EXPLANATION OP PLATE XLVIII. 



Nautilus Cookana Whitf. (p. 285). 



Pig. 1. View of a large specimen which has been obliquely compressed. A portion of the coll has 



been removed to show the inner volution, cast of the umbilicus, etc. The wood-cut out- 

 line on page 286 is of the opposite side of this specimen. 

 394 



