116 
DEPTH AT WHICH 
Cn. IV. 
the accumulation of small organic bodies into great 
masses . 1 Every fact in geology proclaims that neither 
the dry land nor the bed of the sea retains the same level 
for indefinite periods. As well might it be imagined 
that the British seas would in time become choked up 
with beds of oysters, or that the numerous small coral- 
lines off the inhospitable shores of Tierra del Fuego 
would in time form a solid and extensive coral- 
reef . 2 
1 [This remark has, by anticipation, a direct bearing on an 
important part of Mr. Murray’s hypothesis. See Appendix II.] 
2 I will here record the few facts which I have been able to collect 
as to the depths, both within and without the tropics, inhabited by 
Depth 
NAME OF ZOOPHYTE. 
in 
fathoms. 
S. LATITUDE. 
AUTHORITY. 
Sertularia .... 
40 
Cape Horn GO 
[Where none 
Cellaria 
ditto 
ditto 
is given the 
,, A minute scarlet en- 
observat' is 
crusting species, found 
living .... 
100 
Keeling At. 12 2 
my own.] 
„ An allied, small stony 
sub-generic form 
48 
S.CruzRiv. 50° 
A coral allied to Vincularia, 
with eight rows of cells 
40 
Cape Horn 
Tubulipora, near to T. patina 
ditto 
ditto 
Do. do. 
94 
East Chiloe43° 
Cellepora, several species and 
allied sub-generic forms 
40 
Cape Horn 
Ditto | 
40 
and 
57 
) ChonosArch. 
j 45° 
Ditto 
48 
S. Cruz 50° 
Eschara. .... 
30 
j Tierra del 
( Fuego 53° 
Ditto ..... 
48 
S. Cruz R. 50° 
Retepora .... 
40 
Cape Horn 
rQuoyandGai- 
Ditto ..... 
100 
i C. Good Hope 
1 34° 
j mard, Ann. 
j Scien. Nat., 
( t. vi. p. 284. 
