Archive image from page 51 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 ( 38 THE LARVA OF THE BLOW-FLY. distal joint (Figs. 4 and 5). The distal portion is sub- hemispherical and has two short conical sensory papillae at its extremity, one above the other ; it contains a pair of sensory organs, which terminate in the pap
Archive image from page 51 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 ( 38 THE LARVA OF THE BLOW-FLY. distal joint (Figs. 4 and 5). The distal portion is sub- hemispherical and has two short conical sensory papillae at its extremity, one above the other ; it contains a pair of sensory organs, which terminate in the papillae. These closely resemble the eyes of a leech, except in being devoid of pigment; they are apparently sensitive to light (see Sensory organs). The proximal portion is sub-cylindrical, and exhibits a very remarkable half-disc on its ventral and outer surface, the stomal disc (mihi), and in front of the stomal disc the orifice of a sac, in which the great hook lies when retracted. oTiS® c Fig. 5.—a, the head and mouth of the idult hr\i tf the Ijlow-Fly seen from the ventral surface ; 3, Newport's segment ; 4, the segment ; b, the mouth more highly magnified (i inch objective) ; /, the prestomal sclerite ; ii, the stomal disc ; ni, aperture of the mouth ; //', the labium ; c, transverse sec- tion of the pseudo-trachea; of the stomal disc as seen with ,',t oil immersion lens. The real significance of these organs has been apparently overlooked by Weismann and most subsequent writers, except Macloskie and perhaps Brauer [14, p. 32], who recognised that the mouth parts of the larva correspond with the proboscis of the imago, without entering into details. This is more remark- able, as the development of the maxillae is easily traced from the unmistakable maxillae of the embryo, from which they scarcely differ, and these were correctly figured and described by Weismann, who, however, entirely neglected the correspond- See page 44.
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