FOSSIL CORALS AND POLYZOA. 59 
are other peculiarities which I will notice in the diagnosis; it is 
su 
ient all attention to the singular beauty of the 
design of these corals. They m rviceable as 
designs for ornamental purposes, a ss ote which has more 
than once been made with regard to other members of this order. 
ste in which this fossil occurs are so little explored. I propose 
e the genus from its perforated aspect Trematotrochus, 
which i is i ie characterized :-— 
TREMATOTROCHUS, new genus. 
Corallum free, with the visceral chambers free, the = distinct, 
only united in the m iddle, pali present; no endotheca or synap- 
ticule and the wall incomplete, so as to leave mies interstices 
at regular intervals. No epitheca. TREMATOTROCHUS FENES- 
TRATUS. Corallum, a regular cone, cylindrical, finely pointed, 
without trace of attachment. seh in three cycles, the third order 
branching off very close to the base, rather prominent, thin and 
closely covered with short blunt chin GRO RE Marginal 
edge of ealice rounded. No fossa. han ge sert in rounded lobes 
rath nular process 
not rising so high as the septa. In addition the septa sometimes 
send out long narrow lobes such as recall the Astrangiacee 
is one athe of costa more than the septa. I have Tay r the 
plate which accompanies this a remarkable fossil from Adie: 
which has a structure mise may — a light upon this pecu- 
In Trochocyathus heterocostat 
while the costa corresponding to the primaries and tertiaries 
appear until abou t half way. ‘The fourth and fifth er of 
