XIV 
LIST OF ILLUSTRATIONS 
PAGE 
PAGE 
Various Forms of Limncea, 
. 351 
Soft-Parts of River-Mussel, 
401 
Ramshorn Snail ( Planorbis), 
. 352 
Anatomy of River-Mussel, 
402 
Circulation in Pleurobranchus, 
. 353 
Left Valve of Meretrix, 
403 
Acanthocloris spinosa, 
. 354 
Right Side of Anomia, with Shell Re¬ 
Ancula cristata, 
. 356 
moved, .... 
404 
Tethys leporina, 
. 357 
Common Mussel Closed and Attached by 
Dendronotus arborescens, 
. 357 
Byssus, .... 
405 
Phyllirhoe bucephala, 
. 358 
Common Mussel Opened, . 
406 
JEolidia papillosa, . 
. 359 
Date-Shells in the Rock, . 
406 
Elysia viridis, 
. 359 
Pearl-Oysters, .... 
407 
Limapontia capitata, 
. 360 
Valve and Soft-Parts of Common Oyster, 
408 
Synapta digitata witli parasitic Entoconcha, 361 
Margin of Mantle of Pecten, 
409 
Larva of Entoconcha, 
. 362 
File-Shell in its Nest, 
409 
Acera bullata, 
. 362 
Large River-Mussel, 
411 
Philine aperta, 
. 363 
Pearl-Mussels and Pearls,. 
412 
Sea-Hare ( Aplysia), 
. 363 
A Valve and Soft-Parts of Tridacna, 
414 
Pleurobranchus peroni, 
. 364 
Animal and Case of Rocellaria, 
416 
Larva of Pneumoderma, 
. 367 
Pholas in its Burrow, 
416 
Glione, 
. 367 
Ship-Worm and its Larva, 
417 
Cavolinia tridentata, 
. 368 
Brechites vaginiferus, 
418 
Larva of Cavolinia, 
. 368 
Section of Paludicella, 
420 
Gleba cordata, 
. 369 
Lace Coral (Retepora), 
421 
Animal of Periwinkle, 
. 369 
Lepralia, ..... 
422 
Textile Cone, 
. 371 
Sea Mat (Flustra), .... 
423 
Black Olive, 
. 373 
Tubulipora verrucosa, 
424 
Teeth of Whelks, . 
. 376 
Cristatella and Young, 
425 
Section of Whelk, . 
. 377 
A Fixed Moss-Animal, 
426 
Animal of Murex, . 
. 379 
Back Valve of Terebratulina, 
428 
Egg-Capsules of Purpura, . 
. 380 
Development of Thecidium, 
429 
Rhizochilus, 
. 380 
Thecidium mediterraneum,. 
430 
Helmet-Shell (Cassis), 
. 381 
Upper Valve and Animal of Crania, 
431 
Tun-Shell (Dolium), 
. 382 
Lingula pyramidata, 
431 
Fig-Shell ( Pyrula ), 
. 383 
Group of Bristles of an Annelid, . 
432 
Money-Cowries, 
. 384 
Parapodium and Bristles of Annelid 
Wing-Shell (Strombus), 
. 384 
(Heteronereis), .... 
433 
Pelican’s Foot (Aporrliais), 
. 385 
Sea-Mouse (Hermione) 
434 
Worm-Shell (Vermetus), . 
. 385 
Head of Nereis , .... 
434 
Spawn of Periwinkle, 
. 386 
Various Annelids, .... 
435 
Homed Winkle (Lacuna), 
. 387 
Arenia fragilis, .... 
436 
Rissoa, 
. 387 
Chcetopterus, .... 
437 
Viviparous Pond-Snails, . 
. 388 
Tube-Worm ( Hermella), 
437 
Teeth of Vivipara, 
. 389 
Common Serpula, .... 
438 
Star-Fish with Thyca, 
. 391 
Sabella, ..... 
438 
Violet Sea-Snail, . 
. 391 
Common Earth-Worm, 
439 
A Pelagic Heteropod (Pterotrachea), 
. 393 
Phreoryctes menkeanus, 
439 
Atlanta peroni, 
. 394 
Beaked Nais, .... 
440 
Freshwater Nerite, 
. 395 
Myzostoma gigas, .... 
441 
Dolphin-Shell (Delpliinula), 
. 396 
Common Leech, .... 
442 
Under Surface of Limpet, 
. 397 
Structure of Leech, . 
442 
Common Chiton, . 
. 398 
Rock-Leech, .... 
443 
Larvae of Chiton, . 
. 399 
Gepliyrean Worms, 
444 
Eyed Chiton, 
. 399 
Four-Horned Rotifer, 
446 
Common Tooth-Shell, • 
. 400 
Flower Animalcule, 
447 
Section of Animal of Dentalium, 
. 401 
Spiny-Headed Thread-Worm, 
448 
