CONTENTS OF VOLUME XVII. 



No. I. — September, igoo. 



PAGES 



I. GusTAv EisEN, Ph.D. 



The Spermatogenesis of Bairachoseps . . . 1-117 



II. R. W. Shufeldt, M.D. 



Professor Collett on the Morphology of the 

 Cranium ajid the Anricidar Openings in 

 the North-European Species of the Family 

 Strigidce 1 19-176 



No. 2. — June, 1901. 



. I. Edith M. Brace. 



Notes on Aeolosoma Tenebrarnm .... 177-184 



II. Howard Ayers and C. M. Jackson. 



Morphology of the Myxinoidei. I. Skeleton 

 and Musculature 185-226 



III. Frank R. Lillie. 



The Organization of the Egg of Unio, based 

 on a Study of its Maturation, Fertilization, 

 and Cleavage 227-292 



IV. Helen Dean King. 



The ATatnration and Fertilization of the Egg 

 of Bifo Lentiginosus 293-350 



