Vll. 



Pagk. 



MoDioLOPSis. — A genus of fossil bivalves, so called on account of their 



resemblance to species of modiola 4,4, 



MODIOLOPSIS MODIOLAUIS 44 



Mule Deer. — Cervus Macrotis 92 



Mica 19'7 



MoArthur, p. a., of Ottawa, his discovery of a fossil seal 238 



Metamorphoses of Insects 261 



Mya truncata 339 



Mttilus eddlis 343 



Mallotds villosus. — The Capelan 345 



Musk Ox 353 



Mephitis chinga. — The Skunk 360 



Mammoth 379 



Mastodon , 379 



Murray, Alexander Esq. His remarks on Drift of Northern Canada, 



quoted 328 



Niagara Group. — A division of the upper Silurian rocks 22 



TsTomenclature 20 



Natica olausa 342 



Onondaga Salt Group. — The formation containing gypsum, called 



after a locality in the States 22 



Ortbis. — A genus of Brachiopods ; from the Greek, Orthos, straight.. 40 



Orthis Testiidinaria 40 



OssicuLA. — Small bones * 55 



Orthis tricenaria , 129 



Orthis elegantula 136 



Orthis flabellullum 136 



Ornithology. — Technical terms explained 139-140-141-142 



Orthis Lynx 206 



Orthis Pectinella 206 



Ortyx. — Greek, a Quail 284 



Orthooeras 315 



Orthoceras Bilineatum 316 



OviBos Moschatus. — The Musk Ox 353 



Ovis Montana. — Rocky Mountain Sheep 357 



Owl, Great horned 443 



Owl, Snowy 447 



Pliocene. — A division of the Tertiary formation ; Greek, plcion, more, 



and kainos, recent 12-13 



Potsdam Sandstone. — So called from the town of Potsdam, in the 



State of New York— Fossils 18-32 



Protiohnites. — The fossil, foot prints in the Potsdam sandstone ; Greek, 



protos, first, ichnos, foot-print or track, lithos, stone. .35-37 

 Pleurotomaria. — A genus of gasteropods, so called from a notch in one 



side of the aperture ; jo^ewron, a side, toma, a notch. 42 



Pleurotomaria umbilicata 42-48 



Pal^zoio. — From the Greek, palaios, ancient, and onta, beings, per- 

 taining to ancient fossil animals . 



