60 BIVALVES—OSTREA. 
Varieties of Ostreze 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. 
"Oorpeov (Oyster) is the name given to this genus by 
the antient naturalists. 
Division I.— Valves with ears equal. 
Famity 1.—Valves ribbed, upper valve flat. 
Scientific Name. Locality. Common Name. 
Maxima ---+«+-- European Seas --+------ Greatest Scallop 
Jacobzea ---++++ Britain, Mediterranean-- Lesser: -- -- do -- 
Ziczac --++++ sees WestIndies, Red Sea---- Zigzag ---- do - 
Striatula -----+-- Indian Ocean------+- +++ Sixteen rayed do - 
Vita talcceriecete sickens DiftOrccisis 5 AOUOD O00 00 Minute---- do -- 
Famity 2.—Valves ribbed, ears equal. 
Hybrida bAod ld ao Norway slalejelele eisiietelele tele e Hybrid DAO ivan 
Radula --------- Amboyna, China -- ---- Rasp-+-+-+ do -- 
Imbricata -----+- Red Sea--++e+e+ + seeeee Imbricated do -- 
Plica -+++ +--+ ess Amboyna, Indian Ocean- Folded ---- do -- 
1ehehich Ommocouogs Norway oldunleletesisialeie elietenese Gaping- poet) Oe 
Famity 3.—Valves flattish on one side and gaping. 
Lima -:--+-- ---- Ceylon, Mediterranean, 
RediSGaircistaicasien etelecc IP ile@vetetetetare Gok 
Fasciata -----.-- Britain, West Indies, Cape 
of Good Hope -------- Banded---- do +- 
Bullata -.--....- Mediterranean-----...-- Swollen --- do -- 
Fragilis ----..... Nicobar Isles-- -++++++- Brittle ---- do - 
Scabra -. ------ West Tndiesiery cscs ee ere « Rough Sn00 ils) Aes 
Glacialis ----.--. St. Domingo, Mediterran. Icy ------- do -- 
Excavata ----+.. Norway sta fete ei hevalebeterelcle se Hollow --- do-- 
* Loscombia:-.-- Devonshire -----+....-- Loscomb's« do - + 
