it. 
RIT, 
LV 
CONTENTS. 
No. 3.— December, 1889. 
EpmunpD B. WILson. 
The Embryology of the Earthworm 
Dr. G. Baur. 
On the Morphology of Ribs and the Fate of 
the Actinosts of the Median Fins in Fishes, 
Dr. G. Baur. 
On the Morphology of the Vertebrate-Skull . 
kW. SHUFELDT, M.D, CM.Z.S: 
On the Position of Chameza im the System. 
TyrocrarnHy By J. S. Cusuinc & Co., Boston, U.S.A. 
Presswork sy Ginn & Co., Boston, U.S.A. 
PAGES 
387-462 
463-466 
467-474 
475-502 
