DAVIS : FOSSIL FISH-REMAINS, CULTRA, IRELAND. 333 
Carboniferous series of that country. The latter consists of two 
spines and a number of bony plates of a species of Coelacanthus. 
In 1881, in a paper read at the Geological Society (Quarterly 
Journal, vol. xxxvii., p. 427), I described a number of spines obtained 
from the Cannel Coal at Tingley and the Lower Limestone series 
near Edinburgh. Similar in form to some members of the genus 
Pleuracanthus, they were readily distinguished by the entire absence 
of lateral or posterior rows of denticles. For these spines the generic 
name Anodontacanthus was suggested. They were straight and 
gradually contract in diameter towards the apex, which is more or 
less pointed. An internal cavity, wide at the base, extends nearly 
the whole length of the spine ; from its resemblance to the form of 
the spine of Pleuracanthus, it is probable that the spine of Anodon- 
tacanthus was implanted in the same manner, possibly in a similar 
position behind the occipital region of the head, as in that genus. 
The fish spines from Cultra possess the generic characters of Anodon- 
tacanthus, they are straight and tapering, the internal cavity opens 
terminally, and they are without denticles. They are much more 
slender in proportion to their length, but this feature can only be 
regarded as of specific importance. 
Anodontacanthus attenuatus, Davis, sp. no v. 
Spine: length preserved 1'8 inches; width near the base O'l inch, 
decreasing towards the apex, which is half the diameter of the base. 
The spine is straight, circular near the base, laterally depressed, with 
a slight median groove towards the apex; its surface is divided by a 
series of small ridges which present a slightly imbricated appear- 
ance, between the ridges the surface is smooth. An internal cavity 
extended through the whole length of the spine, so far as these speci- 
mens exhibit it, unfortunately the upper termination is defective. 
This species differs from the species already described in its 
elongated form and attenuated aspect. From A nodontacanthus ohtusus 
and A. fastigiatus it may be distinguished by its round section near 
• the base, those species being oval, and from A. acutus, which is uni- 
formly round, it is readily recognised by the depressed and channelled 
lateral surface towards .the apex. The ridges ornamenting its 
external surface also serve to separate this form from those previously 
