BRITISH MUSEUM (NATURAL HISTORY). 



BRITISH ANTARCTIC ("TERRA NOVA") EXPEDITION, 1910. 



NATURAL HISTORY REPORT. 



ZOOLOGY. VOL. II, No. 9. Pp. 203-232. 



MOLLUSCA. 



PART III. EUPTEROPODA (PTEROPODA THECOSOMATA) AND 

 PTEROTA (PTEROPODA GYMNOSOMATA). 



BY 



ANNE L. MASSY. 



WITH NINE FIGURES IN THE TEXT. 



, LONDON : 



PRINTED BY ORDER OF THE TRUSTEES OF THE BRITISH MUSEUM. 



Sold by LONGMANS, GBEBN & Co., 39, Paternoster Bow, E.G. 4; B. QCARITCH, LTD., 11, Grafton Street, New Bond 

 Street, W. 1 ; DCLAO & Co., LTD., 34-36, Margaret Street, Cavendish Square, \V. 1 ; 



AND AT THE 



BRITISH MDSEDM (NATURAL HISTORY), Cromwell Road, London, S.W. 7. 



1920. 

 [All rights reserved.] 



Price Seven Shillings and Sixpence. 



[Issued 26th June, 1920.] 



