1 36 ( 'urn ings — Morphogenesis of Platystrophia. 



Schuchert, C. — Synopsis of American Fossil Brachiopoda including Bibliog- ' 



rapln and Synonomy. Bull. U. S. Geol. Surv., No. 87, 1897. 

 Shaler, N. S.— Brachiopoda of the Ohio Valley, 1887. 



Bull. Mus. Comp. Zool., 4, 1865, p. 67. 



Sowerby, J. de C. — In Article on the Classification of the older Stratfied 



Bocks of Devonshire and Cornwall, by Sir R. I. Murchison and 



Adam Sedgwick. Trans. Geol. Soc. Lond., 2d Ser., vol. v, 1840. 

 Ulrich, E. 0., and Schuchert, C. — Faleozoic Seas and Barriers in Eastern 



North America. Bull. N. Y. State Mus., No. 52, 1901. 

 Verneuil, E. de. — Geol. de la Russie d'Europe et de Montagnes de l'Oural, 



1845. 

 Vries, H. de. — The Origin of Species by Mutation. Science, N. S., xv, No. 



384, 1902. 

 Walcott, C. D. — The Fauna of the Lower Cambrian or Olenellus Zone. 



10th Ann. Rep. U. S. Geol. Surv., 1891. 

 Weller, S. — The Silurian Fauna interpreted on the Epicontinental Basis. 



Jour. Geol., vi, 1898. 

 Whiteaves, J. F. — Recent Discovery of Rocks of the Age of the Trenton 



Formation at Akpatok Island, Ungava Bay, Ungava. Am. Jour. 



Sci. (4), viii, 1899. 

 Williams, H. S. — Geological Biology, 1895. 

 Winchell, N. H. and Schuchert, C. — Geology of Minnesota, vol. iii, pt. i, 



Baleontology, 1892. 

 Wysogorski, J. — Zur Entwicklungsgeschichte der Brachiopodenfamilie der 



Orthiden im ostbaltischen Silur. Zeitschr. d. Deutch. Geol. Ges. 



Jahrg., 1900. 

 Yatsu, N. — On the Habits of Japanese Lingula. Annotationes Zool. Jap., iv, 



pt. 2, 1902. 

 Zittel, K. A. von. — Textbook of Baleontology (Eastman Tr.), 1899. 



