M PALAEONTOLOGY OF NEW YORK. 



carinate ridges, of which two or three are visible on the upper volutions, 

 and about five on the body-whorl ; those on the upper side of the volu- 

 tion more distant than those on the lower side. 

 Scrfacb marked by fine, closely arranged striae of growth, which are sometimes 

 crowded in fasciculi, giving gentle inequalities; these striae are directed 

 a little backward from the suture. 



The larger specimens are about an inch in diameter, with a height about 

 one-fourth greater. The prevailing forms are about three-fourths of an inch 

 high. 



Formations and localities. In the coarse sandy shales of the Hamilton group, 

 in Chenango and Madison counties, N. Y. 



Cyclonema multilira. 



PLATE XII, FIGS. 30-33. 



Cyclonema multilira, Hall. Descriptions of New Species of Fossils, etc., p. 20. 1861. 



" Fifteenth Rep. N.Y. State Cab. Nat. Hist., p. 48, pi. 5, fig. 17. 1862. 

 " " " Illustrations of Devonian Fossils : Gasteropoda, pi. 12. 1876. 



Shell turbinate, ventricose. Volutions five or more ; body -whorl very large 

 and extremely ventricose, — its surface marked by fine concentric striae 

 of growth, which are directed backwards from the suture toward the 

 periphery, and pass to the lower side of the volution without deviation, 

 except in the slight undulation at the crossing of the revolving carinae. 



Surface of the volutions marked by strong, elevated, revolving lines or carinae, 

 of which there are about five or six upon the upper ones, and ten or 

 twelve on the body-whorl ; the space from the suture to the upper of 

 these lines is greater than between the lines, those of the periphery being 

 more closely arranged than those above or below. 



This species is similar in form to C. lirata, with the last volution more ven- 

 tricose, and all the volutions less angular; the revolving carinate lines are 

 twice as numerous and not so strong. It is intermediate between the C. Ham- 



