200 A. #, Verrill—The Bermuda Islands; Geology. 
and red-clay layers, resulting from decomposition. It contains at 
least 10 species and 3 varieties of land shells, of which 3 species and 
| marked variety are extinct. 
It corresponds with the period of reélevation on the American 
coast. There is some evidence, in the submerged hard limestones 
containing marine fossils, that there has been a period of subsidence 
of small amount, during this period. 
Bibliography: List of the Principal Works on the Geology and 
Paleontology of Bermuda. 
Agassiz, Alecander.—Notes from the Bermudas, Amer. Journ. Science, ser. 3, 
xlvii, June, 1894. 
A Visit to the Bermudas in March, 1894, Bulletin Mus. Comp. Zool., xxvi, 
No. 2, pp. 209-281, with a map and 50 plates, 1895. 
Contains detailed descriptions of the reefs, reef-fiats, serpuline atolls, sounds, 
etc. 
Bermuda Pocket Almanac. Hamilton, Bermuda. 
Bermuda, Geological Description of, by Williams, W. F. Volume for 1850, 
pp. 60-64. 
Rainfall on the north side of Pagets for 10 years. Volume for 1875-1884 ; 
reprinted in later years, 1888-1897 ; volume for 1898, p. 280. 
Jones, J. M. —On the Geology of Bermuda, abstract from his article in Proc. and 
Trans. Nova Scotian Inst., 1873, pp. 237-280. 
Also abstract of Thomson’s article in Nature, July, 1878. Volume for 1874, 
pp. 58, 60. 
Bartram, J. T.—Lists of the Shells of Bermuda. Volume for 1875; reprinted 
with additions in later volumes down to 1881. Includes some fossil species. 
Description of a Stalagmite taken from a Walsingham cave. Reprint from 
D. M. Home, in Proc. Royal Soc. Edinburgh, v, p. 423. Volume for 1888, p. 
175; 1889, p. 149. 
Bigelow, Henry B.—The Shoal-water Deposits of the Bermuda Banks, Proce. 
Amer. Acad. of Arts and Sciences, xl, No. 15, pp. 559-592, 1903. Cont. 
from Bermuda Biclogical Station, No. 5. 
Bland, Thos.—Ann. Lye. Nat. Hist. New York, xi, p. 78, 1875. Describes fossil 
Hyalina Nelsoni (as var. of H. Bermudensis). 
Creak, E. W.—Repozt on the Magnetical Results obtained by H. M. 8. Challen- 
ger during the years 1873-76. Pt. 6, vol. ii, 1889. Two maps. ‘“‘ Magnetic 
disturbance was found at three stations in the eastern parts of the 
islands,”—p. 4-5. 
Dana, James Dwight.—Corals and Coral Islands. New York, Dodd & Mead, 
1872. (2d edition, 1874; 3d ed. 1890.) 8°, 398 pp. 
Note.—Structure of the Bermuda Islands [with map], pp. 218-221; 218-226, 
ed. 3; former extent, p. 370; 408, ed. 8; caverns, p. 361, ed. 1, 2; p. 398, ed. 3. 
