182 
G. W. Lee—Trepostomata. 
Observations. —Two of the mesopores shown in the illustration, pi. xvi.,fig. 11, appear 
as if they were closed : this is probably an effect due to the plane of section being not 
quite median. 
Although longitudinal sections bear some resemblance to sections of the preceding 
species, D. ambigua is readily distinguished by its narrower axial region and small 
acanthopores. 
Genus Koninckopora gen. nov . 1 
Koninckopora inflata (de Koninck). 
Plates XI.V, figs. 17, 18 ; XVI, figs. 21-23. 
1842. Calamopora inflata de Koninck. Description des Animaux Fossiles du Terrain 
Carbonifere de la Belgique, p. 10, pi. A, figs. 8a, 8b. 
1855. Stenopora inflata M‘Coy. Systematic description of the British Palaeozoic 
Fossils in the Geological Museumof the University of Cambridge, p. 82. 
1872. Monticuliporaf inflata He Koninck. Nouvelles Recherches sur les Animaux 
Fossiles du Terrain Carbonifere de la Belgique, p. 146, pi. xiv., fig. 4. 
Description. —(a.) External characters. The zoarium appears to be always hollow. 
Most of its bulk consists of a very thick epizoarium, which determines the ultimate shape 
of the colony. The shape varies from that of a more or less flattened hollow cylinder to 
that of thick tabulated masses in which the epizoarium is folded upon itself. 
The surface is uniformly smooth : the partitions of the apertures are not raised, and 
acanthopores appear to be absent. There are neither monticules nor maculae. The 
apertures appear as circular or sub-polygonal, presumably according to the amount of 
weathering or of rubbing undergone by the surface. 
(b.) Internal structure. The epizoarium attains several millimetres in thickness, 
whilst the length of the attached zocecia seldom exceeds 05 mm. A peculiar feature of 
this species is that whatever the direction of the section, the zooecia always appear to 
spring at right angles from the epizoarium without being at first prostrate as is the case 
in the Trepostomata generally. 
The zooecia average seventy along a distance of 1 cm. The walls are thin, but with one 
or two moniliform swellings near the middle of their course, and often expanding at their 
termination. Slides from English and Belgian materials failed to reveal the presence of 
A diagnosis of the genus is given on p. 152. 
