SYSTEMATIC INDEX. 



11 



80. Tellina Fabula. Streaked-shelled Tellina, 



FAMILY IX. SOLENINA, 



26. SOLEX. SOLEX, 



81. Solen Siliqua. Razor-case Solen, 



82. Solen Ensis. Sabre-case Solen, 



83. Solen pellucidus. Pellucid Solen, 



27. PSAMMOBIA. PSAMMOBIA, . 



84. Psammobia Feroensis. Feroese Psammobia, 



28. Saxicava. Saxicava, 



85. Saxicava rugosa. "Wrinkled Saxicava, . 



86. Saxicava arctica. Arctic Saxicava, 



FAMILY X. MACTRINA, 



29. Mactra. Mactra, 



87. Mactra stultorum. Simpleton's Mactra, 



88. Mactra solida. Thick-shelled Mactra, . 



89. Mactra elliptica. Elliptical Mactra, 



90. Mactra subtruncata. Small Triangular Mactra, 



30. GOODALLIA. GOODALLIA, 



91. Goodallia triangularis. Denticulate Goodallia, 



92. G oodallia minutisshna. Edentulate Goodallia, 



31. LUTRARIA. LUTRAEIA, 



93. Lutraria elliptica. Elliptical Lutraria, . 



94. Lutraria Listen. Lister's Lutraria, 



32. Amphidesma. Amphidesma, 



95. Amphidesma album. "White Amphidesma, 



96. Amphidesma tenue. Triangular Amphidesma, 



97. Amphidesma prismaticum. Iridescent Amphidesma, 



32. Axatixa. Axatixa, 



98. Anatina prsetenuis. Delicate Anatina, 



99. Anatina truncata. Truncated Anatina, 



34. Thracia. Thracia, 



100. Thracia declivis. Sloping Thracia, 



101. Thracia pubescens. Roughish Thracia, 



35. Ervilia. Ervilia, 



102. Ervilia pellucida. Pellucid Ervilia, 



■30. 



37 



FAMILY XI. MYINA, 

 Mya. Gaper, 



103. Mya truncata. Abrupt Gaper, 



104. Mya arenaria. Sand Gaper, 



105. Mya ovalis. Oval Gaper, 



Lyonsia. Lyoxsia, 



106. Lyonsia Norwegica, Pearly Lyonsia, 

 38. Sphexia. Sphenia, 



107. Sphenia Swainsonii. Swainson's Sphenia, 



108. Sphenia costulata. Ribbed Sphenia, 



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