VINE : CLASSIFICATION OF THE PAL.^IOZOIC POLYZOA, 
48 
{(i) Corallum, composed of closely approximated tubular 
corallites. 
(/>) Walls of Corallites, never absolutely amalgamated, 
(c) Walls imperforate, and septa entirely wanting. 
{d) Tabulse always present, generally complete. 
{e) The presence of Monticules " and Maculoe " ; areas 
elevated and depressed. 
The above I consider a fair analysis of the Corallum, but Professor 
Nicholson has made us his debtor in his further studies of members 
of the group in his fresh contribution on the Genus FistuliporaM'Coy," 
by adding a useful working nomenclature of parts of the Corallum, 
which will supersede the terms used in his " Monticulipora," and 
Palaeozoic Corals." 
if) Autopores = " large corallites " of the above works. 
{g) Mesopores = " interstitial tubes " 
{h) Acanthopores = " spiniform corallites " 
(/) Corallites, only used in a general sense when referring to the 
tribes of which the colony is made up. 
As the true opposite of this nomenclature the following may be 
suggested as applicable to Polyzoa, and partially adopted from Mr. 
Hincks. 
I. Zoarium ( = Polyzoarium). The composite structure formed 
by repeated gemmation. 
II. Zooecium ( = cell). The chamber in which the polypi de was 
lodged. 
{a) Cell wall ornamented by foramina ( = punctures, Busk). 
III. Ccenecium = the common dermal system of a colony. 
IV. Ectocyst ( = ectoderm). The outer layer of the Ccenecium . 
{b) Ectocystal tubes. Tubes nominally ornamental of the 
Ccenecium, but which penetrate this layer, 
(c) Interectocystal tubes. Tubes horizontal to the Ectocyst. 
V. Endocyst. The inner layer ; valuable to the Pak^ontologist 
as a reference whenever the Ectocystal tubes penetrate the 
substance of the Endocyst. 
* Dr. H A. Nicholson and A. H. Foord. Ann. Mag. Nat. Hist. Ser. v., Vol. xvi., 
pp. 49G-517, 
