. 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;. Blowflies. THE HEAD AND MOUTH ARMATURE. 45 The Labral Sclerite of the newly-hatched larva (Figs. 7, m, and 9, .', m) articulates by a pair of processes with the anterior inferior processes of the cephalo-pharynx ; these form the edges of the true mouth. The Great Hooks (Fig. 9, j>, h) present three processes : a head which articulates with the hypostom
. 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;. Blowflies. THE HEAD AND MOUTH ARMATURE. 45 The Labral Sclerite of the newly-hatched larva (Figs. 7, m, and 9, .', m) articulates by a pair of processes with the anterior inferior processes of the cephalo-pharynx ; these form the edges of the true mouth. The Great Hooks (Fig. 9, j>, h) present three processes : a head which articulates with the hypostomal sclerite, a coronoid process above, which gives insertion to the retractor muscle, and a discal process below, which is adherent to the centre of the stomal disc. In the adult larva a pair of small sclerites are found lying side by side in front of the crossbar of the hypostomal sclerite ; they are the points of inser- tion for the retractor muscles of the Fig. 9.—I, the cephalo-pharynx and mouth armature of a newly-halched larva; 2, the mouth armature of the same, seen from its ventral surface; 3, the same parts from the adult larva seen in profile ; 4, a diagrammatic section through the thickest part of the cephalo-pharynx ; 5, the head capsule of Precilostola, after Brauer ; 6, the internal head sUcleton of the Cossus larva, after Lyonet—in, median ; h, lateral hooks ; //, pseudo-tracliea;; //, pseudo-labrum and discal sclerites; x, parastomal y, hypostomal, sclerites ; r/, clypcus ; :' and c", Zopf- griiten or ceplialo-phaiyngcal processes ; t\ lateral plate ; ///(, pharyngeal sinus and muscles of the epipharynx. The pharynx (Figs. 8 and 9, 4) lies between the inferior processes of the cephalo-pharynx. In transverse section its cavity appears nearly cre- scentic. The concavity of the crescent is filled by the pharyngeal sinus ; its lower wall is formed by a plate developed in the cuticle of the alimentary tube, the hypopharynx. The upper surface of the
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1890
