, Rev. Pah, 3, 1885, p. 106. 
BB 4, hidden by column ; iBr few, one large followed by small ones in 
vertical row ; no anals. Arms dichotomous, biserial below and above the 
bifurcations. 
Genotype. Eucalyptocrinus polydactylus McCoy. 
Distribution. Silurian : Gotland, England, America. 
This genus is regarded as leading from the IMelocrinidae towards the Calyptocrinidae. 
having a similar distribution of the cup plates, but with iBr beyond the first not paired, and 
the arms not resting in compartments between partitions. It is essentially a Gotlandian form, 
of which six species have been described under the name Corymbocrinus. The genus is doubt- 
fully recognized here from some imperfect specimens derived from a formation which has 
produced a number of new and strange forms, one of which is figured. 
Clonocrinus occidentalis new species 
Plate 7, figs. i 8 , i 8 a 
Bias deeply sunken basal cavity, with the small BB at the bottom; and the 
iBr following the first in single vertical succession. 
This may be compared with Corymbocrinus lacvis Ang., pi. 23, fig. 20. 
Horizon and locality. Decatur limestone ; near Perry ville, Tennessee. 
