384 BULLETIN OF THE BUREAU OF FISHERIES. 
The southern character of the species occurring on this reef is further shown by 
the predominance of red alge. The total numbers found in the different divisions are: 
Number.| Per cent. 
My xophy cena, oi ois. Foleo Bee Te eee eee oka ale aa ae a Bria. ae eae SCR Ret INT Wak cial ate tehie cn Peds aie 2 3-8 
Chlorophycez PE 4 75 
TREMOR COINS ois Sic sata cs arate a fo cl aratatujoasralefereba ye tace eyeiminie el Siele WiSP ae ieyele, arcade slajeiaveysceretsi het efalatale e(hysteneter «fete 544 Ir 20.8 
Rhodophycez 36 67-9 
FLORA OF BOGUE BEACH. 
The flora which, in this locality, is found only on Bogue Beach (Table 3) is as 
pronouncedly southern as is that of the coral reef. Of the 18 identified species and 
varieties composing this list, 16 (88.8 per cent) are known from the Florida-West 
Indies region, while only four (22.2 per cent) are recorded for New England. ‘This 
relationship is again shown by the predominance of red alge. The total numbers 
found in the different divisions are: 
{ 
Number.| Per cent. 
Meyxophiyceses§ forfoo.. etter aoe See eee eke o UE oteld Borda ee Alldald Week teleed ate alialdaMatieleeihtkis Pee omonae haa I 4.6 
Chlorophycee. . | 4 13-6 
Pheophycee...... 7 31-8 
Rhodophyceze Ir 50.0 
These facts support the suggestion previously made that most of these specimens 
have been washed in from the coral reefs offshore or from the reefs lying to the south 
of this locality, while some may have been brought by the Gulf Stream from the Florida- 
West Indies region. 
CONDITIONS AT BEAUFORT, N. C. 
HARBOR. 
The principal factors affecting the growth and distribution of alge are temperature, 
light, composition of the water, turbidity, movement of the water (including tidal 
range), and the nature of the habitat. 
TEMPERATURE. 
The temperature of the surface water at the laboratory wharf (on Pivers Island) has 
been taken at 5 p. m. almost daily during three periods, totaling almost four years. A 
full statement of these figures is given in Table 9. A summary of the records, stated in 
degrees centigrade, is as follows: 
Change of Change of 
Maxi-) Mini-] Aver-|  9¥te8° Maxi-| Mini-| Aver-| “yirege 
mum.|mum.| age. Rae viol mum.|mum.| age. | previous 
month. month. 
tf SG: FG: a ee eG "GC, 
T5.5 5-0 9-8 31-0] 25-0] 27-9 +2.7 
16. 7 3-0 9-6 30-0] 23-0] 27-5 — 4 
19-5 3-0] 12.5 28.9] 17-8] 24.8 =e 
23-0 12-0 17-5 25-0 14-0 19-2 —5. 
26.7 18.0 22.4 20.0 7-8] 13-9 —5-3 
1 (oes paascstonr ceca: 2. go-0}] 17-0] 25.2 17-0 6.0] 11-1 —2.8 
