Retepora cellularis, 318 Salpa, 326 Scyllæa, 283 Sea-Hare, compound stomach of, 295 Sepia, 104, 275 Solen, or Razor-Shell, 304 Strombus pes pelicani, 290 Syllæa, gizzard of, 294 Tiara, 283 Tridacna gigas, 314 Whelk, 413 Worm-shell, 291 Muscles and Electric Batteries of the Torpedo, 202 Nervous Axis of an Annelidan, 262 Noctiluca miliaris, 419 Ova of the Cuttle-Fish, 278 Protozoa:-- Amœba, 379 Foraminifera, 381 Halina papillaris, 386 Infusoria, marine, 384 Nummulina discoidalis, 378 Polycistina, 383 Sponges, 385 Tethea, 385, 386 Reptiles:-- Alligator Lucius, 173 Tortoise, 174 Turtle, Green, 170 Hawk's Bill, 180 Loggerhead, 176 Water-Snake, 183 Rocky Mountains at the bend of the Bear Lake River, 79 Rotifera:-- Conochilus volvox, 268 Philodina roseola, 269 Ptygura melicerta, 267 Saw of the Saw-Fish, 100 Sea-Fowl Shooting, 168 Skeleton of the Dugong, 118 of the Perch, 188 of the Seal, 119 of the Tortoise, 174 Skerryvore Lighthouse, 89 Skull and Head of Walrus, 129