TAW.E OF CONTEXTS. 



CHAPTER VII. 



PAGE 



I'HVT.UM NEMATHELMINTHES 273 

 Class I. NEMATODA . . 274 



Chaetosomatidae and 



Desmoscolecidae 291 



Class II. NEMATOMORPHA . 292 

 ,, III. ACANTHOCEPHALA 293 



CHAPTER VIII. 



PHYUTM KOTIFERA. . . 299 



Order 1. Ehizota . .307 



,, 2. Bdelloida . . 308 



,, 3. Ploima . . 308 



., 4. Scirtopoda . . 310 



,, 5. Seisonacea . . 310 



Gastrotricha . 310 



Echinoderidae . 311 



CHAPTER IX. 

 THE COELOMATA . . . 313 



CHAPTER X. 



PHYLUM MOLLUSCA . . .316 



Class I. LAMELLI- 



BRANCHIATA 324 



Order 1. Protobrancbiata . 345 

 ,, 2. Filibrancbiata . 345 



Sub-order 1. Anomiacea . 345 

 ,, 2. Arcucca . . 345 



,, '>. Mytilacca . 349 



Order 3. Pseudolamelli- 



branchiata 346 



,, 4. Eulamellibranchiata 347 



Sub-order 1. Submytilacca . 347 



,, 2. Tellinacea . 347 



,, 3. Veneracea . 348 



,, 4. Cardiacea . 348 



,, 5. Myacea . 348 



,, 6. Plwladacea . 348 



,, 7. Anatinacea . 349 



Order 5. Septibranchiata . 349 



Class II. SCAPHOPODA . 349 

 III. SOLEXOGASTRES . 352 



PAGE 



356 



387 

 392 



392 



CHAPTER X. MOLLUSCA coittil. 



Class IV. GASTROPODA 

 Sub-class 1. ISOPLEUKA . 



,, 2. ANISOFLETKA 

 Order 1. Streptoneura . 



Sub-order 1. Aspido- 



branchiata 393 



Tribe 1. Docoglossa . 394 



,, 2. Rhipidoglnssa . . 394 



A. Zygobninchiata . 394 



B. Azygobranchiata . 395 



Sub-order 2. Pec/ in i- 



bm iicliiata 395 



Tribe 1. Ptenoglossa . 3!6 



,, 1. Kacliiglossa . . 396 



3. Toxoglos^a . . 397 



,, 4. Taenioglossa . . 397 



A. Platypoda . . 397 



li. Heteropoda . 400 



,, 5. Gyiniiii.nlossa . . 402 



Order 2. Euthyneura . . 402 



Sub-order 1. Opistho- 



branchiata 403 



Tribe 1. Tectibraucliiata 



(includes Pteropoda) 403 



Section 1. Bulloidea . . 405 



,, 2. Aplysinhli ;i . 407 



,, 3. Pleurobranchioidea 408 



'J'ribe 2. Xudibranchiata . 409 



Tribe 1. Tritonioidea . 411 



,, 2. Doridioidea . 41i! 



,, 3. Aeolidioidea . 412 



4. Elysioidea . . 413 



Sub-order 2. Pulmonata . 414 



Tribe 1. Basommatophora . 415 



,, 2. Sty lorn matophora . 416 



Class V. CEPHALOPODA . 417 



Order 1. Tetrabrancbiata . 443 



,, 2. Dibranchiata . . 444 



Sub-order 1. Decapu<l<i . 444 



,, 2. Octopoda . 445 



CHAPTER XI. 



PH\LUM ANNELIDA . . .447 



Class I. ARCHIANNELIDA . 451 



,, II. CHAETOPODA. . 458 



Order 1. Polychaeta . . 458 



Phanerocephala . 475 



Sub-order 1. Nereidiformia. 475 



,, '_'. Spioniformia . 483 



