Notes on the Collection 81 



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among the bivalves as the Cypraeidae among the uni- 

 valves. Beauty of color and of sculpture distinguish 

 most of the forms. This series of selected 'specimens 

 is impressive. There are Chione lamellata with wonder- 

 ful frills (a remarkably fine specimen, by the way), and 

 Dione lupanaria with long terete spines, the polished 

 Callistas and the criss-crossed Circes, with the brilliant 

 purples and scarlets and oranges of some species and 

 the soft pink-browns and wood-tints of others, — another 

 opportunity for the student of adaptive variation ! 

 The genera represented (formerly all included under 

 "Venus," "Cytherea," "Tapes," and "Artemis") are 

 chiefly Mercenaria, Anaitis, Cryptogramma and Chione, 

 Tivela, Meretrix, Callista, Caryatis, Dione, Amiantis, 

 Lioconcha, Crista and Circe, Sunetta, Dosinia and 

 Cyclina, Tapes and Venerupis. A very rare form, 

 from the "Challenger" expeditions, is Venus torresiana, 

 Smith, from Torres Straits. Tapes phenax, Pilsbry, is 

 a new species from the Loo Choo Islands. 



Passing some small families, several of them repre- 

 sented by all the known species, and a few of larger size, 

 including the fresh-water Cyrenidae, Sphaeriidae, 

 and Pisidiidae and the marine Cardiidae, an inter- 

 esting family represented by many fine specimens, 

 we come to the rare Isocardiidae (six [species shown) 

 and the divergent Chamidae. Eighteen species of 

 Chama are here, including unusually fine examples 

 of the highly prized Chama lamellosa, and the chrysan- 

 themum-like Chama macrophylla, Ch. lazarus, and 



