INDEX TO SYSTEMATIC NAMES. 
859 
thracia conradi 
Thracia septentrionalis 
Thracia truncata 
Thraciidae 
Thuiaria argent ea 
Thuiaria cupressina 
Thuiaria thuja 
Thunnus thynnus 
Thyasira gouldii 
Thyasira trisinuata 
Thyone briareus 
Thy one fusus 
Thyone scabra 
Thyone unisemita 
Thyropus 
Thysanocephalum crispum 
Thysanocephalum ridiculum 
Thysanoessa inermis 
Thysanopoda inermis 
Thysanopoda norvegica 
Tiaridae 
Tiarina fusus 
Tiaropsis diademata 
Tilopteridaceae 
Tima formosa 
Tintinnidae 
Tintinnopsis beroidea compressa. . . . 
Tintinnopsis beroidea plagiostoma . . 
Tintinnopsis davidoffi 
Tintinnus 
Tomopteridae 
Tomopterus helgolandica 
Tornaiella puncto- striata 
Tornatijna canaliculata 
Tornatinidae 
Torpedo occidentals 
Tortanus bumpusii. 
Tortanus discaudata 
Tottenia gemma 
Tottenia manhattensis 
Trachelinidae 
Trachelobdella vividus 
Trachelocerca phcenicopterus 
Trachinocephalus myops 
Trachinotus argenteus 
Trachinotus carolinus 
Trachinotus falcatus 
Trachinotus goodei 
T rachinotus ovatus 
Trachurops crumenophthalmus 
Trachurus trachurus 
Trachydermon ruber 
Trachyncma digitate 
Trachynemidae 
Travisia carnea 
Trebius tenuifurcatus 
Trematoda 
Trentepohlia davicsii 
Trentepohlia virgalula var. secundata 
Trichiuridae 
Trichiurus lepturus 
Trichophrya salparum 
Trichosphaerium sieboldi 
Triforidae 
Triforis nigrocinctus 
Triglidae 
Trigonoporus folium 
Trigonostomum marki 
Page. 
Trilocularia gracilis 589 
T ristomum coccineum 585 
Tristomum laeve 585 
Tristomum molse 585 
Tristomum papillosum 585 
Tristomum rudolphianum 585 
Tritia trivittata 708 
Triticellidae 607 
Tritonofusus curtus 708 
Tritonofusus islandicus 708 
Tritonofusus stimpsoni 708 
Trochamminidae 549 
Trochidae 727 
Trochostoma oolitica 614 
Trophonia affinis 630 
Tropistemus glaber 676 
Tropistemus nimbatus 676 
Truncatella truncatula 721 
T runcatellid ae 721 
Truncatulina lobatula 551 
Truncatulina rosea 551 
Trygon centrura 739 
Trygon centrura 739 
Trypanosyllis 615 
Trypetesa lampas 644 
Trypetesidae 644 
Tryphosa pinguis 649 
Tubifex benedeni 634 
Tubifex hamatus 634 
Tubifex irroratus 634 
Tubificidae 634 
Tubularia couthouyi 565 
Tubularia crocea 566 
T ubularia larynx 566 
Tubularia parasitica 567 
Tubularia spectabilis 566 
Tubularia tenella 566 
Tubulariidae 565 
Tubulipora atlantica 597 
Tubulipora flabellaris 597 
Tubulipora liliacea 597 
Tubuliporidae 597 
Tucca corpulentus. 640 
Tucca impressus 640 
Tunicata 729 
Turbellaria 579 
Turbonilla aequalis 715 
Turbonilla areolata 715 
Turbonilla buteonis 716 
T urbonilla costulata 716 
Turbonilla elegans 715 
Turbonilla elegantula 715 
Turbonilla equalis. 715 
Turbonilla interrupta 715 
Turbonilla mighelsi 716 
Turbonilla nivea 715 
Turbonilla rathbuni 716 
Turbonilla stricta 715 
Turbonilla sumneri 716 
T urbonilla verrilli 715 
Turbonilla vineae 715 
Turbonilla winkleyi 716 
Turbonilla winkleyi senilis 716 
Turris episcopalis 562 
Turris vesicaria 562 
Turritella interrupta 715 
Turritidae 707 
Turritopsis nutricula 562 
Page. 
698 
698 
698 
698 
572 
573 
572 
749 
690 
690 
613 
614 
614 
614 
648 
589 
589 
663 
663 
663 
562 
554 
568 
811 
567 
555 
555 
555 
555 
555 
624 
624 
703 
703 
703 
739 
638 
638 
692 
692 
554 
635 
554 
743 
753 
753 
753 
753 
753 
752 
752 
702 
574 
574 
629 
642 
582 
813 
813 
750 
750 
556 
549 
717 
717 
765 
580 
581 
