9 -ON THE VIVIPAROUS FISHES OF THE PACIFIC COAST OF NORTH 
AMERICA. 
BY CARL H. EIGENMANN, 
Professor of Zoology, Indiana University. 
INTRODUCTION. 
During a stay of nearly three years on the coast of California at San Francisco 
and San Diego, viviparous fishes were daily seen in the markets and a large amount of 
material illustrating their development was collected. Few adult specimens of Embio- 
tocidce were preserved, since they were already well represented in most museums. The 
revision of this family is largely based on collections made by Drs. Jordan and Gilbert. 
Of the Scorpcenidae, more specimens were collected, since many new forms were discov- 
ered. On the other hand, the embryology of this family is of much less interest than 
that of the Embiotocidce, in which among teleosts viviparity has been carried to the 
greatest extreme. 
The present paper gives a review of the E mbiotocidce, a bibliography of the 
viviparous fishes, and a detailed account, as far as my material permits, of the develop- 
ment of Cymatogaster from fertilization to hatching and the details of the development 
of the intestine and of Kupffer’s vesicle. Outlines of the postembryonic development 
are also presented, but the details of the anatomy of the various postembryonic stages 
will be reserved for a future paper. 
It is the intention of the writer to complete as rapidly as possible the following 
additional chapters: The development of the skeleton; the circulatory system, and 
especially the development of the sexual organs from the time of the segregation of 
the sex cells till sexual maturity (for which practically all the necessary material has 
been collected) ; and a revision of the Scorpcenidce. Several of these chapters have 
been sketched out and many of the drawings for them have been prepared. 
Points in the embryology of Cymatogaster , which, on account of the scarcity of 
material have not been made out as fully as desired, are, the first formation of the 
embryo, its relation to the blastopore, and the development from the closing of the 
blastopore till three protovertebrse are completed. I have given full particulars as to 
when and where eggs are to be obtained with the hope that others will fill these gaps. 
I am indebted to the San Francisco Microscopical Society for the use of its library 
and for many other courtesies. I am under many obligations to Dr. Theodore Gill, 
of the Smithsonian Institution. Several years ago he showed me an unpublished and 
abandoned work on west coast fishes, which, among other things, contained the various 
accounts of the early observers on the viviparity of Embiotoeidce. When, later, I was 
preparing the historical portion of this paper, Dr. Gill sent me the whole of this mate- 
rial so far as it related to the Embiotoeidce as well as all of his manuscript notes, 
accompanied by the following remarks: “Make such use of them as you wish and 
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