I 



Scientific Intelligence — Mineraloyy. 375 



of Art.t and Sciences, 2d Ser., vol. iii. Boston, 1848.^ — This elabo- 

 rate memoir extends to 128 pages quarto, and is illustrated by 24 

 plates, together with a large table, giving a general view of the dis- 

 tinctive characters of the species. The learned author has pursued 

 the course usual in palaeontology, of distinguishing the genera and 

 species of the animals indicated by the fossil remains, and naming 

 them accordingly. Although the remains are but foot-marks, they 

 point out, under the guidance of the unerring principles of compara- 

 tive anatomy, the habits of several animals, the classes to which 

 they pertain, and the peculiarities, to some extent, of the species. 

 These characters have been seized, and upon them the descriptions 

 and names are based 51 species are included in the memoir, 12 of 

 which are of quadrupeds, 4 pi'obably of lizards, 2 chelonian, 6 ba- 

 ti'achian, 2 annelids or molluscs, 34 bipeds, 3 doubtful; and of the 

 bipeds 8 were thick-toed tridactylous birds, 16 were narrow-toed 

 tridactylous or tetradactylous birds, 2 were batrachian, and the re- 

 maining 8 either birds or reptiles, and probably the latter. We 

 have to defer to our next number a farther account of the genera 

 and species. — (American Journal of Science and Arts, vol. viii., 

 No. 22, 2d Series, July 1849, p. 151.) 



9. Fossil Foot-marks of a Reptilian Quadruped beloiv Coal. 

 — At a late hour we have received the following letter from Mr 

 Isaac Lea (dated Philadelphia, June 17), on Foot-prints in Pennsyl- 

 vania in rock below the coal ; a further notice is necessarily deferred 

 to our next number : — " I am sure it will greatly interest you to 

 learn that it has been my good fortune to have discovered ' fossil 

 foot-marks ' of a reptilian quadruped in the series below any here- 

 tofore observed. In a late visit to the southern coal-field of Penn- 

 sylvania, while makinix some geological investigations, I found six 

 distinct double impi'essions in regular progression, in the old red 

 sandstone. These were accompanied by numerous ' ripple-marks,' 

 and ' pits of rain-drop.s,' over the whole exposed surface of the rock. 

 The lowest heretofore observed, I believe, are of the Cheirotherium , 

 described by Dr King in the coal- formation near Greensburg Pa., 

 and those mentioned by Dr Logan in the same formation of Nova 

 Scotia. The name I have proposed for this reptile is Sauropus 

 primrevus." — (^American Journal of Science and Arts, vol. viii., 

 2d Series, No. 22, p. 160.) 



MINERALOGY. 



10. Emery Formation of Asia Minor. By J. Laivrence Smith. 

 — The following communication, received in a letter from Dr Smith, 

 dated Constantinople, January 5, 1849, is a translation of a com- 

 munication addressed by him to Elie de Beaumont. 



" These lines are written with rclei'ence to an extract of a letter 

 from M. Pierre de Tchihatcheff, pui)lishcd in the Oomptes llendus 

 do TAcadLinie des Sciences, the 20th xMarch 1848. It is only 

 lately that my attention was attracted by this letter, more especially 



