61 
wlio lias referred to this coral, so far as I can ascertain, is W eissermel , 1 who 
does not throw any further light on its structure or relations. It is evidently 
related to Tryplasma, hut from want of knowledge I am not able to pursue 
the matter further. 
One last point remains to be referred to. It is highly probable, as 
Lindstrdm points out , 2 that some at least of the small simple corals placed in 
Turbinolopsis and Petraia are referable to Tryplasma ( Pholidophyllum ). 
lie mentions one species, Turbinolopsis ( Petraia ) bina, Londsdalc, Phillips, 
McCoy, &c. 
1 Weissermel — Zeitsch. Deuts. Geol. Gesellsch., 1894, XLYI, Heft .3, p. 637- 
2 Lindstrom — Bihang K. Sv. Vet.-Akad. Handl., 1882, VII, No. 4, pp. 65-66. 
