382 
VINE: KOTES ON FOSSIL POLYZOA. 
ticulipora, whether with the Tabulate Corals, or with the peculiarly 
" stony " Pulyzoa of Mesozoic ag-e. 
For the sake of younger students who may not be able to get 
at the works I have referred to in this paper, I define the terms used 
by me in the description of typical features, &c. 
1- — CoRALLUM* : The whole of the specimen, whether large or small, ramose, 
massive, or encrusting. 
2. — C ALICE OR CoRALLiTES? : The superficial openings found abimdanth^ on 
the surface of the Corallum. 
3. — lyxERSTiTiAL TUBULES OR OPEXiXGs : Spaces, &c., between the Calices, 
occupied occasionally by smaller openings. — " Osti- 
oles " ? Phillips. 
4. — Monticules: Areas on the Corallum more or less elevated above the 
general surface ; Corallites large. 
5. — Macule: Areas in which the Coralhtes are smaller than the average, 
level or depressed. 
If I were describing species of Pol^'zoa the terms used would 
be 1 , ZoARiUM ; 2, Z0.ECIA (3, 4, 5). In true Polyzoa there are 
no structures, superficial or otherwise, at all resembling these. 
Typical structures of Phillips' Yorkshire Species. 
PI. XX., Fig. 1 ("a) Natural size of Yorkshire specimen. 
I. Walls of tilt Calices. — These are variously thickened, but the 
general characters of the whole are similar. Taking the calice and 
the walls together, I jSnd in the Yorkshii e specimen the following 
special features. Calice slightly oval, the inner walls of which slope 
gently inwards towards the floor of the cup. Surrounding the 
thickened rim of the calice there are numerous blunt spines var^ang 
in number from nine to eighteen (PI. XX., Fig. la). In tliis respect the 
character of the calice and its surroundings are similar to the Redes- 
dale specimen figured by Nicholson (Monticulipora pi. III., fig. Ic.) 
(See Nicholson on the Structure of the walls of the Corallites, op. 
cit, p. 36, et. seq.) 
II. Interstitial tuhuli. — These also are variously shaped, and 
are occasionally surrounded by a similarly thickened rim as in the 
normal calice, and partly surrounded by spines ; but from four to 
five only (PI. XX., Fig 1, b\ b^). These interstitial tubuli are important 
features in the Corallum of species of Monticulipora, and we have 
no analagous structures in the Zoarium of true Polyzoa, excepting 
* All these terms must be taken in a popular, rather than in a strictly 
zoological sense. 
