. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MONOTREMATA. 379 transversely, convex vertically, in the Echidna; it is hardly definable when the cartilage is separated from the bone ; but the patella itself is well developed, and ossified in both Mono- tremes (Jig. 173, A, p). The tibia is straight in the Echidna, but bent, with the convexity next the fibula, in the Ornithorhynchus; its cristre are slightly marked. Thejibula is slightly bent in the Echidna, but is straight in the Ornithorhynchus ; in both Monotremes it is longer than the tibia by the extent of a proc
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MONOTREMATA. 379 transversely, convex vertically, in the Echidna; it is hardly definable when the cartilage is separated from the bone ; but the patella itself is well developed, and ossified in both Mono- tremes (Jig. 173, A, p). The tibia is straight in the Echidna, but bent, with the convexity next the fibula, in the Ornithorhynchus; its cristre are slightly marked. Thejibula is slightly bent in the Echidna, but is straight in the Ornithorhynchus ; in both Monotremes it is longer than the tibia by the extent of a process which rises upwards beyond the proximal articulation of the fibula, and most strongly expresses the analogy of this bone with the ulna: this process (Jig.\73, A, t>) reaches half way up the back of the femur in the Ornithorhynchus, and, like the olecranon, is greatly expanded at its termination. Cuvier* indicates the resemblance of this structure in the Monotremes with the fibula and the super- numerary bone imposed upon its enlarged prox- imal end in the pedimanous Marsupials. The tarsus (Jigs. 178, 179) consists of a scaphoid («)> astragalus (6), a calcaneum (c), three cuneiform bones (d,e,/), and a cuboid (g) in the Echidna; but the cuboid in the Onntho- Fig. Bones of hind-foot, Echidna hystrix, (Cuvier.) rhynchus is divided into two bones, as in some Reptiles, one for the fourth and the other for the fifth metatarsal bones. In both Mono- tremes there is a sesamoid bone (Jig. 178,*) placed at the interspace between the astragalus and the naviculare; a second supernumerary bone (* *) is articulated to the posterior part of the astragalus, and supports the perforated spur which characterizes the male sex (Jig. 173, K,rf). The calcaneum of the Ornithorhynchus ter- minates by sending outwards a short obtuse tuberosity; in the Echidna this part is more slender, and is singularly directed inwards. Please note that these images are extracted from scanned page imag
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