PLATE XXXII. 



Tripleueoceeas Robsoni (page 281). 



Outline of a cast of the interior of most of the septate portion of the shell 

 of a large specimen of this species from Stonewall, presented by Mr. 

 W. H. Kobson, four-fifths of the natural size. In the original of this 

 figure, twenty-four septal chambers are either wholly or partially pre- 

 served, and the curved sutural lines on the flattened and presumably 

 abdominal side are well shown. 



