AND AVES OF NORTH AMERICA. 59 



BELODON CAROLINENSIS, Emmons, Cope. 



Proceed. Ac. Nat. Sci., 1866, 249. Rutiodon (Rhylidodon) earolinensis Emmons' N. Ainer. Geology, p. 82. 

 Geol. Suit. North Carolina. Palaeosaurus sulcatus, Emmons loc. cit. (posterior maxillary teeth), Fig. Emmons 

 Manual of Geology, p. 179. Ccntemodon sulcatus, Lea. Proceed Ac. Nat. Sci., Phila, 1856, 78. Cope, 1808, 221. 

 ? Omosaurus perplexus, Leidy, Proceed. Ac. N. Sci., Phil., 1856, 256. 



This reptile I find on examination of the type specimen to belong here. Teeth of the same are in Wheatley's 

 collection at Phcenixville. I do not consider that any ground of specific distinction between this animal and the C. 

 sulcatus has been pointed out, but leave the discussion of the relations of these Triassic forms for a future essay. 



Lea has called my attention to the fact that through some error in reading the scale, the measurements of tin- 

 type tooth published ai-e double the correct ones. The specimen consist of the distal half of a slightly curved conic 

 tooth, and does not display any pulp cavity; the allusion to this in the original description having reference to frac- 

 ture. The tooth cannot be called sulcate, but is rather weakly ridged or fluted. The original description may 

 therefore be amended to read thus: 



Tooth slightly curved, with low trenchant edges, rounded on the exposed face, openly fluted on the lower 

 (median) portion near the fracture, covered with very minute distinct striae from the point to the base, which stria; 

 cross to the flutings in oblique lines. Length, eight-twentieths of an inch ; greatest breadth, two-twentieths ; pulp 

 cavity minute or none. 



The enamel of the teeth of B. earolinensis is rarely preserved; when this is the case its striae, fluting, etc., are 

 as ascribed in C. sulcatus. 



Coal Measures of the Keuper Trias. Chatham Co., N. Carolina. 



BELODON PRISCUS, Leidy. 



Palaosaurus earolinensis, Emmons, Geological Survey N. Ca., 1856, p. 80. N. Amer. Geology, 1857, 86, figs. 57-8 

 60. nee Rhytidodon earolinensis supra. ? Compsosaurus priscus, Leidy, Proc. Acad. Nat. Sci., Phila., 1856, 165. 

 Clepsysaurus pennsylvanieus, "Lea," Emmons in parte, Geol. Survey N. Carolina, 1856; North Amer. Geology, 1857, 

 pp. 67-71-3; figs. 37 to 50 nee Leaii. 



Represented by numerous specimens from the Triassic of Chatham and Montgomery counties, N. Carolina. Teeth 

 not fluted; caudal vertebras with articular faces broad as long, and centrum little compressed. Size medium. 



BELODON LEAII, Emmons. 



Clepsisaurus leaii, Emmons, Geol. Survey N. Ca., 1856; N. Amer. Geology, 1857. p. 79, fig. 51, PI. 8, figs. 1— t. 



Emmons states that this species is smaller than the last, and that the centrum is longer than broad. Cervical 

 vertebrae short, compressed, extremities strongly concave. The Trias of Dan River, N. Carolina. 



BELODON LEPTURTJS, Oo v e. 

 Spec. nov. 



Represented by wholes or parts of fourteen vertebra?; a left femur and fibula; a phalange; imperfect ilium and 

 ischium attached; with numerous ribs and dermal bones, from several blocks of bituminous shale from the bone bed in 

 the tunnel at Phcenixville, Penna. 



The fragments indicate the largest species of the genus, one of the vertebras with spine, measuring eight inches 

 in total elevation. The centra of the dorsals are wider at the articular faces thau long; in the other two species the 

 length is greater than or equal to the width. The caudal vertebrae are much compressed, not subeylindric as in B. 

 priscus. The femur restored measures thirteen inches in length. Ischium sending a process forwards bounding the 

 acetabulum below in part, largely excavated by the obturator foramen, which is very externally situated. 



The bones were enclosed in five slabs of black, bituminous argillaceous rock of the Phcenixville section, and they 

 were taken out from the same immediate proximity by the workmen engaged in the work in the tunnel. One slab 

 contained three dorsal and two caudal vertebras with chevron bone. The second, one and part of another dorsal ver- 



