176 
G. W. Lee — Trepostomata. 
Specimen R. 2749, from near Kirk Beck, Cumberland, is a small solid branch, 
characterised by a short peripheral region and the scarcity of the tabulae. 
From the Upper Calp Shale of Bundoran, Ireland, Mr. W. B. Wright collected a 
Tabulipora remarkable by the extreme minuteness of the zooecia, of which seventy occur 
along a distance of 1 cm. The peripheral region is long. The tabular are more abundant 
in the portion preceding the final bending than in the peripheral region. The walls are 
irregularly moniliform and acanthopores are absent. The ratio of axial region to 
diameter is 05:1. 
G-enus Batostomella Ulrich. 1 
Batostomella bundokensis sp. nov. 
Plate XVI, figs. 16, 17. 
Description. —(a.) External characters. The type consists of a solid, regularly 
cylindical branch 5 mm. thick. The surface appears smooth to the naked eye. By means 
of a strong lens, the zooecial apertures, of which there are some sixty along a distance of 
1 cm., are seen to be surrounded by numerous smaller apertures. Both are sub-circular. 
The acanthopores are not readily seen. Maculae or monticules appear to be absent. 
(b.) Internal structure. Vertical sections show that the axial region is narrow, and 
the bend to the periphery abrupt and at right angles, while the thickening of the walls 
is considerable, assuming sometimes a roughly moniliform structure. Each zooecium is 
accompanied by a variable but considerable number of mesopores. The tabular are very 
thin and are present at irregular intervals, it being quite possible that, owing to their 
thinness, they escape observation when the slide is ground to the usual thickness. In the 
portion of the slide selected for the drawing reproduced in pi. xvi., fig. 17, the tabulae of 
the zooecium appear as centrally perforated, while those of the mesopores are complete 
except for interruptions probably attributable to tearing off during the process of 
grinding the slide. 
In tangential sections the zooecia and the mesopores have a circular outline. The 
acanthopores are much larger than appears at the surface. They occur principally 
at the junction-angles of the mesopores, while smaller ones are occasionally seen round 
the zooecia. 
The ratio of axial region to diameter is 05 : 1. 
A diagnosis of the genus is given on p. 150. 
