March 30. Price 3s. 



THE JOURNAL 



OF 



THE LINNEAN SOCIETY. 



Vol. XV. ZOOLOGY. No. 81. 



Page 



CONTENTS.^ v Ag^> 



s of the President\Jh , of. . 



I. Anniversary Address of the President\prof. Allman, 

 M.D., LL.D., E.R.S. — Some Eecent Additions to our 

 Knowledge of the Structure of the Marine Polyzoa... 1 



II. On the Thorax of the Blow-fly (Musca vomitoria). By 



Arthur Hammond, E.L.S. ( Plates I. & II.) 9 



III. Instincts and Emotions in Eish. By Francis Day, 



F.L.S 31 



IV. On the Extinct Land-Tortoises of Mauritius and Rodri- 



guez. By Alfred C. H addon, B.A., Scholar of 

 Christ's College, and Curator in the Museum of Zoo- 

 logy and Comparative Anatomy of the University of 

 Cambridge. (Communicated by Prof. A. Newton, 

 ' E.R.S.) (Abstract.) '.. 58 



V. On a small Collection of Crustacea made by Edward 

 Whymper, Esq., chiefly in the N. Greenland Seas ; with 

 an Appendix on additional Species collected by the 

 late British Arctic Expedition. By Edward J. Miers, 

 E.L.S. &c 59 



LONDON: 



SOLD AT THE SOCIETY'S APARTMENTS, BUKLINGTON HOUSE 



AND BY 



LONGMANS, GREEN, READER, AND DYER, 



AND 



WILLIAMS AND NORGATE. 



1880. 



