EXPLANATION OF PLATE XXXIII. 



Straparollus ammonitiformis, Eth. fil. 



Fig. ] . Upper surface of an internal cast, showing the depressed spire. 



„ 2. Side view of the same specimen, with sectional outline of the 

 younger whorls. 



Keeneia platyschismoides, Eth. fil. 



„ R. Portion of the band of Fig. 1, Plate xxxii., showing the deeply- 

 bent striae — enlarged. 



,, 4 Portion of the band of another and somewhat younger specimen 

 — enlarged. 



,, fi. Portion of the concealed band of the penultimate whorl of yet 

 another example — enlarged. 



