16 



minima, lunata, superne emarginata, incrassata ; tuberculis car- 

 dinalibus magnis, uncinatis ; apophysi subumbonali compresso, 

 geniculate ; ossicula siphonalia pulpito mediano instructa, altero 

 latere subulate, altero ligulato. 



Length and height, ^ inch ; breadth f inch. Tavoy, British 

 Burmah ; Rev. F. Mason and Rev. J. Benjamin. 



In size and solidity this exceeds any species yet described. It 

 is chiefly characterized by the great size of the anterior area 

 when compared with the posterior ; the stilt-like form and great 

 length of the pallets is also quite peculiar. 



Dr. C. T. Jackson gave a brief description of the bituminous 

 coal formation of Elk County, Pennsylvania, which he had been 

 engaged in exploring during the month of June last. He ob- 

 served that the great bituminous coal basin or trough extends 

 from the Northwestern border of Pennsylvania to Tuscaloosa, 

 Alabama, as indicated on Mr. Jules Marcou's Geological Map of 

 the United States. 



The northern portion of this basin is of great economical value, 

 on account of its being the nearest to Lake Erie, one of the 

 greatest markets for coals, which are required for steam navi- 

 gation on all the great lakes, and for the furnaces and gas works, 

 as well as for domestic use for fuel, on both the United States 

 and Canada sides of these lakes. He remarked that statistics 

 showed a larger amount of tonnage on the lakes than exists on 

 the Atlantic coast of this country, and that steam rw^^ation 

 would certainly greatly increase upon the lakes when coals coth^ 

 be obtained at a reasonable cost, as will soon be the case, when 

 the western portion of the Sunbury and Erie Railroad, now 

 under contract, is completed, which would be done in the course 

 of two years. 



Since the recent explorations were made into the extensive 

 coal formation of Elk County, Pa., the Directors of this im- 

 portant railroad have ordered the road to be laid amid those coal 

 fields, and the consequences of this movement will soon be felt 

 in the augmented value of the coal lands. 



The particular region explored by Dr. Jackson, is known as 

 the Ridgeway Land and Coal Company's property, some 27,000 

 acres of land, all situated in the coal region. Five or six beds of 



