192 UNIVALVES DENTALIUM. 



cidiim is very narrow and thin, and is of a pale topaz 

 color ; it is remarkable that this shell does not effer- 

 vesce in acids. 



The Dentalia are principally found in the Indian and 

 European oceans ; and a few in the Mediterranean and 

 Northern seas. 



The term Dentalium has been applied to this genus, 

 from the marked resemblance which its species bear to 

 a tooth (Dens). 



Family 1. — With longitudinal ribs. 



Scientific Name- Locality. Common Name. 



Rectum Indian Seas Straight Tooth S. 



Elephantinuni • • • Indian & European Seas, 



Mauritius • Elephant's- do •• 



Aprinum Indian Seas White ribbed do 



Striatum Sicily, Cornwall Striated • • do • • 



Dentalis Mediterranean, Amboyiia, 



West of England Curved striated do 



Fasciatum • Sicily Banded • • • do • • 



Imperforatum • • • Sandwich, Falmouth • • Minute-truncated 



Family 2.-^With annular strict. 



Politum India, Sicily Ring-striated do • 



Eburneum India Smooth- ivory do • 



Trachea Milton in Devonshire • • Minute Windpipe 



Family S.— Smooth. 



Entalis Britain, India, Norway • • Common • • do • • 



Corneum African Ocean Horn-color'd do • • 



Gadus British Channel Hake's do • • 



Minutum Mediterranean, Devon • • Minute do • • 



Pellucidura North Sea Pellucid • • . do • • 



