CONTENTS 



XXIII. — On [the Jaw and Lingual Dentition of certain Costa Rica 

 Land Shells collected by Dr. William M. Gabb. (With 

 Plate XI.)f By W. G. Bikney 257 



XXIV.— A new Form of Compass-Clinometer. By Lseael C, Bussell. 263 



XXV. — The^Strticinre of Colored Blood Corpuscles. By Lotus, Elsbeeg. 265 



