. A contribution to insect embryology. Insects. No. I.] CONTRIBUTION TO INSECT EMBRYOLOGY. 33 connection with the hypodermis. In a little later stage than the one here described the columella and the conical lump of inner indusial elements have disintegrated, and can no longer be distinguished from the granular amniotic serum. The changes in the configuration of the embryo since its arrival on the ventral yolk, relate mostly to the appendages. At first the antennae are of about the same thickness as the. Fig. IV. Sagittal section through the anterior pole of a Xiphidium embryo, with pig- mente
. A contribution to insect embryology. Insects. No. I.] CONTRIBUTION TO INSECT EMBRYOLOGY. 33 connection with the hypodermis. In a little later stage than the one here described the columella and the conical lump of inner indusial elements have disintegrated, and can no longer be distinguished from the granular amniotic serum. The changes in the configuration of the embryo since its arrival on the ventral yolk, relate mostly to the appendages. At first the antennae are of about the same thickness as the. Fig. IV. Sagittal section through the anterior pole of a Xiphidium embryo, with pig- mented eyes, ch., chorion ; cL, columella ; sr. c, Blastodermhaut; sr., serosa ; ind^ + am., remains of the inner indusium and amnion ; ind^, outer indusium • itid^ s., secretion of the inner indusium; am. s., amniotic secretion; /v. c^, first larval cuticle ; /v. c', second larval cuticle ; dr., brain ; e., eye. legs. The dark line running parallel with their inner edges, and distinctly marked in Fig. 9, is in section seen to be a meso- dermal partition dividing the cavity of the appendage into two tubular sinuses. The antennae grow directly tailward till their tips reach the femorotibial joint of the hind legs, when they di- verge laterally, describe an arc, and then grow forward. When the tips have reached the head further progress is arrested. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wheeler, William Morton, 1865-1937. Boston : Ginn & Company
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
