. Bulletin of the Essex Institute . es considerably from that of other ob-servers on the early stages of decapods. For instance,Keichenbach (86) describes the mandibles as the firstappendages to appear and then the antennulse and lastlythe antennae,^ thus arriving at the so-called naupliusstage. Like myself (c/, 86, pi. lia, fig. 7a, Z6 et^^EIV) he has all the appendages at first distinctly postoral,while he does not find that the mouth is distinctly behindthe antennae until a stage (his G^) comparable to mystage E, This primitively postoral position of all thecrustacean appendages has now bee
. Bulletin of the Essex Institute . es considerably from that of other ob-servers on the early stages of decapods. For instance,Keichenbach (86) describes the mandibles as the firstappendages to appear and then the antennulse and lastlythe antennae,^ thus arriving at the so-called naupliusstage. Like myself (c/, 86, pi. lia, fig. 7a, Z6 et^^EIV) he has all the appendages at first distinctly postoral,while he does not find that the mouth is distinctly behindthe antennae until a stage (his G^) comparable to mystage E, This primitively postoral position of all thecrustacean appendages has now been too firmly settled toadmit of dispute. Ishikawa has the mandibles appearfirst in Atyephyra, but this, as explained above is, I think,a mistake. There is one feature in the history which has alreadybeen detailed to which attention should be called. A com- iReicheubach regards the ophthalmic stalk as an appendage homonomouswith the rest, hence there is a discrepancy of one in the nomenclature of ourplates. 13 IXST. Kin^l«y, del VolXVIII PlLbulletinofess181886unse
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