PLATE 14. 



Page 

 Pig. 1 a - h. NUCLEOSPIRA VENTRIC08A. 220 



1 a, b, c. Individuals of small size. 

 1 d, e. Casts of larger forms. 

 If; g, h. Specimens of large size. 

 The figures 1 i - o are of Meeistella. See M. bella. 



Fig. 2 a - /. Orthis strophomenoides. 177 



2 a, b, c. The ventral valves of several specimens which are more or less exfoliated, so tliat 

 the surface characters are not fully preserved. 



2 d, e. Casts of the ventral valve, showing the muscular and vascular impressions. 



2/. Profile of a dorsal valve from which the shell is partially exfoliated. 



2 g, h. Two specimens of the dorsal valve, showing the muscular and vascular impressions. 



2 i. Enlargement of the muscular and vascular impressions, cavities of cardinal and brachial 

 processes, etc. of part of a dorsal valve. 



2 fc. A farther enlargement of one side of the cast of a dorsal valve. 



2 /. Enlargement of tlic stria;, showing in the depressions some fine concentric stria;. 



