. The Arthrostraca of Connecticut. Malacostraca. No. 26.] ARTHROSTRACA OF CONNECTICUT. 27 ized processes of the integument, whose exact functions are still largely conjectural. When a foreign chemical substance is placed in a vessel containing Amphipoda, the antennae are waved vigor- ously, which may point towards the conclusion that on these appendages are smelling or tasting organs. The delicate thread- like setse noted frequently on the principal flagellum of the first pair of antennae are called olfactory hairs. The calceoli, which occur in forms like Calliopius, are conical vesicles attac
. The Arthrostraca of Connecticut. Malacostraca. No. 26.] ARTHROSTRACA OF CONNECTICUT. 27 ized processes of the integument, whose exact functions are still largely conjectural. When a foreign chemical substance is placed in a vessel containing Amphipoda, the antennae are waved vigor- ously, which may point towards the conclusion that on these appendages are smelling or tasting organs. The delicate thread- like setse noted frequently on the principal flagellum of the first pair of antennae are called olfactory hairs. The calceoli, which occur in forms like Calliopius, are conical vesicles attached by their apices to the general surface of the skin. They have been called by Leydig " slipper-shaped " structures, but with greater propriety they might be compared to wine glasses. Their func- tion is wholly unknown. Internal Anatomy. The nervous system consists of twO' symmetrical ganglionic chains, united at intervals by commissures, and lying on the pottenoraaia. Fig. 2. Internal Anatomy, after Stebbing. ventral side of the alimentary canal, except at the extreme ante- rior end, where the ganglia are on the dorsal side (Fig. 2). The supraesophageal mass is made up of two halves, separated by a deep median groove, and consists of two large cerebral lobes, as well as a pair of ganglia, which give rise to the optic nerves, and another pair giving rise to the antennal nerves. Beneath the esophagus and connected with the brain by commissures around it, lies the subesophageal mass, which gives ofif nerves to the mouth parts, and represents the consolidated ganglia of the segments to which the mouth parts belong. The sub- esophageal ganglia are continuous posteriorly with the sub- intestinal ganglionic chain. This consists of a pair of ganglia,. 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 Kunk
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmalacostraca, bookyea
