. Chordate morphology. Morphology (Animals); Chordata. //^â ^ '^''"'â â ^â ^. rhinariunr OPOSSUM Figure 2-12. The marsupial and placental mammals. a part of their early development. The nipples of the mam- mary glands are in this pouch, which gives the group its name. The eyes are large and prominent and there are large, bare auricles (ears) (Figure 2-12). The body is covered with long hair. The rat-like tail, covered with scales, is pre- hensile, being used by the animal to hang from branches. Placenta/ The body of the rat (Figure 2-12) is covered with dense hair, and its long tail is sc
. Chordate morphology. Morphology (Animals); Chordata. //^â ^ '^''"'â â ^â ^. rhinariunr OPOSSUM Figure 2-12. The marsupial and placental mammals. a part of their early development. The nipples of the mam- mary glands are in this pouch, which gives the group its name. The eyes are large and prominent and there are large, bare auricles (ears) (Figure 2-12). The body is covered with long hair. The rat-like tail, covered with scales, is pre- hensile, being used by the animal to hang from branches. Placenta/ The body of the rat (Figure 2-12) is covered with dense hair, and its long tail is scaled, with some hairs growing out between the scales. The limbs are similar to the opossum's. There is no marsupium; the nipples are arranged in bilateral lines along the belly. The young remain within the mother's body for a longer developmental (gestation) period. They are nourished through a special structure, the placenta. FOSSIL VERTEBRATES An examination only of living forms results in overlook- ing many interesting groups represented by fossils. Some of these will be introduced here, whereas others will be re- ferred to in the discussion of specific anatomical areas. Well-known fossil agnath fishes, related to the cyclo- stomes, include such genera as Tremalaspis, Cephalaspis, ronchial opening. 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 Jollie, Malcolm. New York, Reinhold
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