LIST OF CONTRIBUTORS. 



With referenrv tn tin sfrci'id iirticlen n>ntrll»{fi(l hi/ enrli. 

 For Verhiil Cuininuniciitiuns sue (Jfucnil Imlex. 



AUeu, Harrisou. Desci iption of a foetal walrus 38 



On the Temporal and Masseter Muscles of Mammals 385 



Barbeck, Wm. On the Development of Lemna minor. (Plate XVIII.) 230 

 Beriih, R. On the Xudibranchiate Gasteropod ^lollusca of the Xorth 

 Pacific Ocean, with special reference to those of Alaska. Part II. 



(Plates I.-VIII.) 40 



Chapman, H. C. On the Structure of the Orang Outang. (Plates 



XI.-XVII. ) r 160 



Genth, F. A., Jr. The So-called Emery Ore from Chelsea, Bethel 



Township, Delaware County, Pa 311 



Hartman, W. D. Description of a Partula supposed to he new, from 



the Island of Moorea , '.3"3tt 



Heilprin, Angelo. On the Stratigraphical Evidence afforded by the 



Tertiary Fossils of the Peninsula of ]Maryland 20 



On some new Lower Eocene Mollusca from Clarke Co., Alabama, 

 with some points as to the Stratigraphical Position of the Beds 



containing them ( Plate 20 1 364 



Kingsley, J. S. Carcinological Notes, Xo. 1 34 



Carcinological Xotes, X^o. 2.— Revision of the Gelasimi. (Plates 



IX. and X.) 135 



Carcinological Xotes, No. 3. — Revision of the Genus Ocypoda 179 



Carcinological Notes, Xo. 4. — Synopsis of the Grapsidse IST 



Leidy, Jos. Rhizopods in the Mosses of the Summit of Roan Moun- 

 tain, Xorth Carolina , 333 



Lewis, Henry Carvill. The Optical Characters of some Micas 244 



On Siderophyllite, a new 3Iineral 254 



The Surface Geology of Philadelphia and Vicinity 258 



The Iron Ores and Lignite of the Montgomery Co. Valley 282 



On a new Fucoidal Plant from the Trias 293 



The Trenton Gravel and its relation to the Antiquity of Man 296 



On Philadelphite ( Sp. Nov. i 313 



Lockington, W. N. On a Pacific Species of Caulolatilus 13 



Description of a new species of Hemitripterus from Alaska 233 



Description of a new species of Catostomus (Catostomiis Cyplio) 



from the Colorado River 237 



]McCook, Rev. H. C. The Shining Slavemaker. — Notes on the Archi- 

 tecture and Habits of the American Slave-making Ant, Polyergus 



lucidus (Plate 19) , 376 



Rand, Theo. D. On Randite 274 



Report on Plants introduced by means of the International Exhibition, 



1876 '. 132 



Vodges, Anth. W. Description of a new Crustacean from flic Upper 



Silurian of Georgia, with remarks upon Calymene Clintoni. ... 176 



