BIOLOGICAL SOCIETY OF WASHINGTON. 



N. 



Narwhal skull, female, with two tusks . xx 



o. 



Officers and Council 

 Officers elected, 1889 . . 

 Officers elected, 1890 . . 

 Olenellus, Hall's genus . 

 Olenoides, the genus, of Meek 



... v 



. . . XV 



. . xxiii 

 . . xvii 



. xvii 



Oranges Navel, notes on pollenation of . . x 

 Organs, reproductive, in certain forms of 



Gasteropoda xvu 'i 



Onychomys, synopsis of species, &c . xx 



P. 



Parasite, sheep, a new, Tsenia fimbriata . . 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 



Psychrolutidae, 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 F.nglish Sparrow vii 



Some notes from Rmiii Pasha's 



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 Umbelliferse xvi 



Rotifera, present knowledge of xviii 



S. 



Salmon, D. K,., general remarks on Texas 



Fever xxii 



Salmonidse, distribution and some charac 

 ters of viii 



San Francisco Mountain region. Biologi 

 cal survey, results of xxiii 



Sarracenia, etc., germination of xix 



Scatophagidse, 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 lyOp-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 . . . . ix 



.Contagion and infection from a 



Biological standpoint xiv 



Parasitic protozoa (Coccidea) in the 



renal Kpithelium 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 mohaveiisis xx 



Spermophile, new from Arizona xxi 



Spider bites, notes on xx 



Spider, new and its influence on classifica 

 tion xxi 



Spiiogale, spotted Skunks, description of 



new species and remarks, etc xxi 



Squirrel, Ground, new California ..... xiii 



