INTRODUCTION. HI 



1910. 



Arnold, Ralph, and Anderson, Robert, Geology and oil resources of the Coalinea district, Cal.: U. S. Geol. Survey- 

 Bull. 398, pp. 1-354, Pis. XXIII-LII, 1910. 



Clare, W. B., and Twitchell, M. W., Geological distribution of Mesozoic and Cenozoic Echinoderrnata of the United 

 States: Geol. Soc. America Bull., vol. 20, pp. 686-688, 1908. 



Graeau, A. W.j and Shimer, H. W., North American index fossils, invertebrates, vol.2, 909 pp., 726 figs., 1910. 



Lambert, J., Echinodermes: Rev. crit. paleozoologie, vol. 14, No. 1, pp. 42-55, 1910. 



1911. 



Lambert, J., Echinodermes: Rev. crit. paleozoologie, vol. 15, 1911, p. 64. 



Stefanini, G., Sugli echini terziari dell' America del Nord: Soc. geol. italiana Boll., vol. 30, pp. 677-714, PI. XXII, 

 Rome, 1911. 



Osservazioni sulla distribuzione geografica, sulla origini e sulla filogenesi degli Scutellidse: Soc. geol. italiana 



Boll., vol. 30, pp. 739-754, 1911. 



Note echinologiche : Revista italiana di paleontologia, vol. 17, pt. 4, pp. 1-16, PI. V, 1911. 



Note. — A number of contributions have appeared during the progress of this report through the press, the results 



of which can not be fully incorporated in the following pages, although footnotes concerning some of them have been 



inserted. Among the more important of these publications are : 



Pack, R. W., Notes on Scutella norrisi and Scutaster andersoni: California Univ. Dept. Geology Bull., vol. 7, No. 13, 

 pp. 299-304, PL XV, 1913. Pack furnishes additional information of value regarding the species mentioned. 



Kew, W. S. W., Tertiary echinoids of the Carrizo Creek region in the Colorado Desert: California Univ. Dept. Geol- 

 ogy Bull., vol. 8, No. 5, pp. 39-60, Pis. I-V, 1914. Kew describes the following forms: Encope tenuis n. sp., 

 Clypeaster deserti n. sp., C. carrizoensis n. sp., C. bowersi Weaver, Hipponoe californica n. sp., and Cidaris sp. 



