56 



BIVALVES. OSTREA. 



of traffic, that the greatest care is taken to promote their 

 generation and growth. By proper management their 

 multiplication becomes immense. They are often formed 

 into large layers or beds, extending many miles; which, 

 in favorable seasons, prove a submarine mine of wealth 

 to their proprietors. 



Almost all seas abound with Ostrese. The Ostrea di- 

 luviana is found fossil in the calcareous mountains of 

 Sweden. 



OSTREA. — Oyster or Scallop. 



A. — Valves furnished with ears, and radiated. — Scallop. 

 a. — Equilateral; ears of the valves equal. 



♦Maxima — Common. 

 *Jacobaea — Mediterranean. 

 Ziczac — Zigzag. 

 S triatula — Fain t-rayed. 

 Minuta — Minute. 

 Pleuronectes — Compass. 

 Laurentii — Lorenzo's. 

 Japonica — Japan. 

 Magellanica — Magellan. 

 H y brida — Norway. 

 Radula — Royal Mantle. 

 I mbrica ta — Im hricated. 

 Subrotunda — Roundish. 

 Tlica— Folded. 

 Crenata — Crenated. 

 * Sinuosa — Distorted. 

 Squamosa — Scaly. 

 Dubia — Doubtful. 

 *Subrufa — Reddish. 

 Versicolor — Variegated. 



Rosea — Rosy. 

 Fusca — Brown. 

 Tenuis — Thin. 

 Lutea — Muddy. 

 Muricata — Muricated. 

 C onsp ersa — Dotted. 

 Nodulosa — Nodulous. 

 Radiata — Radiated. 

 Punctata — Spotted. 

 Aculeata — Prickly. 

 F\ana— Flat. 



Pusilla — Minutely striated. 

 Flavescens — Yellowish. 

 Flabellum — Fan-like. 

 Spondyloides — Spondylus^ 

 Violacea — Violet. 

 Aurantia — Orange. 

 Vittata — Filleted. 

 Miniata — Red-spotted. 

 Inflata — Inflated. 



