93 
Mr. Davidson’s figures (Loc. cit) would, however, agree well enough in these respects with 
our form, though this does not seem to be the normal condition of the species. The front 
portion of the shell is not exhibited by any of the specimens that I have seen, and it is, 
therefore, impossible to decide as to whether it was truncated or not. The only species of 
Lingula which has been described by Hall from the Devonian strata of New York, and which 
has any affinity with the present form, is L. Manni (Pal. N. Y., Vol. IV., p. 6, Pl. IL, fig. 3). 
If this be specifically distinct from L. squamiformis, it is possible that our specimens may 
belong to it, but I prefer keeping them distinct at present, as they are considerably larger and 
broader. 
Locality and Formation.—Rare in the Corniferous Limestone of Port Colborne. 
112. LincguLa maripA (Hall) ? 
‘« Shell linguiform, elliptical, greatest width alittle more than half the length, narrowing 
gently towards either extremity, obtusely rounded and produced below, and more acutely con- 
verging towards the beaks. Surface very gently convex below, and a little more convex on 
the umbo, marked by fine thread-like striz, which are sometimes crowded in fascicles” (Hall, 
Pals\ ey ol Mp. Oe LL. figs 13). 
I have only a single specimen, but that a remarkably well-preserved one, of this form, 
which I identify with some doubt with LZ. maida (Hall), from the Hamilton group. Our 
specimen is from the Corniferous Limestone, and agrees in all essential characters with the 
above quoted description, though slightly smaller than the specimen figured by Hall. It is 
apparently a ventral valve, its length being eight lines, and its greatest width about four 
lines and a-half. The surface exhibits no radiating strie, but is covered with elevated, 
thread-like, concentric lines of growth, about from twelve to fourteen of which occupy the 
space of one line. 
Locality and Formation.—Corniferous Limestone, Hagersville, Township of Oneida. 
Genus PHoLtrpors (Hall). 
The shells of this genus are small, and very similar in appearance to the dorsal valves of 
small specimens of Discina. The valves are squamiform or discoid, calcareous, and appa- 
rently destitute of a foramen in either valve. They differ from the genus Crania in the fact 
that the shell is apparently free and unattached to other bodies. The interior shows a strong 
muscular callosity. Except in the characters of the interior, Pholidops appears to agree 
altogether with McCoy’s genus Pseudocrania, with which, perhaps, further observation will 
unite it. I have found a single species of the genus in the Corniferous Limestone. 
113. PHoutipops ovatus (Fiall). 
Pholidops ovatus (Hall) Pal. N. Y., Vol. III. p. 490, Pl. CIII. B., Fig. 7. 
Shell minute, ovate, slightly longer than wide, in shape Discinoid, with a minute excen- 
tric apex. Surface marked with fine concentric striae of growth, about twelve of which 
occupy the space of one line. 
I have only a single example of this form, but I have no doubt as to its identity with 
Hall’s species. 
It appears, also, very doubtful if the P. Hamiltoniew of Hall, from 
the Hamilton group can be specifically separated from P. ovatus. Our 
specimen has a length of a line and three quarters by a width of a line 
Fig. 31. and a half. 
Ege Ocs Ota ae Locality and Formation.—Corniferous Limestone, Port Colborne. 
N) 
enlarged. From the 
Corniferous Limestone 
Genus Ca@LosPirA (Hall). 
Shell “ concavo-convex, having the ventral valye convex, or sometimes sub-angularly 
arching over the concave dorsal valve. The surface of the shell is striated or plicated, with 
the plications simple or bifurcating, and of which two or more in the centre of the ventral 
¢ 
