9. Chama 50 In tropical seas on coral reefs.
10. Tridacna 7 Indian and Pacific Oceans, Chinese Seas.
11. Cardium 200 World-wide--from the shore line to
140 fathoms.
12. Lucina 70 Tropical and temperate seas--sandy and
muddy bottoms--from low water to
200 fathoms.
Kellia 20 Norway, New Zealand, California--low
water to 200 fathoms.
13. Cyclas 60 Temperate regions--in all fresh waters.
Cyrena 130 From the Nile and other rivers to
China--and in mangrove swamps.
14. Astarte 20 Mostly Arctic--from 30 to 112 fathoms.
Crassatella 34 Australia, Philippines, Africa, etc.
15. Cyprina 1 From Britain to the most northerly
point yet reached--from 5 to
80 fathoms.
Circe 40 Britain, Australia, India, Red Sea--
8 to 50 fathoms.
Isocardia 5 Mediterranean, China, Japan--burrowing
in sand.
Cardita 54 Tropical seas--from shallow water to
150 fathoms.
16. Venus 176 } World-wide--buried in sand, from low
Cytherea 113 } water to 100 fathoms.
Artemis 100 Northern to tropical seas--from low
water to 100 fathoms.
Tapes 80 Widely distributed--burrowing in sand,
from low water to 100 fathoms.
Venerupis 20 Britain, Canaries, India, Peru--in
crevices of rocks.
17. Mactra 125 World-wide--burrowing in sand.
Lutraria 18 Widely distributed--burrowing in sand.
18. Tellina 300 In all seas--from the shore line to
15 fathoms.
Psammobia 50 Britain, Pacific and Indian Oceans--
from the littoral zone to 100 fathoms.
Sanguinolaria 20 W. Indies, Australia, Peru.
Semele 60 Brazil, India, China, etc.
Donax 68 Norway, Baltic, Britain--in sand near
low water mark.
19. Solen 33 World-wide--burrowing in sand.
Solecurtus 25 Britain, Africa, Madeira,
Mediterranean--burrowing in sand.
20. Mya 10 North Seas, W. Africa, Philippines,
etc.--river mouths from low water to
25 fathoms.
Corbula 60 United States, Britain, Norway,
Mediterranean, W. Africa, China--
from 15 to 80 fathoms.
21. Anatina 50 India, W. Africa, Philippines,
New Zealand.
Thracia 17 Greenland to Canaries and China--from
4 to 120 fathoms.
Pandora 18 Spitzbergen, Panama, India--from 4 to
110 fathoms, burrowing in sand and mud.
22. Gastrochaena 10 W. Indies, Britain, Red Sea, Pacific
Islands--from shore line to 30 fathoms.
Saxicava Arctic Seas, Britain, Mediterranean,
Canaries and the Cape--in crevices
and boring into limestone and rocks.
Aspergillum 21 Red Sea, Java, New Zealand--in sand.
23. Pholas 32 Almost universal--from low water to
25 fathoms.
Xylophaga 2 Norway, Britain, S. America--boring
into floating wood.
Teredo 14 In tropical seas--from low water to
100 fathoms.