Platylepas bissexlobata 428 2. Platylepas decorata 429 Species Dubiæ 430 10. Genus Tubicinella 430 1. Tubicinella trachealis 431 11. Genus Xenobalanus 438 1. Xenobalanus globicipitis 440 Sub-Family Chthamalinæ 446 12. Genus Chthamalus 447 1. Chthamalus stellatus 455 Var. communis, fragilis, depressus 2. Chthamalus antennatus 460 3. Chthamalus cirratus 461 4. Chthamalus fissus 462 5. Chthamalus dentatus 463 6. Chthamalus Hembeli 465 7. Chthamalus intertextus 467 8. Chthamalus scabrosus 468 13. Nov. Genus Chamæsipho 470 1. Chamæsipho columna 470 2. Chamæsipho scutelliformis 472 14. Nov. Genus Pachylasma 475 1. Pachylasma giganteum 477 2. Pachylasma aurantiacum 480 15. Genus Octomeris 482 1. Octomeris angulosa 483 2. Octomeris brunnea 484 16. Genus Catophragmus 485 1. Catophragmus polymerus 487 2. Catophragmus imbricatus 490 Remarks on Bronn's List of Fossil Balaninæ and Chthamalinæ 492 Family Verrucidæ 495 Genus Verruca 496 Powers of Excavation 512 1. Verruca Strömia 518 2. Verruca lævigata 520 3. Verruca Spengleri 521 4. Verruca nexa 522 5. Verruca prisca 525 Family Lepadidæ 526 Genus Alcippe 529 Alcippe lampas 530 Female 530