Archive image from page 300 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( A UDITOR Y AND SO UND-PROD UCING MECHANISMS. 597 chordotonal organ may contain one or many, 10 to 20 or more, auditory rods, forming a fasciculus : when more than one rod is present there is a ganghon in place of a single nerve-cell. The Auditory
Archive image from page 300 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( A UDITOR Y AND SO UND-PROD UCING MECHANISMS. 597 chordotonal organ may contain one or many, 10 to 20 or more, auditory rods, forming a fasciculus : when more than one rod is present there is a ganghon in place of a single nerve-cell. The Auditory rods are minute, more or less fusiform organs, consisting of a body terminating in a long, fine, straight thread, unipolar rods {Mononemadsche Stiftc), or each end of the body may have a rod or thread-like prolongation, when the organ is bipolar (Ainpkineinatische Stiftc). The second prolongation is always distal, and may be represented in the unipolar rods by the short conical point. I have never found primitive chordotonal organs either in the imago or larva of the Blow-fly. Poriferous Chordotonal Organs.—Graber applies this term to certain organs at the bases of the halteres of the Diptera, and Fig. 73.—Three chordotonal end organs, after Graber; A, the quasi-chitinous rod and bulb of the unipolar variety ; B, a group of unipolar end organs, from a larva of Tabanus autumnalis ; C, a bipolar chordotonal end organ, from a Syrphus larva ; cli, head of the auditory rod ; c, pyramidal prolongation in the unipolar variety ; g, ganglion cells ; /, proximal, and /', distal end of the chordo- tonal thread. on the wing nervures of insects. These are essentially chordo- tonal organs, somewhat modified in their minute structure, in which the capitate extremity of the rod is in relation with a thin plate, or pore, in the epidermis, or with the base of a specially modified seta. These will be more minutely described with the halteres (p. 609). The tympanic chordotonal nerve-termina
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