Annals of medical history . ppian Devonian Age of Fishes No evidences of disease are knownfrom these periods. Beginning ofdependent life. 25 Silurian 30 Ordovician Age of Invertebrates Cambrian 31,000,000 to 50,000,000 years Protero- ZOIC Keweenawan Firstknownfossils Bacteria (non-pathogenic) Animikian 35 Huronian Algomian 40 Sudburian 45 45,000,000 to 1,600,000,000 years Archeo-zoic Laurentian No life known 50 55 60 Paleolauren-tian Annals of Medical History Arthritides are especially common in Pleis-tocene mammals. The most prominent caseof a deformed joint is the case of two caudalvertebrae
Annals of medical history . ppian Devonian Age of Fishes No evidences of disease are knownfrom these periods. Beginning ofdependent life. 25 Silurian 30 Ordovician Age of Invertebrates Cambrian 31,000,000 to 50,000,000 years Protero- ZOIC Keweenawan Firstknownfossils Bacteria (non-pathogenic) Animikian 35 Huronian Algomian 40 Sudburian 45 45,000,000 to 1,600,000,000 years Archeo-zoic Laurentian No life known 50 55 60 Paleolauren-tian Annals of Medical History Arthritides are especially common in Pleis-tocene mammals. The most prominent caseof a deformed joint is the case of two caudalvertebrae (Fig. 14) of a large dinosaur, theinterarticular surfaces of which have beenextensively deformed and surrounded by ahuge exostosial growth. the middle of the tumor-like mass is The lesion has involved a length of12 cm. Its surface generally is rather deeplypitted. There is an unusual ventral growth,which is shown in its normal condition inFig. 15 at A. This bony process, thechevron, which served to protect the cau-. Fig. 14 Two caudal vertebra; of a sauropodous dinosaur, possibly Apatosaurus,ex In biting a pathological lesion which may be interpreted as a hemangioma,as a callus, as due to osteomyelitis or some unknown cause. This is one of themost interesting evidences of disease among fossil animals so far studied. Adetailed account of it will be given later. Other lesions of a similar nature arefairly common among the dinosaurs of North America and Europe. One-halfnatural size. The specimen is from the Como Beds, Comanchian, of Wyoming,and is the property of the Kansas University Museum of Natural History. The mass resembles closely the tumor-like masses seen on oak trees. It entirelyencircles the vertebrae and has involvedfully half of the two bones. The dark linerunning vertically in the middle of indicates the point where the normalunion of the two vertebne would occur,but all evidences of separate structures areobliterated, and the two vertebrae are fusedi
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Keywords: ., bookauthorp, bookcentury1900, bookdecade1910, booksubjectmedicine
