VI 



CONTENTS. 



CHAPTER II.— THH TEST ACE A,— continued. 



Section I. — ^Univalves, — continued. 

 Velutina l^vigata, 

 Cypr.ea EuropvEa, 

 Natica alderi, 

 Trochus, 



1. Trochus cinerarids, . 



2. Trochus zizyphinus, 

 Turbo, 



Turbo quaduifasciatus, 

 Turbo senior, 



Helix pereger (peregrinus), 

 Physa fontinalis, 



LiMNiEUS ? . 



Miscellaneous, 

 fusus cokneus, 



Reticulated Shells, 

 buccinum macula, 

 murex attenuatus, 



Flattened Spiral Testacea, 



PlANORBIS INCONSPICUA, 



Planorbis spirorbis, 

 Planorbis khombeus, 

 Planorbis carinatus, 

 Pllnorbis imbricatus, 

 Valvata obtusa, 



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CHAPTER III.— I5IVALVE SHELLS, 



I. Mytilos, — The Mussel, 



Mvtilus edulis, .... 



Mvtilus pellucidus, 



Mytilus poLYiioKPiius, — (Drcissena polymorphaj , 

 i. Modiola, ..... 



Mytilds modiolus, Linn. — (Modiola modiolus), — The Horse 

 Mussel, ...... 



Modiola barbata, — The Bearded Mussel, . 



Modiola discrepans, — The Corded or Corduroy Mussel, 

 3. Anodon avonensis, — (A. cygneusj, 

 ■I. Cyclas cornea, ..... 



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