. Carnegie Institution of Washington publication. riun'osTi'.cnxfl!. 207 being 465 mm. At the hinder end ot the symphysis its depth is 110 mm., and the width of the jaw, 155 mm. On the under surface the symphysial end of the jaw turns strongly upward, but the upper surface rises little. Wieland found the splenial to be present. Wieland has described 5 cervical vertebra; (tig. 266, cer. v) which belonged to the type specimen (Amer. [our. Sci., 11, p. 401; xiv, p. 102). These centra indicate a neck of great strength. The centrum of one, regarded as the third or the fourth, is procoelous, 95 mm.
. Carnegie Institution of Washington publication. riun'osTi'.cnxfl!. 207 being 465 mm. At the hinder end ot the symphysis its depth is 110 mm., and the width of the jaw, 155 mm. On the under surface the symphysial end of the jaw turns strongly upward, but the upper surface rises little. Wieland found the splenial to be present. Wieland has described 5 cervical vertebra; (tig. 266, cer. v) which belonged to the type specimen (Amer. [our. Sci., 11, p. 401; xiv, p. 102). These centra indicate a neck of great strength. The centrum of one, regarded as the third or the fourth, is procoelous, 95 mm. long and 140 mm. wide. Dorsal, sacral, and caudal vertebrae also are described by the same author. The shoulder-girdle of the type specimen was described by Wieland (Amer. Jour. Sci., 11, p. 404). The scapula (fig. 266, scap) is a stout and heavy bone, resembling that of Pro- tostega. The length of the body ot this bone, from the upper end to the glenoid fossa, is 450 mm. The coracoid (fig. 266, cor) is elongated and slender, as in Protostega. The length is 650 mm., the width of the distal end, 127 -j em. FlG. 267.—Archelon ischyros. Limb bones. Xi's. fern', left femur, dorsal surface; jem", left femur, tibial border; /em'", proximal end of left femur, fibular border ; fib, fibula ; hum, left humerus; rad, ulna ; tib, tibia ; ul, radius. The bones marked rad and ul should exchange places, be placed with the other ends up, and exchange explanatory letters. The humerus figs. 266, 267, hum) is an enormous bone, the length from the head being 580 mm.; the total length, 650 mm. The width of the distal end is 340 mm. This bone differs from that ot Protostega 111 having a relatively smaller head and the radial process much reduced. Wieland describes also the radius, the ulna, and some phalangeal bones. The figures by Wieland are here reproduced. In the figure of the fore limb the upper ends of the ulna and 1 In radius have mistakenly been represented as the lower. Whe
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