a a 
16 J. D. Dana on Zoophytes. 
rection of the cells in the front broken margin. The growth at 
the outer margin is of the stoloniferous kind, or takes place by 
Fig. 33. 
_ Gemmipora. £ 
gradual extension and gemmation. Such forms are termed 
explanate or foliaceous. 
57. A very different form results when 
budding takes place alternately from differ- 
ent sides of polyps growing a little obliquely. 
Thus in the annexed figures of Oculine, oe . 
the apical polyp gives out a bud, which fora. 2 
while is the summit polyp, and this bud an- = 
other in the same manner, and that another, | 
and so on, and in such an alternating, or pro 
erly spiral order, (figure 35a,) that a cylindri- 
cal branch is the consequence. This mode 
of branching may be called cumulato-ra- 
mose. 
_ This mode of development may also be 
considered as closely allied to that of the i 
stolon, since growth and budding is continuous. Indeed there 
is no important distinction of the stolon, excepting the one allu- 
ded to in § 48. | pene 
_58. 2. In the above instances the polyps have been supposed 
not to have acrogenous growth, or to possess it only in avery ; 
limited degree. When they are acrogenous, the results are vari- 
ous according to the mode of budding. If each polypas it grows  & 
goes on to bud, and all bud thus equally and indefinitely, only 
globular or hemispherical forms can result. This is exemplifie 
among the Porites: yet owing to slight irregularities or more 
rapid development in one part than another, the forms are usually 
irregularly glomerate rather than symmetrically globular. "When 
the polyps are not connate by their sides, (that is are segregate in 
growth, ) the same will still be the result, asshown in the Colum- 
hari, 'l'ubipore, and Caryophyllie.+ 
Figs. 34. 
* The Oculine are somewhat acrogenous, and thus the semi 
branches below becomes much greater than the height of a polyp 
t The Cladocorx of Ehrenberg. k gerea 
diameter of the 
