154 LIST OF CONTRIBUTORS. 



Rand, Theodore D. Continued. 



A new locality for gypsum. P '80, 253 



On a belt of steatite and serpentine in Radnor Township, 



Delaware Co., Pa. P '80, 273 



Chromite near Radnor, Pa. P '80, 273 



On randite. P '80, 274 



Some microscopic enclosures in mica. P '80, 276 



Potsdam sandstone near King of Prussia. P '80, 279 



On a peculiar stratification in gneiss. P '80, 280 



The northern belt of serpentine in Radnor Township. P 



'80, 295 



Notes on the geology of Radnor and vicinity. P '82, 42 



Crystalline cavities in agate. P '82, 49 



Discs of quartz between laminae of mica. P '82, 50 



New locality for mountain cork. P '82, 56 



Notes on the geology of Lower Merion and vicinity. P '82, 61 



Notes on the geology of Chester Valley and vicinity. P '83, 241 



Notes on the Lafayette serpentine belt. P '85, 407 



Notes on the drift in Block Island. P '89, 408 



Notes on the genesis and horizons of the serpentines of south- 

 eastern Pennsylvania. P '90, 76 



Geology of the South (Chester) Valley Hill. P '90, 435 



The sandstones of Chester Valley, Pennsylvania. P '91, 119 



Geology of the Isles of Shoals. P '92, 324 



The supposed South Chester Valley Hill fault. P '92, 445 



The Sadsbury steatite. P '94, 455 



Trap dykes in Chester County, Pennsylvania. P '95, 540 



The serpentines of eastern Pennsylvania. P '96, 219 



Mica schists of the Schuylkill River. P '96 484 



The Birdsboro trap quarries. P '98, 10 



Notes on the geology of southeastern Pennsylvania. P 



1900, 160 



Rand, Theodore D., William W. Jefferis and J. T. M. Cardeza. 

 Mineral localities of Philadelphia and vicinity. P '92, 174 



Rafinesque, C. S. Description of three new genera of fluviatile 

 fish, Pomoxis, Sarchirus and Exoglossum. J i, 417 



Randall, J. W. Catalogue of the Crustacea, brought by Thomas 

 Nuttall and J. K. Townsend, from the west coast of North 

 America and the Sandwich Islands, with descriptions of such 

 species as are apparently new, aimong which are included several 

 species of different localities, previously existing in the collection 

 of the Academy, j viii, 106 



