164 SMITHSONIAN INSTITUTION 



third as high as wide; IIBr 4 or 3, with one more bifurcation visible. Arms 

 infolding at about the sixth III Br, equally dividing and closely abutting. Anal 

 x large, acuminate, reaching to IIBr 2 . RA under r. post. R, but rather small, 

 and not touching r. ant. R. iBr not so large as in A. interradiatus. Column 

 large, composed of uniformly large rounded columnals without alternation near 

 the calyx. 



Miller and Gurley described this species as a Lecanocrimis from a single specimen. 

 Neither their figures nor description show the presence of a radianal, yet it is plain in the 

 type specimen (PL X, fig. 8). The form lacks the ventricose calyx of the two preceding 

 species, and is of decidedly more elongate and slender habitus, more so than is.indicated by 

 the figure, as the specimen is somewhat flattened. The type is derived from the Niagaran 

 limestone near Louisville, Kentucky, and I figure another specimen, from a slightly lower 

 horizon in western Tennessee, which may be of this species, being about the same size and 

 quite elongate, with the same conical inf rabasal ring ; it is too much distorted for close com- 

 parison. No other specimens are known. 



Type. In the Walker Museum, University of Chicago ; the original of figure 9 is in the 

 author's collection. 



Horizon and locality. Silurian, Niagaran, Louisville and Brownsport limestones; 

 Louisville, Kentucky, and Decatur County, Tennessee. 



Anisocrinus oswegoensis (Miller and Gurley) 

 Plate X, figs, ja, b, c 



Lecanocrimis oswegoensis Miller and Gurley, Bull. 4, Illinois St. Mus., 1894, p. S3, p'- 3. figs. 15-17. 

 Anisocrinus oswegoensis, Springer, Jour. Geology, XIV, 1906, p. 480, pi. 6, fig. 12. 



A small species. Crown elongate, obconic below, gradually expanding to 

 greatest width about I Ax, where height to width is 1.1 to i ; at RR, 1 to 3; base 

 truncate. Surface marked by small raised pustules. Crown, 14 mm. high by 

 8 mm. wide. 



IBB of medium size, protuberant, continuous with column and not forming 

 a rim. BB smaller than radials. RA large, directly under r. post. R, touching 

 r. ant. R, and of similar form to radials. Anal x obtusely angular above and 

 followed by two unequal plates, with probably others succeeding. iBr two, 

 small, in vertical series. RR large; B to R to IBr, 2.7:3.2: 1.5. IBr half as high 

 as wide. IIBr 4 or 3, with at least one bifurcation above. Column unknown. 



This species, which is represented by only a single specimen from the Niagaran lime- 

 stone of Oswego, Illinois, differs from all others in the perfectly primitive position of the 

 radianal, and in the presence of more than one plate in the anal and interbrachial areas. The 

 specimen is somewhat injured ; there is an open space in the anal area, but I have no doubt it 

 was filled with plates. The iBr plates taken together are much smaller than the single one of 

 the Swedish species, and there is no such swelling of the calyx as is seen in them. The IBr 

 are proportionately wider plates. This is the only species in which a surface ornament has 

 been observed. 



Type. In the Walker Museum, University of Chicago. 



Horizon and locality. Silurian, Maquoketa ; Oswego, Illinois. 



