60 BIVALVES — OSTREA. 



Varieties of Ostreae are found in almost every part of 

 the world, but the most rare in the Indian seas ; among 

 which may be mentioned, the varieties of the O. mal- 

 leus, O. pallium, and O. spondyloides. 



''Oarpeov (Oyster) is the name given to this genus by 

 the antient naturalists. 



Division I.— Valves with ears equal. 



Family 1. — Valves ribbed, upper valve flat. 



Scientific Name. Locality. Common Name. 



Maxima European Seas Greatest Scallop 



Jacobsea Britain, Mediterranean- • Lesser do • • 



Ziczac West Indies, Red Sea • • • • Zigzag • • • • do • • 



Striatula Indian Ocean Sixteen rayed do • 



Minuta Ditto - Minute- • • • do - • 



Family 2. — Valves ribbed, ears equal. 



Hybrida Norway Hybrid do - • 



Radula Amboyna, China Rasp do - • 



Imbricata Red Sea Imbricated do • • 



Plica Amboyna, Indian Ocean- Folded - • • • do • • 



Hians Norway Gaping - ... do • • 



Family 3.~-Vahes flattish on one side and gaping. 



Lima Ceylon, Mediterranean, 



Red Sea ^ • • - - » File do - ■ 



Fasciata Britain, West Indies, Cape 



of Good Hope Banded • • • . do • 



Bullata Mediterranean Swollen - • • do • 



Fragilis Nicobar Isles Brittle do • 



Scabra West Indies Rough do • 



Glacialis St. Domingo, Mediterran. Icy do • 



Excavata Norway Hollow • • • do • 



* Loscombia Devonshire Loscomb's • do • 



