80 The Williams Collection oj Shells 



tion, with allied forms of the genera Pholas, Monothyra, 

 Talona, Zirphaea, Jouannetia, Pholadidea, Netasto- 

 mella, and Martesia, and beside them the marvelous 

 tube-building species of Aspergillum and Fistulana. 

 Many of the Pholads possess supplementary "valves" 

 to the shell, notable among these being a fine Pholadidea 

 papyracea preserving the siphonoplax. 



The "razor-shells" (Solenidae) are displayed in a 

 variety of genera, including Solen, Ensis, Pharus, 

 Pharella, Siliqua, Macha, and Tagelus. Solen roseoma- 

 culatus, Pilsbry, is a new species from Japan. 



The Saxicavidae, Corbulidae, Myacidae, Ana- 

 tinidae and Mactridae are present and also the 

 very rare Pholadomya vitrea from the Caspian Sea, 

 sole survivor of its race. 



In the smaller-sized though better-favored Telli- 

 nidae are many forms of great delicacy and beauty. 

 Some are so fragile and so pink that they serve the 

 clever Japanese for rose petals on screens and jewel- 

 boxes, while others are familiar everywhere in their 

 auroral rays, as "sunrise shells." The collection con- 

 tains forty-four species of Tellina, fourteen of Donax, 

 besides various specimens of Asaphis, Gari, Sanguin- 

 olaria, Hiatula, Elizia, Angulus, Strigilla, Macoma, 

 Iphigenia, etc. Tellina subpallida, Smith, is a new 

 species from Aden. The Semelidae are represented 

 by Scrobicularia and Semele. 



The "Venus shells" (Veneridae) are as lovely 



