472 L. I). Burling— The Albertella Fauna. 



figs. 1 and 2. Figures of the three species so far described are 

 inserted here because Albertella deserves prominence as one of 

 the best horizon markers of the early Middle Cambrian. 



Geological Survey of Canada, Ottawa. 



Eeferences to the Literature. 



1. Bull. Geol. Soc. America, vol. xxvii, pp. 63 and 158, 1916. 



2. Geol. Survey Canada, Museum Bull. No. 2, pp. 120 and 128, 1914. 



3. Ibid., pp. 116-120. 



4. Walcott, Mon. U. S. Geol. Surv., vol. li, pt. 1, p. 168, 1912; local- 



ity 4V. 



5. " Smithsonian Misc. Coll., vol. liii, p. 214, 1908. 



6. " Canadian Alpine Journal, vol. i, p. 241, 1908. (p. 10 of 



reprint.) 



7. Idem, p. 214. 



8. Walcott, Eesearch in China, vol. iii, pp. 27 and 106, 1913. 



9. " Smithsonian Misc. Coll., vol. lvii, p. 338, 1913. 



10. Schofield and Burling, Geol. Survey Canada, Mus. Bull. No. 2, pp. 



82, 93, and 125, 1914. 



11. Adams, Bull. Geol. Soc. America, vol. xxvii, 1916, pp. 62 and 63 ; 



and Commission of Conservation, Discovery of Phosphate 

 of Lime in the Bocky Mountains, by Adams and Dick, 1915, 

 p. 13. 



12. Burling, Summary Kept. Geol. Survey Canada for 1915, pp. 99 and 



100, 1916. 



13. Idem. 



14. Idem. 



Art. XL VII. — Some New Forms of Natrolite ; by 

 Alexander H. Phillips. 



Some interesting specimens of natrolite were collected by 

 Mr. Edward Sampson in the Ice Valley region of British 

 Columbia. They were found along the contact of a nephelite 

 syenite and limestone. The crystals were very large and indi- 

 vidually developed, but forming reticular masses with angular 

 cavities. Individual crystals were 6 cm in length and 4 cm in 

 diameter. 



A second generation of small, water-clear crystals occurs 

 implanted upon the large individuals and terminating freely 

 in the angular cavities. The large crystals are milky and 

 translucent from inclusions. This second generation of small 

 crystals are very rich in crystal forms and with very bright 

 and perfect faces. On one crystal, although only a millimeter 

 in diameter and terminated at one end, 38 faces were measured, 

 representing 13 crystal forms. The large crystals are simple 

 in habit ; in the prism zone they are combinations of the unit 



