TABLE OF CONTENTS. 



Introduction, treating of the parts of the 

 Pelecypod : 



I'AOB 



The Valves 486 



The Hinge Teeth 490 



The Steinrnann Formula 492 



Types of Teeth 492 



The Pholad myophore 496 



The Ligament and Resilium 497 



The Adductor Muscles 503 



The Siphons 503 



The Gills or Branchia 504 



The Heart 506 



The Nephridia 507 



The Foot 507 



The Prodissoconch 508 



General Classification of the Pelecy- 

 poda : 



Class Pelecypoda 511 



Order Prionodesmacea 511 



Order Anomalodesmacea 512 



Order Teleodestnacea .. 512 



The Paleoconcha 513 



Order Prionodesmacea 515 



Superfamily Solemyacea 515 



Family Soletnyidie 515 



A. Ta.xodonta 515 



Superfamily Nuculacea 515 



Family CtenodoutidcC? 515 



Family Nuciilitke 516 



Family Ledicke 516 



Superfamily Arcacea 516 



Family Macrodontidae 516 



Family Cyrtodontid* 517 



Family Limopsidie 517 



Family Arcida- 517 



B. Schizodonta 518 



Superfamily Pteriacea 518 



Family Pterineidae 518 



Superfamily Pteriacea, continued. 



\- H.I-. 



Family Anibonychiidie 518 



Family Pinnidoj 519 



Family Conocardiida: 519 



Family Penmke 520 



Family Pteriidie 520 



Family Vulsellidce 520 



Superfamily Ostracea 520 



Family Ostn-idaa 521 



Family Kliginid;e 521 



Superfamily Naiadacea 5,21 



Family Cardiniid;e 522 



? Family Megalodontida,- 522 



Family Unionida: 522 



l'"amily Mutelidue 523 



Family Ktheriida.- 523 



Superfamily Trigoniacea 524 



Family Lyrodesmicku 524 



Family Trigoniida; 524 



C. Isodonta 524 



Superfamily Pectinacea 524 



Family Pectinidae 525 



Family Spondylidae 525 



Family Dimyidas 526 



Family Limidas 526 



Superfamily Anomiacea 526 



l''amily Anomiidx 527 



D Dysodonta 527 



Superfamily Mytilacea 527 



Family Modiolopsido; 527 



Family Mytilidae 528 



Family Dreissensiida^ 528 



Family Modiolarcidae 528 



Family Prasinidae? 529 



Order Anomalodesmacea 529 



Superfamily Anatinacea 530 



A. Eusiphonia 530 



Family Ceromyidie 530 



