File:Transactions and proceedings of the New Zealand Institute (1873) (14564684939).jpg

Identifier: transactionsproc61873newz (find matches)
Title: Transactions and proceedings of the New Zealand Institute
Year: 1868 (1860s)
Authors: New Zealand Institute (Wellington, N.Z
Subjects: Science Birds
Publisher: Wellington : J. Hughes, Printer
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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ut half thelength of the tooth series. The teeth are badly preserved, but consisted of athin layer of enamel enclosing a widely conical cavity, not constricted at thebase. The teeth are finely striated, only slightly compressed, and withoutany well-marked ridge; length, 1 inch, greatest diameter at base 8 inch.Although firmly imbedded in cement they aj)pear to have been attached bythin bases to the inner side of the floor of the dental groove, the exteriorparapet being very low, so that the teeth must have been set in the jaw witha marked lateral divergence, and not placed vertically as in Leiodon. This isshown in two sections of the jaw on Plate XXVI., figs, b and c, but inwhich the lines XY are perpendiculars, the drawings having been wronglyplaced on the stone. By working out tlie base of the skull, which is muchfractured, a smaller and more cylindrical tooth was exposed, whicli wasprobably a pterygoid tooth, such as are found in Mosasaurus. The cranial TRAMS. N.Z.INSTrUTE,VOLM.Pi:
Text Appearing After Image:
J.B. del. e-i lilTb. TANIWHASAURUS OWEN I . n.sp. Hector.^—On the Fossil Reptilia of New Zealand. 355 bones which have been exposed have a thin squamous strncture, with ridges radiating fvora the centres of ossification, that give them the appearance of fish bones. The orbit is well defined bj a distinct bony arch liaving a rounded margin. 13. Ichthyosaurus australis, n. sp. This genus is only represented in the collection by a single vertebralcentrum, in a matrix of dark-coloured, fine-grained, micaceous sandstonel.telongiug to the rocks of Mount Potts, in the Eangitata district of theProvince of Canterbury. Dr. Haast thus describes the strata from which thespecimen in question was obtained:—The beds are here represented by a greatthickness of dark shales, often becoming so slaty that they may be termedclay-slates, alternating with thinner layers of sandstone, sometimes with aferruginous or calcareous matrix. Amongst these occur a few beds ofconglomerate, which fairly may be term

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