SUBCLASS I 



TRILOBITA 693 



cephahn, thorax and abdomen distinct. Cephalon covered with a shield composed of 

 a primitively pentamerous middle piece, the cranidium, and two side pieces, or free 



Mineral. Gesellscli. St. Peterslmrg, 1857-58.— Salter, .T. W., A Monograph of British Trilobites. 

 Palaeontographical Society, 1864. — Idem and Woodward, H., Ibid., 1867-84. — Schmidt, F., 

 Revision der ostl)altischen silurischen Trilobiten. Mem. Acad. Imp. St. Petersbourg, 1882-1907, 

 ser. 7, vol. XXX., and ser. 8, vol. xii. — Brogger, W. C, Die silurischen Etagen 2 und 3 in Kristiana- 

 gebiet und auf Eker, 1882.— Hohn, G., De Svenske Arterna af Trilobitslilgtet Illaeuus. Bihang 

 Sveusk. Vetensk. Akad. Handl., 1882, vol. vii., no. ^.—Matthew, G. F., Illustrations of the 

 Fauna of the St. John's Group, 1882-93. — Woodward, H., Monograph of the British Carboniferous 

 Trilobites. Palaeontogr. Soc, 1883. — Hall, ./., and ClarU, J. M., Palaeontology' of New York, 

 1888, vol. \\\. — Walcott, C. D., The Fauna of the Lower Cambrian or Olenellus Zone. 10th Ann. 

 Rept. U.S. Geol. Surv., 1890. — ,/aekel, 0., tjber die Organisation der Trilobiten. Zeitschr. Deutsch. 

 Geol. Ges., 1901, vol. liii. — Lake, P., Monograph of British Cambrian Trilobites. Palaeontogr. 

 Soc, 1906-1913. — Lorenz. T., Beitrage zur Geologic und Pahiontologie von Ostasien, der Provinz 

 Schantung, etc. Zeitschr. Deutsch. Geol. Ges., 1906, vol. Iviii. — Monk, H., Beitrage zur Geologic 

 von Schantung. Jahrb. Preuss. Geol. Landesanst. Bergakad., 1905, vol. xxiii. — Moberg, J. C, and 

 Segerberg, C. 0., Bidrag till Kannedomen om Ceratopygeregionen med Siirskild Hansyn till dess 

 Utveckling 1 Fogelsangstrakten. Acta Universitatis Lundensis, 1906.- — Olin, E., Om de Chasmops- 

 kalkeu och Trinucleusskiffern Motsvarande Bildningarne 1 Skiine. Acta Universitatis Lundensis, 

 1906. — Raymond, P. E., The Trilobites of the Chazy Limestone. Annals Carnegie Mus., 1905, 

 1910, vols, iii., vii. — Idem, and Ka.rraway, J. E., Notes on Ordovician Trilobites. Ibid., 1906, 

 1910, vols. iv. , vii. — Reed, F.R. G., Lower Palaeozoic Trilobites of the Girvan District. Palaeontogr. 

 Soc, 1903-1 906. ^/f?e?*(-, The Lower Palaeozoic Fossils of the Northern Shan States. Burma. 

 Palaeont. Indica, 1906. — Idem', The Cambrian Fossils of Spiti. Palaeont. Indica, 1910. — Walcott, 

 G. D., The Cambrian Faunas of China. Proc U.S. Nat. Mus., 1906, and Smithson. Misc. Coll., 

 vol. xxix., 1911. — Idem, Cambrian Trilobites. Geology and Paleontology. Smithson. Misc. Coll., 

 1908-11, vols, liii., Iv. — Weller, S., Paleontology of the Niagaran Limestone in the Chicago Area. 

 Bull. Chicago Acad. Sci., 1907,' no. 4. 



B. Structure and Appendages : Burmeister, H., vide supra, 1843. — Billings, E., Notes on 

 some Specimens of Lower Silurian Trilobites. Quar. Jouru. Geol. Soc, 1870, vol. xxvi. — Woodward, 

 II., Note on the Palpus and other Appendages of Asaphus from the Trenton Limestone in the 

 British Museum. Quar. Journ. Geol. Soc, 1870, voL xxvi. — Walcott, G. D., Preliminary Notice 

 of the Discovery of the Natatory and Branchial Appendages of Trilobites. 28th Rept. N.Y. State 

 Mus. Nat. Hist., 1875. — The Trilobite ; New and Old Evidence relating to its Organization. Bull. 

