96 CARBONIFEEOUS COEALS AND BEACHIOPODS 
arranged lineally), their irregular thickness and the short 
transverse partitions, the specimen bears a strong resem- 
blance to a section of a very fine Reticulate Syringopora. 
In parts of the same section, however, the shape of the 
spaces is more obviously that of a large Alveolites. 
No projections from the walls into the spaces are clearly 
shown, and, in the specimen we are describing, tabulae cannot 
be definitely made out, but in a precisely similar specimen 
in the British Museum, the tabulae are very clearly exhibited 
in one part of the section. 
The spaces maintain an average width of ’7 mm., whilst 
their length may reach 4 mm. 
2. A small, knob-shaped, solid specimen shows the same 
lineally elongated openings on its surface, but, since the 
natural tendency of destruction by rain is to dissolve away 
the cross partitions along a continuous rut, the superficial 
aspect may not represent the internal structure. I have, 
consequently, only tentatively referred this specimen to the 
above species. 
3. A horizontal section which shows large spaces (about 
*8 mm. diameter) of normal development, thick but 
distinct walls and no clearly defined projections from the 
walls is, very probably, the normal form from which the 
specimen described above (1) is an abnormal mutation. 
The removal of several adjacent walls and the deposit of 
carbonate of lime on those that remain would easily account 
for the very peculiar character exhibited by the first 
specimen. 
None of the specimens are located. 
Choetetes. 
(? Choetetes) hristoliensis, n. sp. PI. I, fig. 2. 
Corallum broad, flattened, tall and cylindrical ; the 
corallites of large size (‘95 mm. diameter) radiating and 
diverging upwards and outwards and exhibiting a strong 
