Champsosaurus annectens

The greater number of vertebrae obtained belong to this saurian, which may therefore be looked upon as the type of the genus. The cervical which bears the hypapophysial facet presents a carina below, which is only prominent between the articular faces. One such cervical in the collection is rounded below, aud may be anterior in the series, or may belong to another species. The inferior keel is strong on the other cervicais, hut soon disappears on the anterior dorsals. The remaining centra are rounded below. The parapophyses where present are knob-like, aud the corresponding part of the transverse process is similar in the anterior dorsal vertebrae. The base of the neural arch is nearer the anterior than the posterior articular face. These faces are nearly round in the anterior caudal central, but soon become vertical ovals, with the compressed form. There is a fossa below and in front of the parapophysis, which continues to beyond the anterior dorsals. The dense layer of the surface of the centrum is smooth, except some delicate striations near the articular borders. These are most marked along the median interior face of the caudal vertebrae, which is flat, grooved, and distally acute. I cannot certainly connect the vertebrae of a series as those of a single individual. Measurements. No. 1. M. Diameter of a cervical with hypapophysis {antero-posterior vertical transverse. 023.021. 020 No. 2. antero-posterior Diameter do. without hyapophysis {vertical transverse I .. 017. 0165.017 No. 3. antero-posterior Diameter do. without hypapophysis {vertical transverse. 011.0105.011 No. 4. Diameter of an anterior dorsal {antero-posterior vertical transverse. 023. 023. 023 No. 5. Diameter of an anterior dorsal {antero-posterior vertical transverse. 008.0072. 0075 No. 6. Diameter of a sacral centrum {antero-posterior vertical transverse. 010.009.009 No. 7. Diameter of an anterior caudal {antero-posterior vertical transverse. 083.053.058 No. 8. Diameter of n median caudal {antero-posterior vertical transverse. 017. 011.011 No. 9. Diameter of a posterior caudal {antero-posterior vertical transverse. 014. 0086.007 A vertebra not distinguishable from the corresponding one of this species was found near Amell's Creek, on a bank of deposit of the Fox Hills group (No. 5), with the bones of the Uronautes cetiformis, supra. l cannot account for this circumstances, as it is the most abundant fossil of the Judith River beds (No. 6).