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947 



Trinacria 603, 6oj, 606. 



Baiuloni 605. 



carinifera 604. 



cuneus 604. 



dccisa 658. 



ledoidea 604. 



Mcekii 604. 



mixta 605. 



pectuncularis 577i 604, 606, 



607. 



Triquelra 910. 

 Trisidos 616. 

 Trisis 616. 

 Tuceta 607. 

 Tugonia S6o, 890. 

 Tugoniapsis 860. 



coinpacta 860. 

 Turritella 780. 



gatunensis 895. 

 Unio 572, (>SX, "89, 857. 



liuckleyi 6SS. 



caltotatnsis <>S8. 

 I inoniiUe 688. 

 Unioiuim 57-!, (K..S. 

 Vanganella 889. 



Taylori SN ,. 

 Variainubium OyS. 

 Veleila 878. 



Hntea 879. 



Venericla- 908. 

 Volsclla 786. 



striata 797. 



ll'iikullina 77^, 774, 777. 

 Xylopliaya S-'t, NJJ. 



ilorsalis S2I. 



inississi|)|iicnsis S2I. 

 Xylupliagus 812, 821. 

 Xylotomea 821. 

 Xylolrya palmulata 813. 

 YuMia 580, /(y, 594. 



abrupta 5<)4- 



albaria 585, 586, 594. 



Aldrichiana 594. 



angularis 594. 



arctica 593, 594, 595- 



claibornensis 594, 596. 



Cooperi 594. 



corpulentoidea 594- 



Crosbyana 594. 



eborea 594. 



Jraler 596. 



glacialis 593, 594. 595. 5'ji>. 



liypcrliorca 594, 595. 



inipressa 594. 



Kiiullci 594. 



Uevis 594, 595, //>, 597- 



lanceolata 595. 



limatula 594, 596, 597. 



Yoldia, confii. 



lucida 595. 



iiHintcreycn>is 595. 



nastita 594. 



oval is 594- 



poinpllul) \ 582. 



porllanclica 593, 594. 



prolexta 585, 586, 594. 



psammottea 596. 



sapotilla 597. 



scapania 580. 



scapina 595. 



scissurata 595. 



serica 594. 



tarpixia 597. 



thraciaiformis 594, 595, 596. 



truncata 594, 595. 

 Yoldiella 595. 

 Xcnatia SS8, 891. 



acinaces 888. 



IVshayesii 888. 



zelanilica 888. 

 Zenotiime .v/,-, ,v,y,v, 891. 



7.irfca8l5, S/7, 818. 

 crispata SiJ, 818. 

 dcnlata 818. 

 Gabbii 8 1 8. 

 plana 818, 820. 

 (see Zirfiua). 



FINAL NOTE. 



The manuscript of this paper was sent in for publication April 3, 1898, anil the printing com- 

 pleted October 15, 1898. The plates of higher number than Plate XXXV., to which a few references 

 appear in the text, will be issued with Part V. 



ERRATA. 



Page- 571, line 13, for " Colonnianum" read Calonniammi. 



Page 638, line 5, for " Plate 36" read Plate 32. 



Page 688, line 15, for " Figures 6, \2a" read Figures 5, 12//. 



