Journal of morphology . i(>.cvos;i. \\-\^. Fig. Diagrams of four consecutive stages in the development of the brainand nerve-chain of the Xiphidium embryo. I, cephalic; II, thoracic; III,abdominal region ; jA, stomodseum ; ««., anus ; e, optic plate ; pc^{), firstprotocerebral lobe, or optic ganglion ; pc^, pc^, second and third protocerebrallobes ; dc, deutocerebrum ; tc, tritocerebrum ; 1-16, the sixteen postoral ganglia ;, postoral commissure ; fp., furcal pit ; ac, anterior; pc, posterior ganglioniccommissure ; ag., anterior ; pg., posterior ; eg., central; Ig., lateral
Journal of morphology . i(>.cvos;i. \\-\^. Fig. Diagrams of four consecutive stages in the development of the brainand nerve-chain of the Xiphidium embryo. I, cephalic; II, thoracic; III,abdominal region ; jA, stomodseum ; ««., anus ; e, optic plate ; pc^{), firstprotocerebral lobe, or optic ganglion ; pc^, pc^, second and third protocerebrallobes ; dc, deutocerebrum ; tc, tritocerebrum ; 1-16, the sixteen postoral ganglia ;, postoral commissure ; fp., furcal pit ; ac, anterior; pc, posterior ganglioniccommissure ; ag., anterior ; pg., posterior ; eg., central; Ig., lateral gangliomeres. The description of the ventral nerve-cord of Xiphidium heregiven applies equally well to the other Orthoptera which I havestudied {Blatta germanica, Melanoplus fcviur-rubriiui). The No. I.] CONTRIBUTION TO INSECT EMBRYOLOGY. 93 points in which the Blattid and Acridian nerve-cord differ fromthat of the Locustid are so insignificant that I need not burdenthe reader with their enumeration. I will stop to mention onlytwo p
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
