150 
G. W. Lee — Trepostomata. 
Surface even or with, maculae. Zooecia-walls periodically thickened in certain species, 
uniform in others. Acanthopores present. No mesopores, but a small cell is sometimes 
present between adjacent zooecia. Tabulae present in all the typical species, always 
perforated. Genotype: Tabulipora scotica sp. nov. [ = Tabulipora urei Young (pars)]. 
Carboniferous. 
" As explained later, the specific name “ urei ” is not retained here for Two reasons. 
The first is that Young did not really propose it as a new specific name, but assumed 
his materials to be conspecific with Fleming’s Cellepora urei and as Fleming’s 
type, i.e. lire’s “ Millepore,” is lost, the .retention of the name would imply specific 
identity, and this cannot be proved. The other reason is that Young’s materials include 
several species, and as he gave no figures it is impossible to select one as the type 
with the specific name proposed by Young. But, fortunately, all these species are 
undoubtedly congeneric, so that the identity of the genus is fully established. 
The genus Tabulipora possessing the characters formerly attributed to “• Stenopora ” 
of authors (non Lonsdale), it naturally falls in the family Batostome'llidae, where 
“ Stenopora ” was placed by Ulrich. 
The British species described here as Tabulipora axe. divisible into two groups 
or sections, characterized the one by the central or sub-central position of the 
perforation, the other by its lateral position. Were future investigations to- prove that 
these two types, of structure are the result of different lines of development, a new 
generic name would have to be proposed for the second section, but such a step is at 
present not necessary. 
As regards the structure of the walls, the Scottish materials conclusively prove 
that in this genus the periodical thickening has at most specific value only, insensible 
gradation being observable on the same slide between strongly beaded walls and walls 
of uniform thickness. 
Genus Batostomella Ulrich. 
This was erected in 1882, 1 and diagnoses have been given from time to time. 
The following is transcribed from Nickles and Bassler’s “ Synopsis 2 ” :— 
“ Zoarium ramose, branches slender; zooecia with, few diaphragms; apertures of 
zooecia small, circular or oval ; interspaces rounded or canaliculate, spinulose, the 
acanthopores small and usually very numerous ; mesopores small, with sub-cireular 
openings.” 
1 41, p. 154. 
2 31, p. 32. 
