48 Bashford Dean Memorial Volume 



tative both of the typical and of the usual variational segmentations, and reproduce these 

 as two plates. The notebooks contain various fragmentary notes made in America and 

 Japan. Only one, however, contains any data on the cleavage stages, and this informa- 

 tion is contained in two tables labelled ''Segmentation Stages.'' 



Since both notes and drawings of segmentation stages bear no labels other than those 

 referred to above, our first task was to find out it these notes and drawings applied only to 

 Bdellostoma stouti studied in America in 1896 and not to some other species which Dr. 

 Dean might have studied during his visits to Japan in 1899-1900, and also 1905. Among 

 the notes were the two tables already referred to in which the various stages were lettered 

 to correspond with the letters (A, B, C, etc.) on the individual drawings. These figure's 

 we believe to have been made at Monterey Bay from fresh material, or later in New York 

 from eggs fixed and preserved in alcohol. It is, however, possible that Dr. Dean took this 

 Bdellostoma collection with him to Japan, whither he went in 1900 in further search of 

 myxinoid material. At first we thought that some of these drawings might have been 

 made in Japan, from eggs of another species of myxinoid collected there. However, we 

 were subsequently convinced that this view is incorrect and our conclusions are based 

 on the following evidence. 



Dean did get a batch of eggs of the related form Homea hurgeri, but he does not state 

 that this material included embryos. However, he does state that all the other eggs of all 

 the other myxinoids collected in Japan on this trip were taken from the body of the 

 mother. From this and from the fact that fertilization in these fish is external it is clear 

 that Dean obtained no myxinoid embryonic material whatever on this expedition. There- 

 fore we feel entirely justified in declaring our belief that the drawings under consideration 

 were made from the eggs ot Bdellostoma stouti from Monterey Bay, and not from any 

 other myxinoids, from Japan or elsewhere. 



After Dean published the article on Bdellostoyna noted above, his interests spread out 

 into a number of more or less related fields — into a study of the chimaeras (collected on 

 this same trip to Japan) and ot the primitive sharks both fossil and recent. On this same 

 expedition to Japan he obtained much priceless embryonic material from Chlamydoselachus 

 and Cestracion. From these embryos he made many drawings which still remain un- 

 published. Then, too, after his return from Japan he was engaged in teaching embryology 

 in the Department of Zoology in Columbia University and in curatorial work in the 

 Department of Ichthyology and Herpetology in the American Museum of Natural 

 History. Also he was laboring hard in pushing forward the foundational work which 

 eventually produced the great three-volume "Bibliography of Fishes" (1916, 1917, 1923). 

 Furthermore, another and heretofore secondary interest of his many-sided nature awoke — 

 his enthusiastic love for and study of arms and armor. Indeed his interest in such received 

 a great impetus while on this visit to Japan, and he brought back with him what is probably 

 the finest collection of Japanese arms and armor to be found anywhere outside of the Land 

 of the Rising Sun. Thus httle by little he was lured away from fishes and more and more 

 became immersed in the study of armor. This resulted, in 1910, in his being made curator 



