. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 108 COMPARATIVE ANATOMY deles and certain Anura—, Bombinator, Fig. 43, C), or else their free edges come into apposition and fuse together (other Anura, , Rana, see Fig. 48, D). In Anurans the procoracoids have a more transverse position than in XJrodeles, and come into xW. Fig. 85b.—Pectoral Abch or the Right Side of Scdamandra maculosa, considerably magnified, and flattened out. iS'<S', supra-scapula; S, scapula (ossified); Co, coracoid ; CI, procoracoid; a, h. bony processes extending into the procoracoid
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 108 COMPARATIVE ANATOMY deles and certain Anura—, Bombinator, Fig. 43, C), or else their free edges come into apposition and fuse together (other Anura, , Rana, see Fig. 48, D). In Anurans the procoracoids have a more transverse position than in XJrodeles, and come into xW. Fig. 85b.—Pectoral Abch or the Right Side of Scdamandra maculosa, considerably magnified, and flattened out. iS'<S', supra-scapula; S, scapula (ossified); Co, coracoid ; CI, procoracoid; a, h. bony processes extending into the procoracoid and coracoid respectively; 6', glenoid cavity, surrounded by a rim of cartilage (L). connection with the coracoid in the mid-ventral line, thus giving rise to a fenestra between the two. The whole arch is, moreover, more strongly ossified, the procoracoid being covered by an invest- ing bone—the clavicle. Reptilia.—In Reptiles the ossification is still more marked. The simplest condition of the shoulder-girdle is seen in Chelonians (Fig. 86), in which its similarity to that of Amphibians as well as to that of Hatteria is at once seen : no clavicle is developed. In other Reptiles the same general plan is retained with modifications. Thus in Lizards (Fig. 44) the well- developed clavicle is more indepen- dent of the rest of the arch and becomes ossified directly, forming a delicate secondary bony lamella ex- tending from the scapula to the apex of the episternal apparatus. But it must be remembered that the un- differentiated cells of which it at first consists are in direct continuity with those which form the scapula. Unossified spaces are left in the coracoid, giving. 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 Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
Size: 1489px × 1677px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
