pale, MINNESOTA BOTANICAL STUDIES. 
The author expresses his deepest thanks to Professor Conway 
MacMillan and Miss J. E. Tilden, who cared for him very 
kindly in every way during his stay at their private station; and 
to Professor J. Matsumura, of Tokyo, who offered many valu- 
able suggestions on this work. 
SyNOPTICAL Kry oF CORALLINZ ENUMERATED IN THE 
PRESENT PAPER. 
A. Conceptacles wart-like protuberances, on a surface of an articulus. 
o. Branches not pinnated. 
a. Articuli cylindrical.....Amphiroa cretacea {. tasmanica. 
&. Articuli of the upper and the middle portions cylindri- 
cal, subcompressed or compressed. 
Amphiroa tuberculosa. 
c. Articuli of the upper and middle portions approximate, 
with depressed wings........ Chetlosporum californicum. 
oo. Branches pinnated. 
a. With short and thick stipes; upper articuli of the 
branches cordate or sagittate with round lobes; external 
margins of the ultimate articuli thick. 
Chetlosporum frondescens. 
6. With long and thin stipes; upper articuli of the branches 
sagittate with acute lobes; external margins of the ulti- 
mate articuli thin............... Checlosporum plantusculum. 
c. With long and thick stipes; articuli of the axial branches 
hexagonal, without evident rib; conceptacles sometimes 
stallkedits fom catih cn sictcnemec terre Chetlosporum MacMillant 
B. Conceptacles stalked, taking place of segments. 
o. Branches regularly pinnated, flabellate. 
Corallina officinalis var. chilensis. 
oo. Branches irregularly pinnated, several pinnules around the 
top of an articulus. 
a. Pinnules not confusedly ramous. 
Corallina vancouveriensts. 
4. Pinnules confusedly ramous and prickly. 
Corallina aculeata. 
HABITAT OF CORALLINZ AT PorT RENFREW. 
The coast near the Minnesota Seaside Station chiefly consists 
of sandstone beds spreading horizontally. The beds are coy- 
ered with water at high tide, and drained at low tide, leaving 
a good number of pools. The Coralline are mostly found 
iis 
