92 Trans. Acad. Set. of St. Louis. 



172 Posser (C. S.). Comparison of the Carboniferous and 

 Permian Formations of Nebraska and Kansas. 

 Journ. Geol., vol. 5, 1897. 



tl73 Quenstedt (F. A.). Petrefactenkunde Deutschlands. 

 Bd. 3, Abth. 1, Echinodermen, 1875. 



*174 Roebuck (W. D.). Bibliography: Papers and records 



published with respect to the natural history and 



physical features of the North of England. Echi- 



nodermata 1884 to 1892. 

 Naturalist, 1894. 



tl75 Roemer (F.). Ueber den Bau von Melonites. 

 Wiegmann's Archiv, Jahrg. 21, bd. 1, 1855. 



*176 . Lethaea Paleozoica. 1876-1883. 



Kogers (A. F.). See (23 and 24). 



Kuedemann (Rudolph). See (33). 



tl77 Safford (James M.). Geology of Tennessee. Nash- 

 ville, 1869. 



St. John (O.). See (228). 



178 Salter (J. W.). On some New Palaeozoic Starfishes. 

 Ann. Mag. Nat. Hist., ser. 2, vol. 20, 1857. 



*179 Sandberger (G.) u. (F.). Versteinerungen des Ehein- 

 ischen Schichtensystems. 



180 Schluter (Clem.). Ein neuer Echinide (Xenocidaris 

 conifera) aus dem Mittel Devon der Eifel. 



Verhdl. Naturw. Ver. Pieuss. Rheinl. u. Westf. Sitzb.,bd. 

 38. Bonn, 1881. 



tl81 Schmidt (F.). Miscellanea Silurica II. 



M^m. Acad. Imp. St. Petersbourg, ser. 7, vol. 21, no. 11, 1874. 



tl82 Schultze (L.). Monographic der Echinodermen des 

 Eifeler Kalkes. 



Denkschr. K. Akad. Wiss. Wien, Math. Naturw. CI., no. 

 26, 1866. 



