362 PALEONTOLOGY OF NEW YORK. 



Spirifkr Newberbti, Hall. 1883. 



(See Report State Oeologrist for 1882, Plate (xxxi) S6, Fig^s. 9, 10). 

 PLATE XXXI, KIGS. 9, 10. 



Shell moderately large, with sharp cardinal angles. Surface plication con- 

 sisting of numerous fine simple or duplicate ribs which cover the median fold. 

 On each lateral slope there are twenty-five to thirty of these plications. The 

 plications and the grooves between them are covered with fine radiating lines. 



Waverly group. Ohio. 



Ctbtia radians, sp. nov. 



PLATES XXV^^, FIGS. 4, 5,80,84; XXXIX, FIG. S3. 



The typical form is of medium size, with high area, incurved umbo and gen- 

 eral cyrtiniform aspect. Its outer surface is characterized by an absence of 

 plications and fine radial striae. Median fold and sinus well developed. 



Clinton group. Rochester, N. Y. 



An allied but larger form, here referred to this species, occurs in the Niagara 

 dolomites, near Milwaukee, Wisconsin. 



Cyrtina umbonata. Hall, var. Alpenensis, var. nov. 



PLATE XXVm, FIGS, lft-20. 



Cyrtina umbonata. Hall, from the original locality in Iowa, is a small shell, 

 often obscurely plicated ; this variety possesses the contour of C. umbonata, but 

 is a larger and more robust shell with broad and well-defined plications, smooth 

 median fold and sinus. 



Hamilton group. Alpena, Michigan. 



Cyrtina lachrymosa, sp. nov. 



PLATE XXVni, FIGS. 86, 87, 47. 



Shells small ; cardinal area high, more or less incurved. Surface with low 

 and rather narrow median fold and sinus, on each side of which are two or three 

 low, faint plications. Lateral margins of the cardinal area broadly rounded. 



