So imich lias been written upon the anatomy and development of this fish by eminent authorities that I approach the subject with a certain hesitancy. The development of the skull has been elaborately worked out by W. Kitchen Parker. The skeleton of the adult has been figured in great detail by Bruch in a magnificent monograph, while the general development has been repeatedly discussed by investigators during the last century with more or less thoroughness. Notwithstanding this, it may be truly

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... said that our knowledge of the exact details of some features of its development is still imperfect, even though such able euibryologists as OEllacher, Balfour, His, Hoffmann, and Ziegler have devoted considerable attention to it and its allies within a i^eriod extending over scarcely more than the past decade. The early stages of development have been investigated by OEllacher, His, and Ziegler, with such opportunities that can only be enjoyed by one who is near a locality where the spawning or oviposition of the adults is in progress. I can therefore add nothing to the information given us by those writers, but all that will concern us at present is the arrangement of the blood-vascular system at the time of hatching, some of the impairments which this system suffers when the youug fishes are under the care of the fish-culturist, and the development of the fins. The material used in this investigation consisted of recently-hatched embryos of the land-locked salmon, Salmosalar, var. sebago. I have carefully drawn a live specimen several times enlarged by the help of the camera lucida, as represented in Fig. 1 , in order especially to show the arrangement of the vessels on the vitellus, the distribution of the rose-colored oil drops in the latter, and the vessels and venous sinus in the tail.