MEXICAN BOUNDARY LINE. 143 



Cretaceous fossils from Jacun, 3 miles below Laredo, collected by A. Schott. 



Inoceramus Crispii, Mantell. 



I. Tesanus, Con. 



Ostrea crenuliraargo, Eoemer. 



Exogyra costata, Say. 



Dosinea, (imperfect casts.) 



Turritella (casts.) 



Natica, (casts.) 



Cretaceous fossils from Lepan Hills, collected by A. Schott. 



Exogyra arietina, Roemer. 

 Terebratula Wacoensis, Roemer. 

 Neithea Texana (Pecten, Roemer,) 

 Cardium congestum. Con. 

 Ammonites Texanus, Roemer. 

 Hemiaster Texanus, Roemer. 

 Holectypus planatus, Roemer. 



Of the above species C. congestum was collected on the Rio San Pedro, and all the others on 

 the Rio Bravo del Norte. 



Cretaceous? fossils from, Dry Creek, Mexico, collected by A. Sclwtt. 



Ostrea cortex, Con. 

 0. multilirata. Con. 



Cretaceous fossils from various localities, collected by A. Schott. 



Neithea Texana (Pecten Roemer.) San Pedro River, mouth of painted caves ; valley of the 

 Rio Bravo, a few miles below the mouth of Rio San Pedro ; upper valve of the same, near the 

 mouth of the San Pedro. 



Terebratula Wacoensis, Roemer, Aroyo Pedras Pintas. 



Terebratula Wacoensis. — Ihid. 



Inoceramus Crispii, Mant. Aroyo Pedras Pintas and Las Moras. 

 " " ? Salt Creek. 



Neithea occidentalis, Con. Aroyo Las Minas, between Leon and Eagle Pass. 



Ostrea carinata? Lam. Turkey Creek, Las Minas. 



0. anomifeformis, Eoemer, Turkey Creek, Las Minas. 



Cardium congestum. Con. Valley of Royo San Felipe. 



Ammonites flaccidicosta, Roemer, bed of Rio San Pedro. 



A. Texanas, Roemer. 



A. pedernalis, Roemer, Rio Bravo del Norte, near the mouth of Puercos river. 



A pedernalis. Yellow stone. 



Rostellites Texanus, Con. Eagle Pass. 



