8 
La 
I have some reason to believe that a large specimen can ^ 
formed under favorable circumstances, in the course 
fourteen days. In the smaller species, a transient cessa ' ^ 
of growth takes place at the various septa ; at these p*j ,D 
the pulp gets enlarged, and in the Sea Oak, S. pumila, w ‘ ,e ] . s 
the two cells and stem are formed simultaneously, it app®* 1 ^ 
as one very great enlargement, At first this enlarged® 
of the pulp is undistinguished by parts or markings, w > 
is however but of short duration, for three dark P°' i 
appear on the pulp indicating the situations of the cen ^ 
pith with a polype on either side. The concentration , 
organization proceeds from below upwards, and the ' ‘ 
spots become more and more defined and separated 1 ^ 
each other, the formation of the polype and cell being ^ 
described above. The extremities ot the pinnas and t/t 
arc closed during growth, and not open, as some author 1 
have stated.* The growth certainly takes place rapidly, & 
chiefly about summer and autumn. In a specimen ot 
Sertularia argentea, now before me, a shoot of six in® 
has taken place, which is of a pure silvery white, while # 
lower and older portion is of a light brown colour. .j, 
cross section of the stem of the new part, the. horny she ' 
was found to be of equal consistence throughout, and ^ f 
delicately spongy or cellular; in a cross section of the 
stem the texture was not so elastically spongy, but h'J r ‘ 
and firmer, more especially towards the inner circumferc 
of the ring, where there was a brown zone occupying nea 1 
one half the diameter, as if a solid material had been ‘ 
posited in the intercellular substance, or the cells had 
more closely pressed together. As another instance oat 
many, of the rapidity of growth in these creatnres, in a 
cimen of the compound variety of the great tooth Coral*' ^ 
( S. polyzonias) about eight inches high, an egg ot ^ 
Rough Hound, ( Sqvalus canicula.) has been deposited, an ^ 
its tendrils has twined round the branches and bound * '^[j 
into one large clump; tbrongh the folds however 
shoots have sprung out in such great abundance as compl e ‘ , t 
to hide the ovum from sight, unless the branches are ^ 
turned aside. On examining the ovum no advanceme 0 ^ 
developernent had taken place ; the cicatricula having ,, 
same appearance as those taken from the animal. { e 
this specimen being taken at the time at which the fish ' u 
depositing their ova, it is probable, that it had not long “ ^ 
shed. In another instance, several very good specimens 
same Coralline mixed with Plumularia cristata and P - /<*? 1 
were growing on the case, but its contents had escape ’ 
Jones’ Outline of the Animal Kingdom, p. 47. Grant, & c ' 
