Neæra = Cuspidaria, 204 Neomenia, 3 Nerita, 18, 19 Neritina, 19–20 Nucleobranchiata = Heteropoda, 84 Nucula, 137 Nuculana, 137 Nudibranchiata, 97 Octopus, 205 Oleacina, 102 Olividæ, 81–83 Ostrea, 152–154 Ovulum = Amphiperas, 35 Paludina = Vivipara, 22 Paludomus, 41 Pandora, 202 Panopea, 201 Partula, 126, 127 Patella, 4–7 Pectinidæ, 156–160 Pectunculus = Glycymeris, 141 Pedum, 156 Periploma, 203 Petricola, 192 Philine, 96 Pholadidæ, 201, 202 Pholadomya, 204 Pholas, 201, 202 Phorus (= Xenophora), 49 Physa, 101 Pinna, 148–152 Pirula, 57 Placuna, 138 Planaxis, 44 Planorbis, 100 Pleurotomaria, 9 Pleurotomidæ, 85–87 Plicatula, 154 Pomatiidæ, 28, 29 Proserpina = Despoena, 22 Psammobia, 197 Pteria, 145 Pterocera, 51, 52 Pteropoda, 96 Puncturella, 7 Pupa, 128 Purpura, 74, 75 Pyramidellidæ, 45 Ranella, 54 Ricinula = Sistrum, 76 Ringicula, 95 Rissoiidæ, 30 Rocellaria, 201 Rostellaria, 52 Rotella, 15, 16 Saxicava, 201 Scala, 44, 45 Scalaria = Scala, 44, 45 Scaphander, 95 Scaphopoda, 136 Scintilla, 163 Scutum, 7 Semele, 181 Sepia, 206, 207 Septaria, 20, 21 Septifer, 143 Siliquaria, 47 Siphonaria, 98, 99 Sistrum, 76 Solarium, 45 Solenidæ, 199–201 Solenomya, 137 Sphærium, 165 Spirula, 207 Spondylus, 154–156 Stenogyra, 133 Stilifer, 46 Stomatella, 11 Streptaxis, 102 Strombus, 49–51 Strophia = Cerion, 129 Strophocheilus, 120 Struthiolaria, 49 Succinea, 135 Sunetta, 187 Sycotypus, 61 Tapes, 190,191 Tellinidæ, 179–181 Terebellum, 52 Terebridæ, 87–89 Teredo, 202 Testacella, 102 Tethys, 96 Thracia, 203 Trichotropis, 37 Tridacna, 195 Trigonia, 141 Triton = Lotorium, 53, 54 Trochidæ, 12–15 Trophon, 70 Truncatella, 30 Tugonia, 198 Turbinellidæ, 60,61 Turbinidæ, 16–18 Turritella, 48 Typhis, 70 Umbraculum, 97 Umbrella = Umbraculum, 97 Ungulina, 163 Unionidæ, 166–178 Valvata, 30 Vanicoro, 49 Velutina, 37 Veneridæ, 185–191 Venerupis, 192 Venus, 188 Vermetidæ, 46, 47 Vitrina, 106 Vivipara, 22 Volutidæ, 78–81 Vulsella, 147 Xenophora, 49 Yoldia, 137 POLYZOA. (*) An asterisk against names of species denotes that specimens of these species are in the upright part of Case A and preserved in spirit. [Sidenote: Upright Table-Cases A and B, at south end of Shell Gallery.] From a casual glance at the contents of these cases, it might be supposed that many of the specimens exhibited therein were seaweeds; but a closer inspection, especially with a lens, will reveal structure of a kind not to be found in any plant. Let us select for examination _Flustra foliacea_, the Broad-leaved Hornwrack or Sea-Mat (Fig. 1), (Case A 1), commonly to be found among heaps of seaweed cast up on sandy shores round our coasts. [Illustration: Fig. 1.