. The Quarterly journal of the Geological Society of London. arger scattered teeth on the sym-physis belong to lateral series i, as seems probable, it is also to be 1 On the Dentition & Affinities of the Selachian Genus Ptychodus, AgaasQuart. Journ. Geol. Soc. vol. xliii 1887 pp. 121-30 £ pi. x. - S. , Cretaceous Selachians & Pycnodonts Univ. Geol. , vol. vi (1900) p. 230 & pis. xxy-xxtu. 134 DR. A. SMITH WOODWARD ON THE [May 1904. noticed that they exhibit a more decided obliquity, with a smallermedian elevation, than the corresponding teeth farther transverse
. The Quarterly journal of the Geological Society of London. arger scattered teeth on the sym-physis belong to lateral series i, as seems probable, it is also to be 1 On the Dentition & Affinities of the Selachian Genus Ptychodus, AgaasQuart. Journ. Geol. Soc. vol. xliii 1887 pp. 121-30 £ pi. x. - S. , Cretaceous Selachians & Pycnodonts Univ. Geol. , vol. vi (1900) p. 230 & pis. xxy-xxtu. 134 DR. A. SMITH WOODWARD ON THE [May 1904. noticed that they exhibit a more decided obliquity, with a smallermedian elevation, than the corresponding teeth farther transverse measurements (in millimetres) of the teeth of theseveral series at the back of the symphysis are as follows:—0, 8 ;1, 6-5; 11, 5; in, 4 ; iv, 3; v, 2. The upper dentition of the right side is partly exposed from itsdecayed attached face (PL XV. fig. 2, i-vi), partly seen from its oral Ptychodus deeurrens, Ag. ; oral aspect of the mandible of a smallvariety or young individual, restored natural size ; from theLower Chalk of Glynde ().. aspect on a detached piece of chalk (fig. 3). The median row ofvery small teeth is scarcely visible in the fragment just mentioned,the large teeth of the first paired series being crushed together toobscure it, but it is shown in back-view (fig. 3 a, 0). Of the firstpaired series (1) three teeth are preserved on the right and six onthe left side, all in natural sequence. They are about as large asthe teeth of the same series in the opposing jaw. The two or threehindermost teeth (fig. 4) correspond with those ordinarily forming >>< . 1 o o ?~o CDO o ci
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
