48 
which the septal spines and septal lamellae should he perforated by canals, a 
supposition caused by the broken lower parts of the spines, I have proposed 
the new name .... based upon the peculiarities of the outer scales ” 
[exothecal structures of the preceding paragraph]. Lindstrom was unques- 
tionably correct in placing Dybowski’s Acanthodes as a synonym, both on 
account of its structure and, as he said, by preoccupation as the name of a 
fish ( Acanthodes , L. Agassiz). 
On the more important point, however, of the substitution of the 
name Pholidophyllvm for that of Tryplasmci , I formerly wrote as follows 1 : — 
“ I regret that I cannot agree with Dr. Lindstrom in the abolition of 
Tryplasmci. If every generic name in Palaeontology is to be abolished because 
an original misconception as regards its structure Avas made, few of the older 
genera Avould stand. Granting that a genus has been figured and described 
to the best of an author’s knowledge and the material before him, it seems 
difficult to understand how his work can be set aside. I therefore adopt 
Try plasma as typified by Lonsdale, and described by Lindstrom under the 
name of Pholidophyllum, Avith this exception — I believe that Palccocyclus 
should he eliminated from the latter.” 
The coral here selected by Lindstrom as the type of his genus AA'as the 
Tnbiporiles tubu/atus, Schlotheim, and a very full synonomy Avas given, 
inclusive of both species comprised by Lonsdale in his Tryplasma, and also 
Cyathophyllum (?) Loveni, previously referred to under Milne-Edwards and 
Haime an l Lindstrom (L870). This synonymy affords a very complete 
bibliography of the coral up to the date of publication of Lindstrom’s paper 
from his point of view, and will serve to amplify the historical references 
here giA r en. The corallum in T hoi i dophyllum tubulatum is described as 
compound, budding in quadruple divisions, but in this “ compound ” (or, as I 
Avould prefer to call it, “sub-compound”) growth Lindstrom recognised two 
conditions in the one species, the “ forma primaria ” and the “ mutatio.” The 
former is broad conical, the latter cylindrical, either fixed by anchoring 
rootlets extending from near the distal end of the corallum, or by the Avhole 
base ; the rootlets are either simply tubular or tabulate. The septal lamellae 
are of variable Avidtli, and of tAvo orders, forty of each, denticulated on their 
free edges, and granulated on the lateral faces ; there is no fossula. A wide 
central tabulate area is left, the tabulae vertically spined on their upper 
surfaces. Gemmation is calicular, four new corallites arising within the calice 
Etheridge — Rec. Geol. Survey N. S. AVales, 1890, II, Pt. 1, p. 15. 
