vi CONTENTS. 



CHAPTER II. THE TESTACEA, continued. 



SECTION I. UNIVALVES, continued. 



VELUTINA L^EVIOATA, . . PAGE 35 



CYPR.EA EUROP^EA, ... 36 



NATICA ALDERI, . 37 



TROCHUS, 



1. TROCHUS CINERARIUS, . . ib. 



2. TROCHUS ZIZYPHINUS, 



TURBO, . . . 40 



TURBO QUADRIFASCIATUS, . ib. 



TURBO SENIOR, 



HELIX PEREGER (PEREGRINUS), 42 



PHYSA FONTINALIS, 



LIMN.SUS? ... 44 



MISCELLANEOUS, . ib. 



Fusus CORNEUS, . . . ib. 



RETICULATED SHELLS, . 45 



BUCCINUM MACULA, . ib. 



MUREX ATTENUATUS, . 46 



FLATTENED SPIRAL TESTACEA, . ib. 



PLANORBIS INCONSPICUA, . . 47 



PLANORBIS SPIRORBIS, 



PLANORBIS RHOMBEUS, . . 50 



PLANORBIS CARINATUS, 



PLLNORBIS IMBRICATUS, . 53 



VALVATA OBTUSA, . 'b. 



CHAPTER III. BIVALVE SHELLS, 



1. MYTILUS, The Mussel, 



MYTILUS EDULM, 



MYTILUS PELLUCIDUS, 



MYTILUS POLYMORPHUS, (Drelssena polymorpha) , 66 



2. MODIOLA, . ... 



MYTILOS MODIOLUS, Linn. (Modlola modiolus) ,The Hone 



Mussel, . . ib - 



MODIOLA BARBATA, The Bearded Mussel, . 67 



MODIOLA DISCREPANS, The Corded or Corduroy Mussel, 68 



3. ANODON AVONENSIS, (A. cygneus), ... "b. 



f Q 



4. CYCLAS CORNEA, 



