ZOOLOGY OF THE R.I. M.S. INVESTIGATOR. 



Molltjsca, Plate XXI. 



la 



2a 



Sa 



4a 



5a 



6 



Qa 



1, la. Pontiothauma minus, Smith, X 2. 



2, 2a. Pontiothauma pacei, Smith. 



3, 3a. Pleurotoma (Surcula) nereis, Smith, X 2. 



Survey of India Offices, Calcutta, 1909. 



4, 4«. Pleurotoma (Surcula) agalma, Smith, X 4. 



5, 5a. Pleurotoma (Bathytoma) urania, Smith, X 3. 



6, 6a. Manaria thurstoni, Smith, X 2. 



