272 Cincinnati Society of Natural History. 



in Nebraska, in the vicinity of Peno creek, a small tributarj^ of Teton, 

 or Little Missouri river, in a thin bedded, light gra}^, siliceous lime- 

 stone, near the summit of the elevated plateaux which border the 

 Mauvaises Terres, Planorhis nehrascensis, Limncea diaphana, L. ne- 

 hrascensis^ Physa secalina, and Cypris leidyi. 



T. A. Conrad* described, from the (Jackson Group) Greensand 

 Marl-bed of Jackson, Mississippi, Astarte parilis, Umbrella planulata, 

 Corhula hicarinata, C. densata, Leda multilineata, now JS/icculana 

 mtiUilineata, Naviciila aspera, Crassatella Jlexura, Glossiis flosus, 

 now Axinosa Jllosa, Ostrea trigonalis, Pecten nuperits, Capulus ameri- 

 canus, Clavelithes humerosus, C. varicosus, C. mississippiensis, now 

 PapiUinamississippiensis, Trochita alta, Mitra dumosa, ^o^ Lapp aria 

 dumosa. Comes tortilis, Volutilithes symmetricus, V. dumosus, Rostella- 

 ria velata, now Calyptrophorus velatus^ B. Staminea, now C. stamin- 

 eus, Caricella subangulata, C. polita^ Natica permunda^ Bostellaria 

 extenta, now Platyoptera extenta, Mitra milling toni, now Fusimitra 

 millingtoni, Teredo mississijypiensis^ Architectonica acuta^ A. hellistri- 

 ata^ Cyprcea pinguis, C. fenestralis^ Gastridium vetustum, Phorus 

 reclusus, Turritella alveata^ Galeodia peter soni, and Strepsidura du- 

 mosa. 



Dr. J. W. Dawson, f describing the drift of Nova Scotia, in 1855, 

 said, that in the low country of Cumberland there are few bowlders, but 

 of the few that appear, some belong to the hard, rocks of the Cobequid 

 hills to the southward; others ma^- have been derived from the some- 

 what similar hills of New Brunswick. On the summits of the Cobe- 

 quid hills, and their northern slopes, we find angular fragments 

 of the sandstones of the plain below, not only drifted from their orig- 

 inal sites, but elevated several hundreds of feet above them. To the 

 southward and eastward of the Cobequids, throughout Colchester, 

 Northern Hants, and Pictou, fragments from these hills, usually much 

 rounded, are the most abundant traveled bowlders, showing that there 

 has been great driftage from this elevated tract. In like manner, the 

 long ridge of trap rocks, extending from Cape Blomidon to Briar Island, 

 has sent off great quantities of bowlders across the sandstone valley 

 which bounds it on the south, and up the slopes of the slate and granite 

 hills to the southward of this valley. Well characterized fragments of 

 trap from Blomidon may be seen near the town of Windsor, and un- 

 mistakable fragments of similar rock from Digb}^ neck, on the Tusket 

 river, ma}^ be seen, thirty miles from their original position. On the 



'•' Wailes' Geo. of Miss, 

 t Acadian Greology. 



