File:Carnegie Institution of Washington publication (1902-) (19915735993).jpg

Title: Carnegie Institution of Washington publication
Identifier: carnegieinstitut238carn (find matches)
Year: 1902- (1900s)
Authors: Carnegie Institution of Washington
Subjects:
Publisher: Washington, Carnegie Institution of Washington
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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THE MICROSAURIAN FAMILY AMPHIBAMID.E. I2Q The osseous part of the vertebra seems to have been but a thin shell, and the struc- ture of the zygapophyses can not be determined. That they were dorsal in position is, however, evident from several vertebrae. The points of these structures project laterally. The tail is short and the caudal vertebrae weakly developed. There are distinct impressions of at least 12 pairs of ribs in the Daniels specimen. They are long, slender, and curved, and there is no definite assurance that there were as many ribs as are indicated (fig. 26) in the restoration (462). The ribs are inter- central (469) and probably occu- pied the full length of the verte- bral column. There may have been as many as indicated in the restoration. One of the most interesting features of the Yale specimen is the preservation of a small patch of skin, evidently from the back, lying to one side near the head, measuring 5 mm. in length by 3 mm. in width. The fragment shows the skin to be of tubercu- lated scales, 4 of which occupy the length of i mm. The scales are somewhat hexagonal, almost rounded, and were relatively quite thick. They lie in a close mosaic (fig. 27). The Yale specimen has, very well preserved, a portion of the
Text Appearing After Image:
Cope. x i.4. /3 FIG. 27.—Skeleton of A Ventral SCUtellae, of the throat, c, carpus; cl, clavicle; cr, caudal rib; cv, caudal vertebra; /, femur; rVlP^t nnrl hpllv Thp arrano-p /;' humerus: il orbit: r' radius; «, ulna; sc, St> clr scapula; */>, sclerotic plates; t, tibia and fibula; ts, tarsus; w, ment Of the plates On the throat ventral scutellas. Specimen No. 794, Yale University Museum. and chest is almost exactly the reverse of what Credner has described (190) for Bran- chiosanrus arnblystomus Cred. On the throat, in the present form, the chevron points anteriorly, and it is the anterior prolongation of the belly scutes with the postero- lateral projection of the gular scutes which form the chest and arm scutellation. The belly chevrons point anteriorly, as in Branchiosaurus, the rods formed by the scutes being straight and not curved as in Bra nch iosa urns. The entire ventral armature pre- served is displaced to the left of the animal and only the anterior portion is preserved. The pectoral girdle is only partially known. The scapula is crescent-shaped. The other elements are indicated only by fragments and nothing is known of their form. The arm elements are nearly all known. The humerus is slender and expanded at the ends, with its articular surfaces well developed. The separate radius and ulna are of approximately the same size and length. The carpus is unossified. The com-

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