\ 



VOL. XXXVII, NO. 437 



May, igo3 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



, Partial Albinism and Folychromism in Hag-Fishes 



BASHFOED DEAN 295 



H. Variation in Lithobius forficatus Dr. S. E. WILLIAMS 299 



IH. On the Morphological and Physiological Classification of the Cutaneous Sen.- 



Organs of Fishes 



IV. The Compound Eyes of Machilis . . . • 

 V. Synopsis of North American Invertebrates. XIV. Part IV. The Scyphomedus^ 



Professor C. W. HAEGITT 331 

 ure . General Biology, Development and Evolution, Biologi- 347 



>ssor C. J. HEEEICK 313 

 FEANCIS SEATON 319 



VI. Notes and Literatui 



cal Laboratory Methods — zoology, o«u«u , -»~ 



VII. Correspondence • ■ • 



Vm. Quarterly Eecord of Gifts, Appoint 



BOSTON, U. S. A. 



GINN & COMPANY, PUBLISHERS 



