Archive image from page 104 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; CUbiodiversity4765349-9885 Year: 1890 ( THE JMAGIN A L DISCS. 83 Kunckel d'Herculais [25] figured and described three pairs of appendicular discs in the resting larva of Volucelia—a pair of mandibular, a pair of maxillary, and a pair of labial discs. The two latter correspond with those
Archive image from page 104 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; CUbiodiversity4765349-9885 Year: 1890 ( THE JMAGIN A L DISCS. 83 Kunckel d'Herculais [25] figured and described three pairs of appendicular discs in the resting larva of Volucelia—a pair of mandibular, a pair of maxillary, and a pair of labial discs. The two latter correspond with those of the Blow-fly larva, but I have been unable to find any traces of mandibular discs. Weismann knew nothing of the appendicular head discs. The Thoracic Discs are arranged in two groups. Four neural discs attached to the second and third pairs of nerves lie beneath the neuroblast and the great cephalic discs. These are the inferior, pro- and mesothoracic discs. Four pairs are closely related to the great tracheal trunks, the upper pro-, meso- and metathoracic, and the inferior metathoracic discs (Fig. 16). Fig. 15.—Leg Disc, neck of sac ; c, nerve after traversing mesoblast of the disc; m, mesoblast; .f, sac of disc ; /;, hypoderm ; tr, trachew. The inferior thoracic discs may be called for brevity leg discs. The prothoracic pair are enclosed in a single sac, and are connected with the hypodermis by two distinct necks (Fig- 15. I b), and with the neuroblast by a pair of nerves. The mesothoracic leg discs are not united ; they lie below and a little behind the prothoracic discs. The concentric structure which the leg discs exhibit in optical section is due to the arrangement of the epiblast (Fig. 15). The central papilla is the rudiment of the last tarsal joint, and 6—2
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