Baena hatcheri, Hay, 1901

Lambe L. M., 1902, New genera and species from the Belly River Series (mid-Cretaceous), Geological Survey of Canada Contributions to Canadian Palaeontology 3, pp. 25-81 : 43-44

Baena hatcheri , Hay.

Baena hatcheri Hay. 1901 . Annals of the Carnegie Museum, pp. 325-.326) plate XV . " Description of a new species of Baena (B. hatcheri) from the Laramie beds of Wyoming."

This species is represented from the Cretaceous of Red Deer river by a specimen, fig. 8 , in which the whole of the plastron is preserved with the anterior half of the carapace. The sutures between the bones are well defined and the sulci are distinct. The carapace has suffered slightly from distortion, but the plastron is admirably preserved leaving little doubt as to the specific identity of the Red Deer river turtle with the Wyoming type.

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Additional.specimeus consist of the anterior half of a plastron, parts of two other plastra, and a poorly preserved carapace of small size in which, however, the convexity of this half of the shell is well shown.

The variation in the direction of the gular and intergular sulci, in different individuals, to which Leidy drew attention in his description of Ba'ena arenosa,* from a higher horizon, is noticeable in the two Red Deer river specimens, neither of which agree exactly with the type.

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Belly Eiver series, Eed Deer river, 3901.

Figures

PLATE XV. Fig. 1. Ornithomimus altus, Lambe, caudal vertebra, superior view, natural size. Page 52. Fig. 2. View of right side of same. Fig. 3. Ornithomimus altus, caudal vertebra, superior view natural size. Page 52. Fig. LL. The same, inferior view. Fig. 5. The same, right side. Fig (S. Ornithomimus altus, left sidc of lumhar vertebra of small individual natural size. Fig. 7. The same, superior view. Fig. S. The same, anterior view. Fig. Ü. Terminal phalanx of megalosauroid dinosaur, lateral view; natural size. Fig. 10. The same, proximal view. z, prezygapophysis i, postzygapoplıysis; s, neural spine e, transverse process. Fig, ll. Tooth of Deinorloıı cnrplanatus‘, Cope, side view; four times the natural size. Page 45). Fig. 12. Transverse section of the same. Fig. 13. Ptilodus primaevus, Lambe, right man libular rztmus,c.\' ternal view; enlarged four times. Page 79. Fig. 1 -1. The same, internal view. pflf, fourtli prernolar; mf, first molar i, socket for incisor; n, socket for second molar. Fig. 15. Boreodon matutinus, Lambe, premolar. side view, four times natural size. Page TQ c, cingulum. Fig. 16. Right maxillary bone, (provisionally associated with Scapherpelnu tectmn), external view, four times thc natural size. Fig. ii. Inferior' view of the samc, similarly cnlargcd. Page 32. Fig. is. Prcınaxillary bone of Diphyodus longirostris, Lambe, inferior view; enlarged four times. Page 30. Fig. 19. Transverse section of samc, similarly enlarged. t, tooth-base m, interspace.

Fig. 8. The plastron of Baena hatcheri; from Red Deer river. One-half natural size. /&',Intergular shield; G, Gular do.; HUM, Humeral do.; PEC, Pectoral do.; AB, Abdominal do.; FEM, Femoral do.; AN, Anal do.: ep, Epi- plastral bone; entp, Entoplastral do.; hyp, Hyoplastral do.; msp, Mesoplastral do.; hpp, Hypoplastral do.; xp, Xiphiplastral do. * centre of front margin of carapace