CONTENTS XI 



Chapter — Continued 



IX. Free-living nematodes of tlie Gulf of Mexico — Continued Page 



Geographic distribution 318 



Ecology and life habits 319 



Li terat ure cited 320 



Tardigrades of the Gulf of Mexico. By B. G. Chitwood 325 



Notes on the Chaetognatha of the Gulf of Mexico. By E. Lowe Pierce 327 



Notes on the range of species collected in the Gulf of Mexico 328 



Summary 328 



Literature cited 329 



X. Parasitic worms. 



Parasitic helminths. By Asa C. Chandler and Harold W. Manter 333 



Trematoda of the Gulf of Mexico. By Harold W. Manter 335 



Monogenea 335 



Aspidogastrea 336 



Digenea 336 



Gasterostomata 336 



Prosostomata 336 



Host specificity of trematodes of marine fishes of the Gulf of Mexico. . 342 

 The geographical distribution of trematodes of fishes at Tortugas, 



Florida 343 



Trematodes of turtles 345 



Trematodes of birds 346 



Trematodes of mammals 346 



Studies on larval stages and life cycles of trematodes of the Gulf of 



Mexico 347 



Summary 348 



Literature cited 348 



Cestoda. By Asa C. Chandler 351 



Tetraphyllidea 351 



Trypanorhyncha 352 



Incertae sedis 353 



Pseudophyllidea 353 



Cyclophyllidea 353 



Acanthocephala. By Asa C. Chandler 355 



Eoacanthocephala 355 



Palaeacanthocephala 355 



Nematoda. By Asa C. Chandler 357 



Ascaridata 357 



Incertae sedis 358 



Bibliography (Cestoda, Acanthocephala, Nematoda) 358 



XI. Bryozoa, Brachiopoda, Phoronida, and Enteropneusta. 



The Bryozoa of the Gulf of Mexico. By Raymond C. Osburn 361 



Brachiopoda occurring in the Gulf of Mexico. By G. Arthur Cooper 363 



Phoronida. By Joel W. Hedgpeth 367 



Enteropneusta. By Joel W. Hedgpeth 369 



XII. Echinoderm. 



Echinoderms (other than holothurians) of the Gulf of Mexico. By Austin 



H. Clark 373 



Crinoidea 373 



Echinoidea 374 



Asteroidea 375 



Ophiuroidea 376 



Bibliography 378 



The holothurians of the Gulf of Mexico. By Elisabeth Deichmann 381 



Technique 382 



Key to the orders 383 



Elasipoda 383 



Aspidochirota 384 



