134 PERMIAN FOSSILS. 
Trigonotrela Permiana is of rare occurrence in the shell limestone at Humbleton 
Quarry and Tunstall Hill, the only localities known. 
Genus Martina, M‘Coy, 1844. 
SPIRIFER, Auct. 
RericuLarta (included), M‘Coy. 
Diagnosis —“ Hinge-line shorter than the width of the shell; dorsal edges of the 
cardinal area obtusely rounded ; surface smooth ; spiral appendages small.’ (M‘Coy.?) 
« Type, Spirifer decora, Phillips. 
“The short-hinged Spirifers were distinguished long ago by that excellent artist 
and friend of Mineral Conchology, Mr. W. Martin, and placed by him in a separate 
division from the long-hinged, ribbed species; they were afterwards confounded 
together by the late Mr. Sowerby under the general name of Sporifer, m the ‘ Mineral 
Conchology ;’ they were then separated again by Professor Phillips, in his admirable 
‘Geology of Yorkshire,’ and form the fourth division of his genus Spirifer; and more 
recently Von Buch, in his Memoir on the genus De/thyris, forms of them his second 
division of the Spiriferide, but hitherto no author has named, or fully characterised, 
this most natural genus.”° 
This genus seems to unite Zzgonotreta with Atrypa or Athyris. It has the area and 
fissure of the former, combined with the outline of the latter; but Atrypa and Athyris 
also differ from JJartimia in being foraminated. 
The histology of the present genus is somewhat variable. In the typical forms the 
shell is fibrous and finely punctated; in certain of those forming M‘Coy’s genus 
Reticularia the punctures are large, and the fibres appear to be coarse ; and in one of 
the species hereafter noticed, but in which punctures have not yet been discovered, the 
fibres appear to have a very coarse character. 
MARTINIA CLANNYANA, King. Plate X, figs. 11, 12, 13. 
Martinia CLannyana, King. Catalogue, p. 8, 1848. 
Diagnosis.—* \ minute species; as wide as long; nearly smooth: /ront slightly 
emarginate: deltidial valve very convex, with a slight mesial furrow: ventral valve 
nearly flat: area equilateral : deltidiwm a little narrower than the area.” (King.)’ 
Through an oversight, the locality ““ Tynemouth” was given in my ‘ Catalogue’ instead of Tunstall Hill. 
2 Synopsis of the Characters of the Carboniferous Fossils of Ireland, p. 139. 
eh loc.) cit. 
+ Named after the late Dr. William Reid Clanny, who published in the ‘ Annals of Philosophy,’ vol. vi, 
a paper entitled ‘An Account of the Sunderland Limestone Formation,’ and containing the earliest notice 
of a fish found in the English Permian ro cks. 
> Catalogue, p. 5. 
