PLATE XIL— Continued. 



Cyclonema? (Plecrotomaria ?) sp. ? 

 Fig. 2*i. The back of a cast. From the Hamilton group, near Leonardsville, Madison county, N. Y. 



Cyclonema lirata. 



Page 35. 

 Figs. 27-29. Tbi-ee indiviiiiiala, cliffering in size, but witli the same character of surface. From tlie Ham- 

 ilton group, Schoharie county, N. Y. 



:ii..r, 1, .iv, 



Cyclonema multilira. 



I'agc 36. 

 Figs. 30, 31. The opposite sides of the typical specimen. Hamilton, N. Y. 

 Figs. 32, 33. Two views of an entire specimen which is somewhat compressed. 



Cyclonema HA.MiLTONiii;; 



Page 37. 

 Fig. 34. A 8j)ecimen preserving the substance of the shell with the entire surface characters. Pratts Falls, 



Onondaga county, N. Y. 

 Fig. 35. A cast showing a greater number of striae. Schoharie county, N. Y. 

 Fig. 36. A si>ecimen showing a line on the flattened portion at the top of the last volution. From the same 



locality. 



Cyclonema obsolescens.* 



Page 38. 

 Fijr. 37. A 1arg«eMt showing the revolving carin® on the upper volutions, but which are scarcely visible 

 , on the body- whorl. 



Cyclonema concinna. 



Page 3S. 

 Pig. 38. An internal cast showing only the upper one of the bands. 

 Fig. 39. A gutta-iiei-cha cast in the natural mold. The specimen shows no carinse on the body- volution, 



except that forming the upper angle, and again at the base of the volution. 

 Fig. 40. Cast of a larger individual, with the entire lower sui-face of the Ixniy-whorl marked by the carinje, 



and only two strong ones on the upper volutions. 



* The specific name of obsoleta, originally given, is preoccupied. 



