554: The Andes and the Amazons. 



common along the left bank of the Utcubamba, near Tin- 

 go. Some of the Ammonites are a foot in diameter. Be- 

 lemnites and Star-fishes have also been found farther down 

 the Utcubamba, near Bagua ; and at San Carlos is an ex- 

 tensive salt deposit. The dark-brown shale near the sum- 

 mit of Piscoguanuna, dipping strongly to the eastward, 

 contains numerous Middle Lias Ammonites. The rapid 

 Cachiyacu, tearing its way down from the Punta de Schal- 

 ca, brings along many Ammonites and Brachiopods of Cre- 

 taceous age. This Punta, the saddle wliich divides the riv- 

 ers Cachiyacu and Mayo, continues northward, and through 

 its limestone strata the Maranon has cut the Pongo de 



to the Boston Society of Natural History, January 20th, 1875, entitled Notice 

 of Jurassic and Cretaceous Ammonites collected in South America by Professor 

 James Orton, with an Appendix upon the Cretaceous Ammonites of Professor 

 Hartt's collection : 



"Jurassic Ammonites (Lias): Amioceras ceras, Agassiz (Amm. ceras, 

 Giebel). — Under this name I have been obliged to describe several badly pre- 

 served specimens, which resemble in their characteristics very closely this 

 well-marked species of the Lower Lias ; loc. Piscoguanuna, Northern Peru. 

 Arnioceras miserabilis ? Hyatt (A7mn. miserabilis ? Quenst.) ; loc. Piscogua- 

 nuna. Caloceras Ortoni, Hyatt : this new species is closely allied to Amm. 

 sironotus, Quenst., also a Liassic species ; loc. Tingo, Northern Peru. Phyl- 

 loceras Loscombi, Hyatt (^Amm. Loscombi, D'Orb.) : this is another Lias form, 

 probably Middle Lias, from the same locality. Perisphinetes anceps, Waa- 

 gen : this species indicates the presence of the higher divisions of the Jura, 

 the Lower Oxford of Oppel, perhaps the Kelloway division of that formation ; 

 loc. Compuerta, near Lake Titicaca, fifty miles northwest of Puno, altitude 

 of 13,500 feet. Stephanoceras macrocephalus, Waagen : the identity of this, 

 as well as the former, with European species can not be doubted. It indicates 

 the same division of the Jura; loc. Caracolis, near Lake Titicaca. It is 

 probable that the whole series of Jurassic rocks exist in Peru and Bolivia. 



"Cretaceous Ascmonites. — The remarks upon the specimens in this di- 

 vision are interesting simply because they have furnished me the means of 

 establishing a new genus to include the forms which have hitherto been re- 

 garded as Cretaceous Ceratites. This genus I have called Buchiceras, in 

 honor of the great German geologist, Leopold Von Buch. It includes the 

 following species : B. bilobatum, Hyatt, n. s. ; loc. Punta de Schalda, Northern 

 Peru. This would be generally supposed to be identical with the Amm. Sy- 

 riacus. Von Buch ; but the comparison of authentic specimens shows spe- 

 cific differences. B. serratum, Hyatt, n.s., loc. Cachiyacu, Northern Peru, 

 doubtless washed down from the Punta de Schalca." 



