Explanation of Plate. 



Fig. i. Murex nuttingi Dall (drawn from specimen 107,372, U. S. Nat. 

 Mus.) Height of shell 56 mm.; page 13. 



Fig. 2. Cerion niteloides Dall (drawn from specimen 107,411, U. S. 

 Nat. Mus.); height of shell 28 mm. ; page 15. 



Fig. 3. Liotia centrifuga Dall drawn from specimen 107,419, U. S. 

 Nat. Mus.); height of shell 3.5 mm.; page 16. 



Fig. 4. Carditella smithii Dall (drawn from specimen 107,365, U. S. 

 Nat. Mus.) Height of specimen 2 mm.; page 16. 



