10 Rhodora [JANUARY 
discussion of details. Any attempt to enumerate the species accord- 
ing to the zones to which they are normal must necessarily take 
cognizance of this fact. This discussion has been intended only to 
deal with the relation of Cape Cod to the marine flora as a dividing 
line and I trust that this has been made even more definite than it 
has been demonstrated by previous writers. 
UNIVERSITY OF CALIFORNIA. 
BIBLIOGRAPHY. 
Collins, Frank S. 
1900. Preliminary Lists of New England Plants.—V. Marine 
Algae. Ruopora (Suppl. Material), pp. 41-52 (Feb.) 
1908. Notes on Algae, IX. RHoponma, vol. 10, pp. 159-164 
(Sept.). 
Davis, Bradley M. 
1911. "Section IL— Botanical," in “A Botanical Survey of the 
Waters of Woods Hole and Vicinity." Bull. U. S. 
Fish Comm., vol. 31, Part 1. 
Farlow, W. G. 
1881. Marine Algae of New England and adjacent Coast. 
Rept. U. S. Fish Commission for 1879. 
Harvey, William Henry. 
1852. Nereis Boreali-Americana, Part I. Smithsonian Inst., 
Mise. Contr., vol. 10. 
Setchell, William Albert. 
1893. On the Classification and Geographical Distribution of 
the Laminariaceae. Trans. Conn. Acad. Sci., vol. 
9, pp. 333-375. 
1915. "The law of temperature connected with the Distribution 
of the Marine Algae. Annals Missouri Botan. 
Garden, vol. 2, pp. 287-305. 
1917. Geographical Distribution of the Marine Algae. Science, 
n. s., vol. 45, pp. 197-204. 
1920a. The Temperature Interval in the Geographical Distri- 
bution of the Marine Algae. Science, n. s., vol. 52, 
pp. 187-190. 
1920b. Stenothermy and Zone-Invasion. Amer. Nat., vol. 54, 
pp. 385-397. : 
1920c. Geographical Distribution of the Marine Spermatophytes, 
Bull. Torrey Botan. Club, vol. 47, pp. 563-579. 
EXPLANATION OF PLATE 133. 
Atlantic Coast of the United States from West Quoddy Head, near Eastport, 
Maine, south and southwest to just beyond Cape Hatteras, North Carolina, 
based upon “Sailing Chart, No. 100" of the U. S. Coast and Geodetic Survey. 
The continuousline running in towards the shore are the surface the isotheres of 
v 
