CONTRIBUTIONS TO A SCIENCE OF NEMATOLOGY 



Contents 



Page 



I. Antarctic Marine Free-Living Nematodes of the 



Shackleton Expedition 1 



II. North American Free-Living Fresh-Water Nema- 

 todes Z5 



III. The Asymmetry of the Nematode Bunonema in- 



equale, n. sp 101 



IV. Selachinema, a New Nematode Genus with Remark- 

 able Mandibles 113 



V. Notes on Nemas 117 



VI. The Mononchs, a Genus of Free-Living Predatory 



Nematodes 129 



VII. Filter-Bed Nemas: Nematodes of the Slow Sand 



Filter-Beds of American Cities 189 



VIII. The Orders and Classes of Nemas 213 



IX. One Hundred New Nemas 



(Type Species of 100 New Genera) 217 



X. Howardula benigna, a Nemic Parasite of the 



Cucumber -Bee tie 345 



XI. Marionella ' 353 



XII. Greeffiella 359 



XIII. An Amendation of Hoplolaimus Daday 1905 nee 



auctores 363 



XIV. Notes on Paratylenchus, a Genus of Nemas . . . 367 

 XV. Biological Relationships of the Mathematical 



Series 1, 2, 4, etc 371 



XVI. Nemic Spermatogenesis 375 



XVII. The Screw Nemas, Parasites of Codfish, Haddock 



and Other Fishes 388 



XVIII. Ungella secta n. gen. n. sp., a Nemic Parasite 



of the Burmese Oligochaete (Earthworm) .... 394 



XIX. A New Species of the Nemic Genus Syringolaimus. 398 



XX. The Chromatropism of Mermis subnigrescens . . . 403 



XXI. Survey of Nemas in Marine Beach Sand 411 



XXII. The Ambulatory Tubes and Other Features of the 



Nema Draconema cephalatum 413 



XXIII. Observations on the Morphology and Physiology 



of Nemas 419 



XXIV. The Demanian Vessels in Nemas of the Genus 



Oncholaimus 423 



XXV. Metoncholaimus pristiurus (Zur Strassen). . . . 439 

 XXVI. A Key to the Genera of Free-Living Nemas . . . 451 



87184 



