149 
G. W. Lee — Trepostomata. 
angles of adjacent zocecia. Tabulas complete, scarce to numerous. Carboniferous to 
Permian (?). Genotype: Stenopora tasmaniensis Lonsdale. 
As regards the systematic position of Stenopora , it would be inconsistent to leave it 
in the family Batostomellidae Ulrich, since all the members of that family have perforated 
tabulae. On the other hand it agrees in most respects with the definition of the family 
Amplexoporidae Ulrich ; therefore it is here suggested that it be tentatively regarded 
as an aberrant genus of that family, characterized by a strong tendency to the 
development of beaded walls. 
Stenopora as defined includes Australian and Indian species, and the British fauna 
contains forms which agree in most respects, the only difference being that the black 
divisional line is here either inconspicuous or absent. But from the figures of 
Etheridge and of Waagen and Wentzel, it appears that the black line is sporadic even in 
the typical species, so that its absence in the British forms ought not to warrant their 
removal to a new genus until more is known of the conditions which affect the degree 
of visibility of this particular feature. At the same time it is admitted that the 
attribution of British Lower Carboniferous forms to a genus erected for the reception of 
Australian Upper Carboniferous or Permo-Carboniferous species, may some day be shown 
to be wrong, since the characters common to the species of these two provinces might be 
due to convergence. It will however be conceded that pending conclusive proofs to the 
contrary, the most convenient course is to regard the Australian and British forms as 
congeneric. 
Genus Tabulipora Young. 
It will be seen from the above description that a number of species described 
as Stenopora cannot be united with this genus, since they have perforated tabulae. 
That such species should be removed to another genus has been recognized by 
Mr. Etheridge, 1 who proposes to revive Young’s genus Tabulipora. The erection of 
this genus for the reception of the common Scotch Stenoporoid, “ Ure’s Millepore,” was 
certainly justified, but owing to the misconception regarding the true characters of 
Lonsdale’s genus, Tabulipora has generally been regarded as a synonym of Stenopora. 
Since Young did not give 2 a condensed diagnosis of his genus, but a description 
of the species for which he erected it, a diagnosis based on Young’s materials and on 
•congeneric species is given as follows :— 
Zoaria generally forming solid or hollow branches, or parasitic, sometimes laminar. 
7, p. 47. 
2 50, p. 154. 
