. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . Fig. MECISTOPS INTERMEDIUS. Limbs ambulatory, no third trochanter. Sacrum of two vertebra3. No procoracoid or clavicle. Ribs mostly double-headed. External nostrils anterior. Pubes longitudinal, not entering acetabulum ; free distally. Zygapophyses only; chevron bones ambulatory; a third trochanter on femur. Sacrum of two or three vertebra?; acetabulum entire; pubes united. Ribs double-headed. External nostrils posterior. Zygapophyses only and chevron bones. THECODONTIA. Limbs ambulatory or prehensil
. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . Fig. MECISTOPS INTERMEDIUS. Limbs ambulatory, no third trochanter. Sacrum of two vertebra3. No procoracoid or clavicle. Ribs mostly double-headed. External nostrils anterior. Pubes longitudinal, not entering acetabulum ; free distally. Zygapophyses only; chevron bones ambulatory; a third trochanter on femur. Sacrum of two or three vertebra?; acetabulum entire; pubes united. Ribs double-headed. External nostrils posterior. Zygapophyses only and chevron bones. THECODONTIA. Limbs ambulatory or prehensile. Ilium horizontal, supporting a long sacrum of five or six vertebrae, the anterior derived from the lumbar acetabulum thrown forwards, and not complete, but perforate. AND AVBS OF NORTH AMERICA. 33 Ischium long longitudinal, posterior, supporting the pubis in front on a process. Ribs free, double headed. Neural arches united by suture; chevron bones present. DINOSAURIA. Limbs ambulatory. External nostrils anterior. Inferior pelvic elements in contact transversely,
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Keywords: ., bo, bookcentury1800, bookdecade1860, bookidsynopsisofextinc00cope
