59 



b. Demonstration of mitotic figures and centrosome in gas- 

 ti^opod ova. Exhibited by H. E. Crampton, Jr., Colum- 

 bia University. 



c. Spermatogenesis of A77iphiuma. Exhibited by J. H. 

 McGregor, Columbia University. 



I. Double spiremes of reproductive cells. 

 3. Double-stained spermatids. 



d. Preparations illustrating the formation of tetrads in 

 Anasa tristis. Exhibited by F. C. Paulmier, Columbia 

 University. 



e. Early stages in the development of the catfish, Amturus^ 

 showing relation of blastoderm to yolk. Exhibited by 



F. B. Sumner, Columbia University. 

 Collections from the Pacific Coast made by Colum- 

 bia University Expedition of 1S96. 



a. Egg cases and eggs of Chimcera colliei. A shark-like 

 fish representing the sub-class Holocephali. This group 

 is a particularly interesting one palaeontologically, and it 

 is hoped that the developmental study of one of its few 

 living representatives may throw some more definite light 

 upon its kinships. Some of these embryonic stages have, 

 for the first time, been collected (near Monterey, Cal.,) 

 and are exhibited by Bashford Dean. 



b. Adult and L,ar\a\ C/iimcsra co^h'ei. Exhibited by Bash- 

 ford Dean. 



c. Strings of Eggs of the Calif ornian Myxinoid, Bdellostoma 

 stouti. 



d. Embryos of Bdellostotna. 



e. Ovaries of Bdellostofna. 

 f. Adult Bdellostoma. 



The Myxinoid division of the sub class Marsipo- 

 branchii^ Lampreys and Hags, is as yet but little studied 

 developmentally ; the only embryos hitherto collected, 

 the present excepted, were taken near Monterey by Prof. 



G. C. Price, of the Leland Stanford University. Collected 

 near Monterey, Cal. Exhibited by Bashford Dean. 



