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I.—On some New Pycnodonts

  • Philip Grey-Egerton

Extract

Mr. alfred craven, who for some months past has been occupied in making a collection of the organic remains found in the Gault at Folkestone, has submitted to me for examination and description (if requisite) a specimen of a Pycnodont jaw which, both for the perfect condition in which it is preserved and for the peculiarity of its characters, is worthy both of description and representation. The specimen is the right mandible with most of the tritoral teeth preserved in their natural position. It betokens a fish of the largest size of the family to which it belongs, rivalling in this respect even the Pycnodus gigas of the Jura beds. The symphyseal border (PI. III. Fig. 1 s) measures two inches and eight-tenths of an inch in length, and half an inch in thickness. As the anterior extremity is wanting, the natural size was probably half an inch longer. The outer margin of the jaw measures four inches, and the basal line—connecting the outer and symphyseal elements of the triangle—three inches and two-tenths. The dental armature is composed of four ranks on the anterior and three on the posterior area of the mandible. The inner row (Pl III. Fig. 1 a) consists of teeth very considerably larger than those of the succeeding rows. Six of these are retained; but as the anterior extremity of the bone is broken, there were probably one or two more. The individual teeth measure nine-tenths of an inch by four-tenths. They are elliptic in outline, but slightly crescentic on the anterior margin.

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page 50 note 1 Poissons Fossiles, vol. 2, pt. 2, page 183.

page 50 note 2 Traité de Paléontologie, vol. 2, p. 197.

page 50 note 3 Poissons Fossiles du Bugey, p. 11.

page 50 note 4 Poissons des Formations Secondaires du Boulonnais.

page 51 note 1 Beiträge zur Kenntniss der fossilen Fische Oesterreichs, pt. 2.

page 54 note 1 Thiolliere is inclined to think that the so-called Vomer may be compounded of three bones, the Vomer proper carrying the three median rows of teeth, and the Palatine or Maxillary bones the outer of marginal rows.—Poisaons Fossiles du Bugey, p. 18.

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