Gainings — Morphogenesis of Platystrophia. 135 



James, U. P. — Catalogue of the Lower Silurian Fossils of the Cincinnati 



Group, 1871. 

 Kayser, E. — Lehrbueh der Geologie, 1891. 

 Keyes, C. R. — Geology of Missouri, vol. v, Paleontology, 1894. 

 Kler. J. — Studier over den Norske Mellemsilur. Separataftryk af Norges 



Geologiske Undersogelses Aarbog for 1902. 



The Lower Silurian at Khabarova. Scientific Eesults of the Norwegian 



North Polar Expedition. 1902. 

 Kummel. H. B., and Weller, S. — Paleozoic Limestones of the Kittatinny 



Valley, New Jersey, Bull. Geol. Soc. Amer., 12, 1901. 

 Lamaxsky, Wl. — Neue Beitrage zur Vergleichung des Ostbaltischen und 



Skandinavischen Untersilurs. Centralblatt f. Min. Geol. u. Pal. 



(Neues Jahrb.), No. 20, 1901. 

 Lappaeext, A. de. — Traite de Geologie, 1900. 

 Lixdstrom. G. — Bidrag till Kannedomen orn Gotlands Brachiopoder. Of. 



Sven. Vetens. Akad., xvii, 1860. 



Ueber die Schichtenfolge des Silur auf Insel Gotlands. Neues Jahrb. 



f. Min. Geol. u. Pal., 1888, i. 

 Matthew, G. F. — Illustrations of the Fauna of the St. John Group, No. vi. 



Trans. Roy. Soc Canada, ix, Sec. iv, 1891. 

 McCoy, F. — British Paleozoic Fossils, 1852. 



Synopsis of the Silurian Fossils of Ireland, 1846. 



Meek, F. B.— Paleontology of Ohio, i, 1873. 



Miller, S. A. — Monograph of the Class Brachiopoda of the Cincinnati 



Group. Cin. Quar. Jour. Sci., ii, 1875. 

 Morse, E. S. — Early Stages of Terebratulina Septentrionalis. Mem. Bos. 



Soc. Nat. Hist., ii, pt. i, No. 1, 1871. 



Observations on Living Brachiopoda. Mem. Bos. Soc. Nat. Hist., v, 



No. 8, 1902. 



Nettleroth, H. — Kentucky Fossil Shells. A Monograph of the Fossil 

 Shells of the Silurian and Devonian Rocks of Kentucky, 1889. 



Neumayer, M. — Erdgeschichte, 1895. 



Nickles, J. M. — Geology of Cincinnati. Jour. Cincinnati Soc. Nat. Hist., xx, 

 No. 2, 1902. 



Paxder, C. H. — Beitrage zur Geognosie des russischen Reiches, 1830. 



Pexfield, S. L. — On the Use of the Stereographic Projection for Geograph- 

 ical Maps and Sailing Charts. Am. Jour. Sci. (4), xiii, 1902. 



Perrier, R. — Elements d' Anatomie Comparee, 1892. 



Raymoxd, P. E.— The Crown Point [N. Y.J Section. Bull. Am. Paleontol- 

 ogy, No. 14, 1902. 



Ruedemaxn, R. — Evidence of Current Action in the Ordovician of New 

 York. Am. Geol., xix, 1897. 



Hudson River Beds near Albany [N. Y.] and their Taxonomic Equiva- 



lents. Bull. N. Y. State Mus., vol. 8, No. 42, 1901. 



The Trenton Conglomerate of R} T sedorph Hill, Rensselaer Co., N. Y., 



and its Fauna. Bull. N. Y. State Mus., No. 49, 1901. 

 Sardesox, F. W. — The Galena and Maquoketa Series. On Orthis testudi- 



naria. Am. Geol., xix, 1897. 

 Schlotheim, E. F. vox. — Die Petrefactenkunde auf ihrem jetsigen Stand- 



punkte, 1820. 

 Schmidt, F. — Beitrag zur Geologie der Insel Gotland. Archiv. f. d. Natur- 



kunde Liv.-Ehst.-und Kurlands, Ser. i, Bd. ii, Lief, ii, 1859. 



On the Silurian (and Cambrian) Strata of the Baltic Province of Russia 



as Compared with those of Scandinavia and the British Isles. Quar. 

 Jour. Geol. Soc. Lond., xxxviii, 1882. 



Untersuchung fiber die Silurische Formation von Ehstland Nord-Liv- 



land und Oesel. Archiv. f. d. Naturkunde Liv.- Ehst.- und Kur- 

 lands, Ser. i, Bd. i, 1858. 

 Schuchert, C. — On the Lower Silurian (Trenton) Fauna of Baffin Land. 

 Proc. U. S. National Museum, xxii, 1900. 



