3 



Number 3. 



Diameter extremity tibia (transverse) 126 



" " " (antero-posterior) 096 



" head •" (transverse) 140 



" glenoid cavity scapula 150 



Further details of the structure of this animal will be sought for with 

 interest. From the manner of its occm-ence, it probably went in families 

 or herds. 



Crocodiles cl wis. Cope. 



This is a large species with a muzzle of narrowed proportions and 

 sufficient depth to give it a broad oval section. The nasal bones appear 

 to have reached the nareal orifice. The anterior superior teeth are very 

 large, especially the canine. The inferior tooth corresponding is large, 

 and occupies an emarginafcion which approaches near to the nasal suture. 

 The pitting of the muzzle is fine, and the swollen interspaces much the 

 wider. The teeth have stout conic crowns, with well developed cutting 

 edges and coarse striate sculpture. The mandible is acuminate to the 

 narrow extremity, and has a long symphysis, which extends to opposite 

 the third tooth behind the notch. The cervical vertebrae preserved, have 

 round cups ; they have a simple elongate hypapophysis with a pit behind 

 it ; shoulder very prominent. 



M. 



Length of ramus with teeth 



" " symphysis.. 135 



Width do. at end of symphisis 085 



" do. " mandible 020 



" maxillary at third tooth above. 060 



" " "notch above ....020 



This species has a more slender muzzle than those described by Marsh 

 and Leidy, and is of larger size. 



Rhineostes peltatus. Cope. 

 Gen. et sp. nov. Nematognatnorum. 

 Established on cranial and other bones, with spines of a siluriform fish 

 of the size of the largest species of Amiurus. The form, in the excessive 

 rugosity of the external long surfaces, reminds one of some of the Bra- 

 zilian Dorades. The frontal fontanelle is closed, though very distinctly 

 marked by a groove of the surface not rugose. The rugosity consists of 

 innumerable, packed osseous popillse. The cranial ossification is con- 

 tinued posterially as a shield, which is strongly convex from side to side. 

 The spine is symmetrical, and probably dorsal. It is compressed and curved 

 antero-posteriorly, and is deeply grooved behind. Laterally it is closely 

 striate grooved ; the anterior face is narrowed, obtuse, and minutely ser- 

 ' rate with cross ridges ; each side of it is rugose with several irregular 

 series of pronounced tubercles, arranged transversely. 



