656 Bashford Dean Memorial Volume 



bers that in 1911 Prof. Dean showed him the plate figures of the projected article on the 

 embryology of Heterodontus and remarked that they were made by the best artist (or 

 artists?) available. I do not recall whether he stated that the artists were Japanese, but it 

 seems that some of the drawings bear intrinsic evidence of Japanese handiwork. A foot- 

 note to Dean's article (1901.1) on the "cleavage" of the egg of Heterodontus states that 

 these drawings were made by Messrs. N. Yatsu and I. Kuwabara. hi one of Dean's 

 notebooks there is a table listing embryos of Heterodontus japonicus collected at Misaki, 

 and recording occasional brief data concerning them. In this table there are many 

 entries, in Dean's almost microscopic handwriting, reading ^'Tatsu drawn.'' Whether 

 these drawings were pre limin ary sketches or figures intended for publication is not 

 evident from these records; but on the original of Figure 40, plate VI, there was found, 

 apparently in Dean's handwriting, the word ''Tatsu\ 



After diligent inquiry it appears certain that some, at least, of the plate figures used 

 to illustrate the present article were made by Yatsu, and that part of his work was done in 

 this country. One can readily appreciate the advantages of having the drawings of pre- 

 served material made by one who had seen, and possibly sketched in color, the material in 

 the Hving condition. That all the drawings were not made by the same person seems 

 obvious. Whatever their origin, all who have seen them agree that most of them are 

 remarkably well done. 



WRITTEN RECORDS LEFT BY BASHFORD DEAN 



Dean's notes concerning Heterodontus comprise three documents : First, a notebook 

 containing a list of embryos collected (see also page 654), a very few miscellaneous notes, 

 and a large number of rough sketches of embryos. Some of these sketches are in color, and 

 are presumably made from Hving embryos as a preliminary to more finished portraits of 

 preserved material. Most of these drawings are on pieces of stiff cardboard adhering to 

 the pages of the notebook. Second, there is a notebook from which a considerable number 

 of pages have been cut out and are missing. Of the remaining pages, all are blank except 

 six, and these contain notes relating to the literature of paleontology and comparative 

 anatomy, with special reference to the phylogenetic relationships of Heterodontus. 

 Finally, there is a brief and very incomplete typed manuscript entitled: ''Cestraciont 

 Sharks and their Development." The "Table of Contents" attached to this manuscript 

 reveals that a very comprehensive article, paleontologic, phylogenetic, embryologic and 

 ecologic, was planned. Of this we find, in Dean's manuscript, only an introduction, 

 brief sections dealing with the habits of the fish, methods of collecting its eggs, rate of 

 embryonic development, the egg and its capsule; and a final longer section on "Segmen- 

 tation" or cleavage. Of the 32 pages of this manuscript, 9 are devoted to cleavage. The 

 text here is almost identical with portions of Dean's article entitled "Reminiscence of 

 Holoblastic Cleavage in the Egg of the Shark, Heterodontus (Cestracion) japonicus Mac- 

 leay," pubHshed in 1901. There is intrinsic evidence that the manuscript under con- 

 sideration was v.T:itten at a considerably later date, for in it reference is made to Goodrich's 



