XIV 



LIST OF ILLUSTRATIONS 



PAGE 



Various Forms of Limncea, . . 351 



Ramshorn Snail (Planorbis), . . 352 



Circulation in Pleurobranchv&j . . 353 



Acanihodoris spinosa, . . .354 



Ancula cristata, . . . . 356 

 Tethys leporina, .... 357 



Dendronotus arborescens, . . . 357 



Phyllirhoe bucephala, . . . 358 



SEolidia papillosa, . . 359 



Elysia viridis, . . . . 359 



Limapontia capitata, . .- . 360 

 Synapta digitata with parasitic Entoconcha, 361 



Larva of Entoconcha, . . . 362 



Accra bullata, . . . . 362 



Philine aperta, . . . . 363 



Sea- Hare (Aplysia), . . .363 



Pleurobranchus peroni, , . . 364 



Larva of Pneumoderma, . . . 367 



Clione, . . . . .367 



Cavolinia tridentata, . . . 368 



Larva of Cavolinia, . . . 368 



Gleba cordata, . . . .369 



Animal of Periwinkle, . . .369 



Textile Cone, . . . .371 



Black Olive, . . . .373 

 Teeth of Whelks, .... 376 



Section of Whelk, . . . .377 



Animal of Murex, . . . .379 



Egg- Capsules of Pttrptwo, . . . 380 

 Rhizochilus, .... 380 



Helmet-Shell (Cassis), . . .381 



Tun-Shell (Dolium), . . .382 



Fig- Shell (Pyrula), . . .383 

 Money-Cowries, .... 384 



Wing- Shell (Strombus), . . . 384 



Pelican's Foot (Aporrhais), . . 385 



Worm-Shell (Vermetus), . . .385 



Spawn of Periwinkle, . . . 386 



Horned Winkle (Lacuna), . . 387 



Rissoa, . . . . .387 



Viviparous Pond- Snails, . . . 388 



Teeth of Vivipara, . . . 389 



Star-Fish with Thyca, . . .391 



Violet Sea-Snail, . . . .391 



A Pelagic Heteropod (Pterotrachea), . 393 

 Atlanta peroni, .... 394 



Freshwater Nerite, . . . 395 



Dolphin- Shell (Delphinula), . . 396 



Under Surface of Limpet, . . 397 

 Common Chiton, .... 398 

 Larvae of Chiton, .... 399 



Eyed Chiton, . . . .399 



Common Tooth-Shell, . . . 400 



Section of Animal of Dentalium, . .401 



PACK 



Soft-Parts of River-Mussel, . 401 



Anatomy of River-Mussel, . . 402 



Left Valve of Meretrix, . . .403 



Right Side of Anomia, with Shell Re- 

 moved, .... 404 

 Common Mussel Closed and Attached by 



Byssus, .... 405 



Common Mussel Opened, . . . 406 



Date-Shells in the Rock, . . .406 



Pearl-Oysters, . . . .407 



Valve and pft-Parts of Common Oyster, 408 

 Margin of Mantle of Pecten, . . 409 



File-Shell in its Nest, . . .409 



Large River-Mussel, . . .411 



Pearl-Mussels and Pearls, . . . 412 



A Valve and Soft-Parts of Tridacna, . 414 

 Animal and Case of Rocellaria, . , 416 



Pliolas in its Burrow, . . . 416 



Ship- Worm and its Larva, . . 417 



Brechites vaginiferus, . . . 418 



Section of Paludicella, . . . 420 



Lace Coral (Retepora), . . . .421 



Lepralia, ..... 422 

 Sea Mat (Flustra), . . . .423 



Tubulipora verrucosa, . . . 424 



Cristatella and Young, . . . 425 



A Fixed Moss- Animal, . . . 426 



Back Valve of Terebratulina, . . 428 



Development of Thecidium, . . 429 



Thecidium mediterraneum, . . . 430 



Upper Valve and Animal of Crania, . 431 

 Lingula pyramidata, . . .431 



Group of Bristles of an Annelid, . . 432 



Parapodium and Bristles of Annelid 



(Heteronereis), . . . .433 



Sea-Mouse (Hermione) . . . 434 



Head of Nereis, .... 434 

 Various Annelids, .... 435 

 Arenia fragilis, .... 436 

 Chatopterus, . . . .437 



Tube-Worm (Hermella), . . . 437 



Common Serpula, .... 438 



Sabella, 438 



Common Earth -Worm, . . . 439 



Phreoryctes menkeanus, . . 439 



Beaked Nais, . . . ! 440 



Myzostoma giyas, . . .441 



Common Leech, .... 442 

 Structure of Leech, . . . 442 



Rock- Leech, . . .443 



Gephyrean Worms, . . . 444 



Four-Horned Rotifer, . . .446 



Flower Animalcule, . . . 447 



Spiny-Headed Thread-Worm, . . 448 



