1 68 THE APPENDAGES, ANATOMY, AND RELATIONS OF TKILOBITES. 



REED, F. R. C. 



1916. The genus Trinuclcus. Pt. 4. Geol. Mag., dec. 6, vol. 3, pp. 121, 122. 



RICHTER, R. 



1848. Bitrag zur Pakeontologie des Thiiringer Waldes. Dresden and Leipzig. 



RlNGUEBERG, E. N. S. 



1886. A trilobite track illustrating one mode of progression of the trilobites. Proc. 

 Amer. Assoc. Adv. Scu, vol. 35, p. 228 (abstract only). 



RUEDEMANN, R. 



1916. The presence of a median eye in trilobites. Bull. New York State Mus., No. 189. 

 pp. 127-143, pis. 34-36. 



SCHLOTHEIM, E. F. VON. 



1823. Nachtrage zur Petrefactenkunde, II. Gotha. 



Six, ACHILLE. 



!884. L es appendices des trilobites d'apres M. Ch. D. Walcott. Ann. Soc. Geol. du 

 Nord, vol. ii, pp. 228-236. 



SPENCER, W. K. 



1903. The hypostomic eyes of trilobites. Geol. Mag., dec. 4, vol. 10, pp. 489-492. 



STAFF, HANS v., and RECK, HANS. 



1911. Ueber die Lebensweise der Trilobiten. Eine entwicklungsmechanische Stuclie. 

 Gesell. naturforsch. Freunde, Sitzb., pp. 130-146, figs. 1-20. 



STERNBERG, K. M. 



I g3o. Ueber die Gliederung und die Fiisse der Trilobiten. Isis (Encycl. Zeitung), Oken, 



p. 516, pi. 5, figs. 1-3. 

 STOKES, C. 



1823. On a trilobite from Lake Huron. Trans. Geol. Soc., London, ser. 2, vol. i, p. 

 208, pi. 27. 



SWINNERTON, H. H. 



1919. The facial suture of the trilobite. Geol. Mag., dec. 6, vol. 6, pp. 103-110. 



TORNQUIST, S. L. 



1896 A. On the appendages of trilobites. Ibid., dec. 4, vol. 3, p. 142. 

 1896 B. Linn;eus on the appendages of trilobites. Ibid., pp. 567-569. 



TOTHILL, J. D. 



1916. The ancestry of insects, with particular reference to chilopods and trilobites. Amer. 

 Jour. Sci. (4), vol. 42, pp. 373-3 8 3. text ngs- I ~ 8 - 



TROEDSSON, G. T. 



1918. Om skanes Brachiopodskiffer. Lunds Universitets Arsskrift, n. f., Avd. 2, Bd. 15, 



Nr - 3- PP- 57- 6 7, Pi- i, n g s - 1 9~ 2 4- 

 VALIANT, W. S. 



1901. Appendaged trilobites. The Mineral Collector, vol. 8, No. 7, pp. 105-112. 



VOLBORTII, A. VON. 



1858. Ueber die Bewegungs-Organe der Trilobiten. Verhandl. russ. k. mineral. Gesell. 



zu St Petersburg, 1857-1858, p. 168. 

 1863. Ueber die mit glatten Rumpfgliedern versehenen russischen Trilobiten, nebst einem 



