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536 GEOGRAPHICAL ZOOLOGY. [part iv.
Family 14.—VENEKID.E, (10 Genera, 600 Species.)
Distribution.—Universal. Lucinopsis is confined to the
North Atlantic ;
Olauconeza to the mouths of rivers in the Orien-
tal region ; Meroe and Trigona to warm seas. There are about
350 fossil species, ranging back to the Oolitic period.
Family 15.—MACTRID^. (5 Genera, 147 Species.)
Distribution.—All seas, but more abundant in the Tropics.
Gnathodon is found in the Gulf of Mexico ; Anatinella in the
Oriental region. There are about 60 fossil species, ranging back
to the Carboniferous period.
Family 16.—TELLINID^. (11 Genera, 560 Species.)
Distribution.—All seas ; most abundant in the Tropics.
Galatea is confined to African rivers. There are about 60 fossil
species, mostly Tertiary, but ranging back to the Carboniferous
period.
Family 17.—SOLENID^. (3 Genera, 63 Species.)
Distribution.—All Temperate and Tropical seas. There are
80 fossil species which range back to the Carboniferous epoch.
Family 18.—MYACID^. (6 Genera, 121 Species.)
Distribution.—All seas. Panopma inhabits both North and
South Temperate seas ; Glycimeris, Arctic seas. There are near
350 fossil species, ranging back to the Lower Oolite formation.
Family 19.—ANATINID^. (8 Genera, 246 Species.)
Distribution.—All seas. Pholadomya is from Tropical Africa
Myadora from the Western Pacific ;
Myochama and Chamostrma
are Australian. There are about 400 fossil species, ranging back
to the Lower Silurian formation.
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