THE DEVELOPMENT OE SYxMBRANCHUS MARMORA'L'US. 1 
The Development of Symbranchus 
marmoratus. 
By 
yioiiiea Taylor, S.N.D., B.Sc. 
With Plates 1 — 4 and 4 Text-figs. 
Contents. 
PAGE 
I. Introduction . . . . . 1 
II. G-eneral Sketch of Development . . .4 
III. Development of Certain Systems of Organs . 20 
(a) Alimentary Canal . . . .20 
(b) Renal Organs . . . . .30 
(c) Vascular System . . . .34 
(d) Nervous System . . . .42 
IV. Summary . . . . . .45 
V. Explanation of Plates . . . .49 
I. Introduction. 
The Symbrancliii are a small group of eel-like fishes which 
are generally placed near the Apodes in recent systems of 
classification^ though lack of sufficient anatomical description 
and embryological material has made it difficult to determine 
exactly their affinities. Tate Regan^ in his “ Anatomy and 
Classification of the Symbranchoid Eels’^ (9), derives them from 
the Acanthopterous pliysoclists. Tlie embryology of a Sym- 
brancliid lias^ up till now, not been investigated. 
The following account deals with the South American 
species, Symbranchus marmoratus, which long ago 
VOL. 59, PART 1- — NEW SERIES. 1 
