Covdlhiiii in F. J'i>rh('st\ rur. occidciildlls. — (iirfii. 143 
relationship of A iiloixira , filtlioui>;li Siirlniioiiord i:> referrcil t<) 
the I'erfordfd^ and Si/riiu/opora lii^ewise passes throuj^li an 
Ai(lo/)or(f stage in which the whole colony is prostrate and at- 
tached. On the other hand, although the genus Anlopord. 
bears an outward resemblance to certain forms among the 
AU-jioiKi rid with which group it has been customary to ])lace 
it, the cell walls in such colonies are characteristically I'tu'ined 
of consolidated spicules, while .l/^/oy>o;7/ shows no trace of 
such structure. Aulojiord cannot strictly be called a perfor- 
ate coral, unless the creeping stolons*- are equivalent to the 
aerial stf)lons of Sf/n'tu/o/xird, which are homologous with 
pores. The corallites of Atilopord are seldom adjacent, but, 
when at rare intervals the}'^ are found in contact, this feature 
has not been investigated. As the corallum in Fdrositcs, if 
spread laterally and distributed along a plane, can be likened 
to an auloporoid colony, so, if continued upward aiul loosely 
constructed, it woidd correspond to a romingerioid colony. 
This would be especially true of the primitive form assumed 
for Fd cosih's^ in whicli the l)uds are developed in a complete 
verticil. It may be that Fdrosiles and HoiiiiiKjcrid have a 
common ancestry, and that while the open construction of the 
corallum in the latter genus i)ermitted the individuals to re- 
tain their symmetrical s^^stem of budtling, Farosili's assumed 
a compact mode of growth and became unilateral. 
Vdlc f'in'fcrsi/i/. Xeii- Ihiren, Cuini.. Aiiri/ J'j. IS'J.'^. 
KXTbAXATloX oF Pl.ATKS. 
IM.ATK VII., 
FrcriiKl. All init ial cni'allilc i>f /''"'■"•v//''.-< ./'"/•/"•■s/ which has ikiI ih-- 
vi'lupcd hiuls. Lalcral aspect. X 1. 
l''iori!K :2. Tlic same. \'ic\v nf llir calyx. XL 
l'"i(;ini': ;■.. Fi(ri)sit(s fiirhixi. 'I'lic yoiiniiesl ciiliiiiy round, in wliich 
l)iil two l)ii(ls lia\i- l)i'i'ii dc\rl()|ic(l of the lour whicli usually n-pi-esenl 
tile second ;:-eneral ion. XL 
FkH'HK L 'I'lle oI lier side of tile ai)0\e. xl. 
Fiiniii'; •"). Tlie same specimen seen from aho\e. ^howini:- plan of liie 
et)ioiiy. X 1. 
FiGUKE (5. A sijecimeii of Faeimtes forbe/ii vLii;\.c\w<\ to llie ;^eiial spine 
*Tlie procumbtMit attitmle of Anlo/xmi seems to hv directly associaled 
with the dili"us(> structure of the colony in that f^eiiiis. 'I'lie stolons in 
Si/riiif/ojxira and the verlicillate syst<'m of huddiiiir in Uniiiiidjiriii iJiiis- 
tratc; two modifications by wliich this type of structure is enabled to 
prolonu- and maintain its e-rowih \erticaliy. 
