GUIDK TO THE FOSSIL INVEKTEmiATE ANIMALS. 
Gallery X. 
Table-case 
- 8 . 
Table-ease 
7. 
52 
Ciuboniterous .species (Tal)le-case o). Here the tubes are 
separate, but connected by cross-can ahs, and the tabulae are 
funnel-shaped (Fig. 22, h). The living alcyonarian, Clavn- 
laria, has a tulnilar skeleton with .similar ciuss-canals, and 
the organ-pipe coral, Tuhipora, has tabulae either flat or 
funnel-shaped and cross-canals running in the flat expansions 
that connect the tubes; therefore many place Syringopora 
and the Favositidac with these Alcyonaria. In all these 
genera the tubes of each colony are of equal size, and doubt- 
less contained equally developed polyps. On the other side 
of this Case is Jleliolites (sun-stone), in which the surface 
shows openings like little suns surrounded by smaller circular 
openings ; in section the colony is seen to be formed of 
tabulate tubes of two sizes. Ileliolites and its allies are 
explained by reference to Heliopora (.see Table-ca.se 1), a 
living Alcyonarian, in which the larger tubes contain com- 
plete polyps, and the smaller ones contain simple sacs of 
tlie common flesh of the colony. Halysites, the chain-coral 
(Fig. 21 a, h), consists of tabulate tubes, flattened, and joined 
a be 
Fici. 21.— Silurian Anthozoa, possibly Alcyonaria, from the Wenlock Lime- 
stone of Dudley, a, Halysites catena lari us, natural size; b, some of 
its tubes seen in section, to show the tabulae, slightly enlarged ; c, Aulo- 
2>o)-a, growing on a shell, enlarged § diameter. (From specimen R 20C7 , 
Table-case 8.) 
by their edges, with no connecting pores ; in some species 
all tubes are of equal size, in others some tubes are much 
smaller ; it is probably an Alcyonarian. Aulopora, apparently 
an ally, gi'ows in a low network over shells and corals 
(Fig. 21 c). A slab of Silurian limestone from Gotland, 
between Wall-cases 5 and 6, is largely composed of Favosites 
and Haly sites. 
In the next Case are Silurian Zoantharia Kugosa or 
Tetracoralla. Here come the conical Omphyma with root- 
like supports fFig. 22 a), the broadly spreading cups of 
