CONTENTS 



Chapter — Continued 



VII. Protozoa. Page 



Gulf of Me.xico Foraminifera. By Fred B. Phleger and Frances L. Parker. 235 



Benthonic Foraminifera 235 



Planktonic Foraminifera 241 



Literature cited 241 



Protozoa. By Victor Sprague 243 



Survey of the literature 243 



Distribution of Protozoa 244 



Mastigophora 245 



Sarcodina 246 



Sporozoa 247 



Unidentified species of Nematopsis 249 



Ciliata 251 



Suctoria 255 



Literature cited 255 



VIII. Sponges, coelenterates, and ctenophores. 



The Porifera of the Gulf of Mexico. By J. Q. Tierney 259 



Biology of commercial sponges. By F. G. Walton Smith 263 



Hydroids of the Gulf of Mexico. By Edward S. Deevey, Jr 267 



Collecting 267 



Zoogeography 268 



Check list of Gulf of Mexico hydroids 269 



Summary 27 1 



Literature cited 27 1 



Hydromedusae of the Gulf of Mexico. By Mary Sears 273 



Siphonophores in the Gulf of Mexico. By Mary Sears 275 



Scyphozoa. By Joel W. Hedgpeth 277 



Anthozoa: Alcyonaria. By Frederick M. Bayer 279 



Anthozoa: The anemones. By Joel W. Hedgpeth 285 



Notes on common species 287 



Bibliography 290 



Gulf of Mexico Madreporaria. By F. G. Walton Smith 291 



Ctenophores in the Gulf of Mexico. By Mary Sears 297 



IX. Free-living flatworms, nemerteans, nematodes, tardigrades, and chae- 

 tognaths. 

 Free-living flatworms [Turbellaria] of the Gulf of Mexico. By L. H. 



Hy man 30 1 



The nemertean fauna of the Gulf of Mexico. By Wesley R. Coe 303 



Geographical distribution 303 



Reproduction and regeneration 304 



Ecology 304 



Food 304 



Key for identification 305 



Systematic description of species 305 



Paleonemertea 305 



Heteronemertea 306 



Hoplonemertea 307 



Bdellonemertea 309 



Bibliography 309 



Eehnioderida of the Gulf of Mexico. By B. G. Chitwood 311 



Free-living nematodes of the Gulf of Mexico. By B. G. Chitwood and 



R. W. Timm 313 



Nematode anatomy 313 



Historical r&um6 314 



Classified list of species 314 



Phasmidea 314 



Aphasmidea 314 



