90 THE NAUTILUS. 



Slipper Shell for C. plana, and the Cup and Saucer Limpet for 

 Crucibulum striatum, also the Tortoise Shell Limpet for Acmaea 

 testudinalis. 



Among the bivalves there is also much confusion in the 

 popular names, due to the restricted use of the names clam, 

 mussel etc. In New England the Clam is Mya arenaria and 

 Vemis mercenaria is known as the Quahaug. In the New York 

 market the former is called the Soft Shell Clam and the latter 

 the Clam or Hard Shell Clam. The Little-neck Clam is the 

 young of Venus mercenaria. The terms Long Clam and Round 

 Clam are also used for the two species. To avoid confusion it 

 seems best therefore to adapt a double name applicable to the 

 entire coast, the Long Clam or Soft Shell Clam for M. arenaria 

 and the Round Clam or Quahaug for V. mercenaria. To the 

 other species, Mya truncata, the name Truncate Clam might be 

 applied. Spissula solidissima {Mactra solidissima) is usually 

 referred to as the Surf Clam, also locally as the Beach or Hen 

 Clam. Area campechiensis and its Var. pezata are called the 

 Bloody Clam from the color of its gills and circulatory fluids. 

 To Venericardia borealis (Cardita borealis) Dr. Mayer has given 

 the name Cod Clam, as it constitutes one of the foods of the 

 cod. To the Astartidae the term Little Brown Clams seems 

 appropriate and to the species Astarte castanea the Chestnut Clam 

 and to A. undata the Wavy Clam. Cyprina islandica known on 

 the New England coast as the Black Quahaug might also be 

 known as the Round Black Clam. Soleviya velum has been 

 called by Dr. Mayer the Swimming Clam, from the ability of 

 the animal to move through the water for a considerable distance 

 without touching the bottom. This habit is more fully elabo- 

 rated by Professor Edward S. Morse in connection with the large 

 Northern Swimming Clam, S. borealis (Biol. Bull., xxv, 261, 

 1913). To the long narrow species the term clam is usually 

 replaced by the word shell, thus Ensis directus Conr. {E. ameri- 

 canus Gld. ) is known as the Razor Shell. The fisherman of 

 New England call it the " Skate rock." To Siliqua costata have 

 been applied various names such as Sand-bar Clam, Flat Razor 

 etc. I prefer the name Ribbed Pod-shell. For Cyrtodaria siliqua 

 ( Glycymeris siliqua) the name Northern Pod-shell. Tagelus 



