176 



Proceed 1 1) (j'i <>J the lioijal Socldij of Victoria. 



Mustard, 143 



Mictis prof an a, 31 



Myliobatis, 134 



Myliobatis moorabbinensis, 139, 



140, 141, PI. IX., fig. 8 

 Myocliera, 14 

 Myochera acuminata, 15 

 Mytilarca acutirostris, 125 

 Natal Grass, 149 

 Neolepton novacambrica, 112 

 Notiosaurus dentatiis, 127, 128, 130 

 Nucleospira australis, 124 

 Niiculitcs maccoyianus, 125 

 Odontaspis, 134 

 Oioutaspis elegans, 137, 141, and 



PI. IX., fig. 4 

 Odontopleura, 125 

 Odostomia occultidens, 109 

 Oechalia consocinJis, 19 

 Omphalotrochus globosum, 76, 92, 



101, PI. IV. 

 Oncocephiilus cmifusus, 38 

 Oncocepbalus quolidiauus, 17 

 Oncocoris desertus, 19 

 Oncoo^raptus biaiigiilatns, 7i, i'-. 1 



Oncograptus upsilon, 55 seq. 



Opalised reptilian dentary, 132 



Ordovician rocks, 

 area of, 51 



Palaeontological sequence of, 50 

 characters of, 52 



Ordovician rocks, 



revised classification of, 54 

 stratigraphical relations of, 58 

 summary of, 71 



Oreomyrrhis pulvinifica, 144 



Orthoceras, 124 



Orthoceras lineare, 125 



Ortliocarpus purpurascens, 147 



Orthi's actoinae, 124 



Orthonychia brevis, 76, 96, 102, PI. 

 V. 



Osborne, W. A., 115, 119 



Oscillatory adjustments in the ani- 

 mal body, 115 



Palaeoneilo raricostae, 125 



Palaeozoic environment, 123 



Paradrymus, 11 



Paradrymus exilirostris, 12 



Paranienestheus abdittus, 7 



Pea, 146 



Pepper cress, 146 



Petalaspis, 29 



Petalaspis tescorum, 30 



Petrology of the silurian sedi- 

 ments, 40 



Piezodorus rubro-fasciatus, 29 



Pinus Pinaster, 147 



Phacops sweeti, 125 



Phanerotrema australis, 76, 83, 

 101, PI. III. 



Plantago Bellardi, 147 



Plantago Pysllium, 148 



Plantain, 147, 148 



Platyceras minutum, 76, 97, 102, 



103, PI. v., PI. VII. 

 Platyceras cornutum, 76, 97, 102, 



PI. V. 

 Platyceras erectuni, 76, 98, 102, PI. 



V. 

 Pleurotomaria macccyi, 76, 81, 100, 



125, PI. II. 

 Pcecilobdallus forraosus, 38 

 Poeci'ometis ellipticus, 4 

 Poecilometis gibbiceps, 5 

 Poecilonietis S^ienceri, 24 

 Poroleda spathula, 112 

 Porphyry dyke, 159 



age of, 160 

 Port Cygnet, alkali rocks of, 154 

 Precocious fruiting, 172 

 Pristiophorus, 134 

 I'ristiophcrus lanceo'ata, 137, 141, 



PI. IX., fig. 5 

 PrlNtiophorus luulipinnis, 138 

 Pristis, 134 

 Pristis cudmorei. 139, 141, PI. IX., 



fig. 7 

 Pterygotus, 125 



I'eptilian dentary, opalized, 132 

 Respiration, regulation of, 115 

 Rhyparochromus acuminatus, 15. 

 Eispoa aurantiocincta, 110 

 iiissoa obeliscus, 109 

 Rissoa sniiillima. 109 

 Rochefortia anomala, 112 

 Roebournea diversa, 30 

 Sargus, 135 

 Sargus laticonus, 140, 141, PI. IX., 



fig. 9 

 Scalaetrochus ant iqiins, 7t), 9? 

 Scalaetrochns lindstroemi, 70, 94 

 Semen PsyP.ii, 148 

 Senna, 143 

 Silurian sediments. 



Petrology of, 40 



Composition of, 41 



Deposition of, 47 



Minerals of, 42, 43 

 Skeats, E. W., 154 

 Spilostethus pacificus, 33 

 Spilostethus mactans, 33 

 St. John's Wort, 145 



stem, malposition of, 165 



adhesion, torsion, bifurcation 

 and fasciation of, 166 

 Stenophyella sabulicola, 36 

 Straparollus debilis, 76, 92, 103, 101, 



PI. IV.. PI. VI. 

 Stropheodonta alata, 125 

 Strophonema, 125 

 Stylidium, 148, 149 

 Systelloderes aetherius, 16 

 Taphropeltus australis, 13 

 Temnodiscus pharetriodes, 76, 78, 



100, 102, PI. II., PI. VI. 

 Teratological notes, 165 

 Teredo brugueri. 111 

 Teredo fragilis. 111 



