. Report of the Commissioner of Fisheries of Maryland, January, ral view of anterior half of embryo,showing mouth opening, (page 70); and thesemi-circular canals of the ear. In line seven,page 70, Fig. 4, PI. IV, sJiould read Fig. 2, All the other organs of this Fig. arc moreadvanced than in the other figures of this plate. Fig. 3=—Very much enlarged view of anterior end of embryo,viewed nearly ventrally. The ear is nearly en-closed ; and the branchial slits, (page 69,) areformed. Fig. 4—An earlier stage than Fig. 3. Three of the bran-chial slits are formed ; the heart has become
. Report of the Commissioner of Fisheries of Maryland, January, ral view of anterior half of embryo,showing mouth opening, (page 70); and thesemi-circular canals of the ear. In line seven,page 70, Fig. 4, PI. IV, sJiould read Fig. 2, All the other organs of this Fig. arc moreadvanced than in the other figures of this plate. Fig. 3=—Very much enlarged view of anterior end of embryo,viewed nearly ventrally. The ear is nearly en-closed ; and the branchial slits, (page 69,) areformed. Fig. 4—An earlier stage than Fig. 3. Three of the bran-chial slits are formed ; the heart has become htwo-chambered organ, (page G9); and a portionof the vitellus has concentrated into a large oil-sphere in the anterior part of the yolk mass, (page69.) Fig. 6—Posterior end of embryo. The portion under thenotochord is splitting into two tracts, in whichthe great blood-vessels will soon be formed, (page70.) Fig. G—Section of embryo in the anal region. The twotracts of Fig. 5 are seen, a and b, also the poste-rior end of the intestine, c, (page 70.) PLATE ! PLATE V. [Tiic figures represented in this Plate ?\vcre from hatched spccimcus, andwere, excepting the adult forms, f»bout tbrcc-sixteonths of an inc!i in length.] Kigs. 1 and 2—Profile and dorsal views of recently hatchedRraelt. All the organs already described can bemade out in ptill more a^lvanced condition, (patje 71.;) Fig. 3—Diagram of first blood-system of young Smelt,(page V3.) The first and third pairs of branchialvessels are not represented in the diagram, sincethey are often, if not always, formed at a laterperiod. Fig. 4—^ery much enlarged view of young Smelt, at a pe-riod a little later than represented in Fig. 1,(page 72.) Fig. 5—Head of Smelt at time of first blood-system, (page72.) Figs. 6 and 7—Views of fast disappearing yolk. The largeoil-sphere is in the centre of the mass, is becom-ing very much smaller, and has turned of a brownish-yellow color. Fig. 8—Profile view of adult female
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