. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. PISCES. 89 No. 338. Ptychodus decurrens, Agass. Group op Teeth. The teeth of this Cesteaciont are of large size and of a more or less square form. The crown of the tooth is deeper than the root, and the summit is granulate at the margin. This specimen was found in the Chalk at Kent, England, and is in the British Museum. Size, 6x3. Price, $ No. 339. Ptychodus decurrens, Agass. Two Teeth. From the same locality and Museum. Price, $ No. 340. Ceratodus .
. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. PISCES. 89 No. 338. Ptychodus decurrens, Agass. Group op Teeth. The teeth of this Cesteaciont are of large size and of a more or less square form. The crown of the tooth is deeper than the root, and the summit is granulate at the margin. This specimen was found in the Chalk at Kent, England, and is in the British Museum. Size, 6x3. Price, $ No. 339. Ptychodus decurrens, Agass. Two Teeth. From the same locality and Museum. Price, $ No. 340. Ceratodus . Two Teeth. The teeth of this Cestraciont are puzzling from the variety of shapes they assume. They have in general an uneven or undulating tipper sur- face of dentine and enamel, and an under-layer of reticulated osseous tissue. These specimens are from the Upper Trias (Keupef ) at Stuttgardt, Wirtemberg, and are now in the Ward Museum of the University of Rochester. Price. $0,80. No. 341. Notidanus esimius, Wagn. Skeleton, on slab. (Young). The teeth of this Shark, instead of having one conical point, have a series of unequal sharp points, resembling in this re- spect the lower jaw-teeth of the living " ; This specimen was found in the lithographic limestone (Upper Oolite) at Eichstadt, Bavaria, and is in the Museum of the University of Munich. Size, 8x4. Prise, $ No. 342. Mesturus verrucosus, Wagn. Skeleton, on slab. This fine fossil Fish is from the same locality and Museum as the preceding. Size, 22 x 14. Price, $ No. 343. Edestes Portion op Dorsal Spine. This remarkable ichthyo- dorulite was discovered in the Coal Measures of Indiana, and is preserved in the Cabinet of Amherst College It is distinguish- ed for the large proportional size of the marginal teeth and their close resemblance to the jaw-teeth of Carcharias, their enamelled border being finely denticulate. Size, 9x3. Price, $ No. 344. Ichthyodorulite. Fossil Dorsal Spine, o
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfossils, bookyear1866
