The Quarterly journal of the Geological Society of London . th the hones contain Physa Bristovii ?,Valvata, Limnmis, Cypris, and vegetable remains. VOL. X. — PART I. 2 G 424 PROCEEDINGS OF THE GEOLOGICAL, SOCIETY. [June 7, shells. In it are imbedded some dermal bony scutes, portions ofribs, the neural arch of a vertebra, and parts of the dentary elementsof the rami of a lower jaw with teeth—one (fig. 7) containing thir-teen teeth, the other (fig. 8) four teeth ; in both figures the naturalsize is given in outline. The teeth are anchylosed to an exterioralveolar wall, and have short, broad, sub
The Quarterly journal of the Geological Society of London . th the hones contain Physa Bristovii ?,Valvata, Limnmis, Cypris, and vegetable remains. VOL. X. — PART I. 2 G 424 PROCEEDINGS OF THE GEOLOGICAL, SOCIETY. [June 7, shells. In it are imbedded some dermal bony scutes, portions ofribs, the neural arch of a vertebra, and parts of the dentary elementsof the rami of a lower jaw with teeth—one (fig. 7) containing thir-teen teeth, the other (fig. 8) four teeth ; in both figures the naturalsize is given in outline. The teeth are anchylosed to an exterioralveolar wall, and have short, broad, subcompressed, rounded, obtusecrowns (b, b). The hinder teeth show a little increase of size, aremore obtuse and compressed, and are slightly expanded. Some ofthe anterior teeth (fig. 7, a) are a little pointed. The enamel is Fig. 7.—Part of the left side of Fig. 8.—Part of the lower jaw, the lower jaw, with teeth, of with teeth, of the Macello- the Macellodus Brodiei, dtjs Brodiei, Owen. (Nat. Owen. (Nat. size, and mag- size, and magnified.)nified.). a, b- Two of the teeth magnified. b. One of the teeth magnified. polished, but is marked by fine longitudinal grooves as it approachesthe summit of the crown, like those in the upper jaw oi the Ma-cellodus ; from which character, and from the progressive acquisitionof a similar spade-like shape of the crown, as the teeth recede fromthe apex of the jaw, I conclude that the present is the lower jaw ofthe same species. The teeth are separated on the average by a spaceequal to the antero-posterior diameter of the crown; but some arecloser together, others wider apart. The dentary bone (fig. 7) con-taining them exhibits a wide posterior notch for articulation with theangular and surangular elements. The outer surface of the dentaryelement is smooth and convex. The teeth are much smaller in pro-portion to the jaw than in the Nuthetes, figs. 1 & 2, and evidentlybelong to a distinct genus of Lizard. The dermal scutes are subquadrate,
Size: 2113px × 1182px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
