1875 
* Trochosmtlia , Duncan, Quart » Jour. 06 cl* Soc . London, vol 
xxix, p. 552, pi. xix, figs. 2, 2a, 5, (not 
Trochosiullia 1'ilne Bdv^ards & Haim© ) * 
Generic diagnosis : Coral Xum s Imp la , s ub c y 1 i. n dr leal or 
compressed* Ipitlieca entirely &b sent or rudimentary. Wall 
in mifii iFii~r composed of pseudo tile cal thickenings of the septa, or 
of dissepiments, it is mostly diaseplmental. In fact the dis- 
sepiments are so arranged as to give the appearance of an im- 
perforate wall in many if not most cases. Costae present, re- 
presenting the peripheral ends of the septa. The costae rather 
prominent and distant, with rather definite girdling exothecal 
rings, the dissepiments in these rings extending to the costal 
ends. Between the rings thinner dissepiments can often he seen 
Septa irregularly perforate, the first and second cycles thicker 
and not so perforate as the higher cycles, hut they nevertheless 
show distinct perf orations; in three polished sections I found 
