All the examples that I have seen of this species 
from the Corniferous Limestone are smaller than 
the average, and appear to be immature, the largest 
not exceeding an inch and a-half in length. I 
have seen no example in which radiating striz are 
exhibited, but specimens exhibiting the interior of 
the ventral valve with the angular trough between 
the dental lamellze are not very rare. 
Localiiy and Formation.—Corniferous Limestone 
of Port Colborne. 
Genus LineuLA (Bruguiére). 
Fig. 29. Shell oblong, compressed, sub-equivalve, at- 
Amphigenia elongata (Billings). a. Exterior of the tached by a pedicle passing out between the valves, 
ventral valve of a small example ; b. Interior of the nm- Shell_structure minutely tubular, texture horny. 
bonal region of a broken ventral valve showing the trough eeuane 3 . : 
between the dental lamellw. Both of the natural size. Shell slightly gaping at each end, truncated in 
Romain us. Cinnessoue: front, rather pointed at the umbones ; dorsal valve 
rather shorter, with a thickened hinge-margin, and a raised central ridge inside” (Woodward). 
Only two species of this genus have come under my notice as occurring in the Devonian 
Rocks of Western Ontario, and in neither case, though in one instance the specimens are well 
preserved, have I been able to determine the species with certainty. Sooner, however, than 
add any fresh species to this already over-crowded genus, I have referred our forms provision- 
ally to the following previously recorded species, 
111. LinauLa squamrrormis (Phillips) ? 
Lingula squamiformis (Phillips), Geol. of Yorkshire, Vol. II., Pl. IX., fig. 14. 
Lingula squamiformis (Davidson), Monograph of British Carboniferous Brachiopoda, p. 
205, Pl. XLIX., figs. 1-10, and Monograph of British Devonian Brachiopoda, p. 105, PI. 
XX., figs. 11, 12. 
Lingula mola (Salter), Quart, Journ. Geol. Soc., Vol. XTX., p. 480. 
“Shell longitudinally oblong, one-third or less longer than wide, with sub-parallel sides, 
the broadest towards the anterior extremity, the frontal margin assuming cither a very slight 
inward or outward curve. The anterior portion is gradually curved on either side, the beak 
being rounded or but slightly angular at its extremity in the dorsal valve, with a thickened 
margin, tapering, pointed retrally at its termination in the ventral one, which is consequently 
so much longer than the opposite valve. The valves are slightly convex, but somewhat 
depressed along their middle.” In the dorsal one there exists a small apex close to the 
rounded margin of the beak, and from which usually radiate three small rounded ridges, 
separated by shallow sulci. The external surface in both valves is covered with numerous 
fine concentric striz, or lines of growth, giving to the shell a beautifully and delicately sculp- 
tured appearance, for the minute plications of growth succeed each other with much regu- 
larity, while some stronger lines or interruptions of growth are produced at variable distances” 
(Davidson). 
Large individuals have a length of nineteen lines and a width of thirteen lines ; smaller 
have a length of nine lines and a width of six and a half lines. 
I have several fragments of a large, oblong, flat- 
tened Lingula which appears to be more closely 
allied to L. squamiformis, (Phill.) from the Carbo- 
niferous and Devonian Rocks of Britain, than to any 
yj other species with which I am acquainted, though I 
7 am not at all certain that it can be regarded as specifi- 
cally identical with this species. In the imperfect 
condition of our specimens, however, it is best to 
_ Fig. 30, place them here provisionally. The chief point in 
naka rnement of inguta, equamifornis (Phitpetiwhich our examples differ from L. squamiformis is 
gula maida (Hall), natural size, from the Corniferous that the beak appears to be more broadly rounded, 
salt and the sides are not quite so straight. Some of 
