CONTENTS. V 



PAGE 



ORDER XL SIPHONOSTOMA .... 276 



ORDER XII. LERN^IDA .... 279 



SECTION E. CIRRHOPODA ..... 280 



ORDER XIII. CIRRHOPODA .... ib. 



SECTION F. ARANEIFORMIA ..... 286 



ORDER XIV. ARANEIFORMIA .... ib. 



GEOGRAPHICAL DISTRIBUTION OF CRUSTACEA . . 288 



CHAPTER XIII. 



OF THE VERMIFORM CLASSES 292 



CLASS OF ANNELIDA . . . . . . 29-1 



ORDER I. DORSIBRANCHIATA .... 299 



ORDER II. TUBICOLA .... 301 



ORDER III. TERRICOLA ..... 304 



ORDKR IV. SUCTORIA ..... 307 



CLASS OF ENTOZOA 309 



CLASS OF ROT1FERA 318 



CHAPTER XIV. 



OF THE MOLLUSCA IN GENERAL 326 



CHAPTER XT. 



OF THE CLASS OF CEPHALOPODA .... 338 



ORDER I. DIBRANCHIATA .... 345 



ORDER II. TETRABRANCHIATA . . . 352 



CHAPTER XVI. 



OP THE CLASS OF GASTEROPODA 358 



ORDER I. PULMONIFERA .... 367 



ORDER II. PROSOBRANCHIATA .... 371 



SECTION A. PECTINIBRANCHIATA . . 372 



SECTION B. CYCLOBRANCHIATA . . . 383 



SECTION C. CIRRHOBRANCHIATA 384 