 Mus. Conip. Zoology, 1881, vol. viii.— iVom^, 0., Studienan Hypostomen biihmischen Trilobiten. 

 Sitzungsber. Bohm. Ges. Wiss., Jahrg. 1879, 1886. — Clarke, J.M., The Structure and Development 

 of the Visual Area in the Trilobite Phacops rana Green. Journ. Morphology, 1888, vol. ii. — 

 Matthew, W. D., On Antennae and other Appendages of Triarthrus beckii. Amer. Journ. Sci., 1893, 

 (3), vol. xlvi.— JSeecAer, C. E., On the Thoracic Legs of Triarthrus, ibid., 1893.— On the Mode 

 of Occurrence, and the Structure and Development of Triarthrus becki. American Geologist, 1894, 

 vol. xiii. — The Appendages of the Pygidium of Triarthrus. Amer. Journ. Sci. 1894 (3), vol. xlvii. 

 — Further Observations on the Ventral Structure of Triarthrus. Amer. Geologist, 1895, vol. xv. — 

 The Morphology of Triarthrus. Amer. Journ. Sci., 1896 (4), vol. i. — Structure and Appendages 

 of Trinucleus, ibid., 1895. — -Studies in Evolution, New York, 1901. — The ventral integument of 

 Tribolites, Amer. Journ. Sci., 1902 (4), vol. xiii. — Lindstrom, G. Researches on the Visual Organs 

 of Trilobites. Svensk. Vet. Akad. Handl., 1902, vol. xxxiv, 



C. Ontogeny : Barrcmde, J., vide supra, 1852. — Beecher, G. E., The Larval Stages of Trilobites. 

 Amer. Geologist, 1895, vol. xvi. —Matthew, G. F., Sur le developpement des premiers Trilobites. 

 Ann. Soc. Roy. Mai. de Belgique, 1889, vol. xxiii. — vide ante, 1882-93. 



D. Systematic Position : Zittel, K. A., Handbuchder Palaeontologie, 1881-85, vol. iii. — Grundziige 

 der Pahiontologie, 1895. — Lang, A., Text-book of Comparative Anatomy, English Translation by 

 H. M. and M. Bernard. 1891. — Kingsley, J. S., The Classification of the Arthropoda. Amer. 

 Nat., 1894, vol. xxviii. — Bernard, H. M,, The Systematic Position of the Trilobites. Quar. Journ. 

 Geol. Soc, 1894-95, vols. 1., li. — The Zoological Position of the Trilobites. Science Progress, 

 1895, vol. iv. — Woodward, H., Some Points in the Life-History of the Crustacea in Early Palaeozoic 

 Times. Quar. Journ. Geol. Soc, 1895, vol. li, — Haeckel, E., Systematische Phylogenie der 

 wirbellosen Tiere (Invertebrata), 1896. — Beecher, G. E., Outline of a Natural Classification of the 

 Trilobites. Amer. Journ. Sci., 1897 (4), vol. iii. 



E. Classification: Barrandc, J., vide stqyra, 1852. — Beecher, G. E., ante, 1897. — Brongniart, 

 A., ante, 1822. — Burmeister, II., ante, 1843. — Corda, A. J. G., and Hawle, J., ante, 1847. — 

 Haeckel, E., ante, 1896. — Dalman, J. W., Om Palaeaderna eller de sa kallade Trilobiterna 

 Stockholm, 1826. — Milne Edivards, H., Histoire naturelle des Crustaces, 1834-40. — Quenstedt, 

 F. A., Beitrage zur Kenntniss der Trilobiten. Wiegmann's Archiv fur Naturgesch. , 1837, vol. iii. 

 — Emmrich, H. F.,I>e Trilobitis. Dissertation, 1839. — Zur Naturgeschichte der Trilobiten, 1844. — 



