no 



molJXilCAl, SOCIETY ()F WASHINGTON. 



N. 



PAG) 



Narwhal skull, female, with two tusks . . xx 



o. 



Officers and Council v 



Officers elected, 1889 xv 



( ifficers elected, 1890 xxiii 



Olenellus, Hall's genus xvii 



Oleuoides, the genus, of Meek xvii 



Oranges Navel, notes on pollenation of . . x 

 < >rgans, reproductive, in certain forms of 



Gasteropoda xviii 



Onvchomys, synopsis of species, &c . . . xx 



P. 



Parasite, sheep, a new, Taenia finibriata . . ix 



Parasite, human, note on xiv 



Parasitic protozoa in the renal epithelium 



of the Mouse xix 



Pedomys, sub-genus x 



Peltandra, etc., germination of xix 



Perognathus and Cricetodipus, revison of . xx 



Phenacomys xvi 



Phenacomys celatus xix 



Phenacomys latimanus xix 



Phryne leptostachea, seed vessels of . . . xvii 



Pika (Lagomys.) a new species xv 



Pilea pumila seeds, how ejected .... xxiii 



Plant roots, apparatus for study of xi 



Platypsyllus. notes on x 



Podophyllum peltatum, notes on morphol- 

 ogy of xxi 



Pollen, foreign, influence of on fruit . . . xvi 



Pollenation of wheat, artificial xi 



Potomac formation, fossil woods and lig- 

 nites in xii 



Protozoa parasitic in the renal epithe- 

 lium of the Mouse xix 



Psychrolutidse, on the relations of the . . . xiii 

 Putorius nigripes, black-footed Ferret . xix 



R. 



Rats, Kangaroo, the N. A. belonging to 



the genus Dipodomys xi 



Red-backed Mouse, new, from Colorado . xxiii 

 Reproductive organs in certain forms of 



Gasteropoda xviii 



Reversion of Domesticated animals to a 



wild state ix 



Revision of pocket and grasshopper Mice 



and descriptions of new species . . xx 



Rheum, etc., germination of xix 



Ribs of Birds, abnormalities in '. xi 



Riley, C. V., on the Insectivorous habits 



of the English Sparrow vii 



PAGE 



travels in Central Africa ix 



Notes on Platypsyllus x 



Notes on the economy of Thalessa 



and Tremex xiii 



Note on a human Parasite xiv 



The remarkable Increase of Vedalia 



cardinalis in California xxi 



Ring growth, annual, in trees xix 



Roots of plants. Apparatus for study of, 



underground xi 



Rose, J. N., the geographical distribution 



of the Umbelliferae xvi 



Rotifera, present knowledge of xviii 



s. 



Salmon, D. p;., general remarks on Texas 



Fever xxii 



Salmouidse, distribution and some charac- 

 ters of viii 



San Francisco Mountain region, Biologi- 

 cal survey, results of xxiii 



Sarracenia, etc., germination of xix 



Scatophagidoe, family characteristics of . . xii 

 Seaman, W. H., our present Knowledge 



of the Rotifera xviii 



Seed-planting, dangerous, by the Crow . xvii 

 Seed vessels of the Lop-seed, Phryne 



leptostachya xvii 



Seeds, of Pilea pumila, how ejected . . xxiii 

 Sexual characters in L,achnosterna .... xii 

 Shells, mutations in distribution of species . x 

 Skunk. American, description of a new 



species viii 



Skunks, Spotted, genus Spilogale, re- 

 marks and descriptions of new species . xxi 

 Smith, J. B., Remarks on sexual char- 

 acters in Lachnosterna xii 



Smith. Theobald, the destruction of 

 pathogenic Bacteria in the animal 



organism i x 



Contagion and infection from a 



Biological standpoint xiv 



Parasitic protozoa (Coccidea) in the 

 renal Epithelium of the Mouse . . xix 

 Sparrow, English, insectivorous habits of vii 



Spermophilus Beldingi., xiii 



Spermophile. new species of, in the Col- 

 orado desert region xix 



Spermophilus neglectus xx 



Spermophilus mohavensis xx 



Spermophile, new from Arizona ... xxi 



Spider bites, notes on xx 



Spider, new and its influence on classifica- 

 tion xxi 



Spilogale, spotted Skunks, description of 

 new species and remarks, etc . xxi 



