"The neuropophyses are not anchylosed to the centrum, as in the mammalia, nor connected to it by sutures, as in the crocodiles; but their union with the vertebra is indicated by two pits, which served for their articulating surfaces. These depressions are situated on the superior surface of the centrum intermediate between the anterior and posterior margins of the extremities. They are circular in form and sink directly into the body of the vertebra; instead of being elongated longitudinally and raised by ridges, as in _Ichthyosaurus_. The pits are about a line in depth, and in the more perfect of the fossils are not in their original position. The floor of the spinal canal is narrow, being but 5 lines in breadth. A rudimentary transverse process, or exogenous tubercle, is sent off from each lateral surface of the centrum, at points equidistant from the extremities of the vertical diameter. Their position is near the margin of the anterior articular surface, and the edges of these parapophyses make the transverse diameter of this extremity somewhat greater than that of the corresponding posterior facet." Measurements of the More Perfect Vertebra of Eosaurus acadianus (after Marsh). mm. Transverse diameter of centrum on anterior surface 59 Same on posterior surface 57 Same including the parapophyses 63 Vertical diameter of anterior surface 54 Anteroposterior diameter on superior surface 21 Same on inferior surface 19 Same between centers of articular facets 2.5 Length of pits for articulation of neural arch 7 Breadth of same 7 Depth of same 2 Distance between centers of same 11 Same at centers of parapophyses 36 Collected by O. C. Marsh at the South Joggins, Nova Scotia. Marsh regarded (404) the vertebræ as representing a new type of ichthyosaurian (2), but there can be no doubt that the vertebræ belong to some form of the Amphibia, since the description applies equally well to them. In this connection mention must be made of a large rib from the Linton beds preserved in the U. S. National Museum. Only the proximal third of the rib is preserved, but it represents some large form of the Stegocephala. The rib is strongly curved backward, is heavy, and has an incipient tubercle. A cross-section shows that a longitudinal groove occupies the median line on the exposed surface of the rib. This may, however, be due to compression and thus indicate that the rib was hollow. The rib as preserved measures: length, 102 mm.; maximum width, 22 mm.; minimum width, 14 mm. (Nos. 4490, 4489, U. S. National Museum.) =Genus EOBAPHETES new name.= Type: _Eobaphetes kansensis_ Moodie.