92 



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 striae are 

 exhibited, but specimens exhibiting the interior of 

 the ventral valve with the angular trough between 

 the dental lamellae are not very rare. 



Locality and Formation. Corniferous Limestone 

 of Port Colborne. 



Genus LINGULA (Bruguiere). 

 Fig 29 Shell oblong, compressed, sub-equivalve, at- 



Amphigenia elongata (Billings), a. Exterior of the tached b J a pedicle passing Out between the Valves. 



ventral valve of a small example; 6. Interior of the urn- Shell- Structure minutely tubular, texture homy, 

 bonal region of a broken ventral valve sHbwing the trough QT 11 ,. -i. -1,1 i i A 4- t- A ' 



between the dental lamellae. Both of the natural size, btiell Slightly gaping at eacn enu, truncated in 



Corniferous Limestone. 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. LINGULA SQUAMIFORMIS (Phillips)? 



Lingula squamiformis (Phillips), Geol. of Yorkshire, Vol. II., PI. IX., fig. 14. 

 Lingula squamifoi mis (Davidson), Monograph of British Carboniferous Brachiopoda, p. 

 205, PI. XLIX., figs. 1-10, and Monograph" of British Devonian Brachiopoda, p. 105, PL 

 XX., figs. 11, 12. 



Lingula mola (Salter), Quart. Journ. Geol. Soc., Vol. XIX., 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 either 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 striae, 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 

 other species with which I am acquainted, though I 

 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 



Pig- 3 - place them here provisionally. The chief point in 



our examples differ from L. squamiformis is 



maida (Haii), natural size, from the Corniferous that the beak appears to be more broadly rounded, 



Limestone. aQ( j ^ g-^ are Qot ^fa go s t ra ight. Some of 



