T. insignis 
-3- 
- ' A H=4 
PI. figs. 
1873. Trochos milia insign is , Duncan, Quart. Jour. G-eol. Soc. 
London, Yol. XXIX, p. 552, PI. XIX, figs. 2, 2a. 
The following is Duncan’s original description: 
"The corallum is tall, cylindrical above, and curved 
inferiorly. Superiorly it is slightly compressed, and inferiorly 
decidedly so, close to the broad scar of the former adhesion. 
Transverse sections near the calicular termination exhibit 
nearly circular outlines. 
The wall is thin; the costae are subequal, distinct, sharp, 
not crovfded, and they enlarge where the exotheca comes in contact 
with them. Near the calice rudimentary costae exist. 
The septa are thinner than the costae, and are wavy. 
There are six systems, and five cycles in each system, the fifth 
