MARINE ALG OF BEAUFORT, N. ¢. 533 
TABLE 9.—SURFACE TEMPERATURE OF WATER AT 5 P. M. OFF LABORATORY WHARF, BEAUFORT, N.C. 
[Expressed in degrees centigrade.] 
1912 1913 I9I4 
Month. A xe i 2. 
Maxi-.| Mini- | Aver- | Maxi- | Mini- | Aver- | Maxi- | Mini- | Aver- 
mum.} mum.{ age. | mum./mum.! age. | mum.| mum,| age. 
February 
October... 
November. 
December 
@ Record available for only part of month. 
ARTIFICIAL KEY TO GENERA. 
A. Color bluish green or blackish, sometimes grayish green or tinted with other colors; single 
celled or composed of rather short filaments; attached or floating; forming small tufts 
orrather gelatinous, feltlike masses over considerable areas of the substratum. .I. MYXOPHYCE. 
a. Plants unicellular, cells living aaa or a few associated in small ill-defined families 
..CHROOCOCCUS (p. 408). 
aa. Plants multicellular, filamentous.. bach ae ea eR at cremanae ete te td ie sl cee ety nie ae TEN d. 
b. Filaments tapering at apices into multicellular hairs......................DICHOTHRIX (p. 416). 
Ober Bilamresits mot ra peru tO Mains al APICES ee eiop sa cepa 5 eye tials Sele eye Nagai e nus) diyn asin aoa gts ages aah Ge 
feted hl es aUEE HY SS}iy vel] 0) EVE G1 eC ba ae Bye A APE At es A A EPR Se a ei lA d. 
(bs PRICE SIAC Et pr SHCA CIN rete Er Sanna cc aprtanc ea he ie Geese mire seta thse loeare eae e. 
e. Filaments, multicellular, elongated, soo or curved at the apices, not 
spirally twisted. . AP Reesist .-OSCILLATORIA (p. 410). 
ee. Filaments Piicetinlas’ ehort, twisted Fit a iene more or ie lax spiral 
.. SPIRULINA (p. 411). 
dd. Filaments ie death. . Ripe ereat seen siete ste Nias scat aie ond: diaraie authori lethe, eit eatictaes aches weretstel Cree sf 
7.” Wilantents possessitis “Heterocysts oo eos ces pee ee ce etna gs ane MICROCHATE (p. 414). 
Sf feme Tl ARH ERL ES LACE TNE TNELCTOCUSES te ee conc a is ciais sas, clare! fronyeyalalelniereaeotslea p essipna eesiereete siete g- 
g. Filaments composed of several trichomes in each sheath.........MICROCOLEUS (p. 413). 
gg. Filaments composed of single trichomes in separate sheaths...................-... h. 
hawilamentsabouter mic. diameter oy oe cya gee en css PHORMIDIUM (p. 4IT). 
hh. Filaments more than 1 mic. in diameter........................ LYNGBYA (p. 411). 
