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White abalone
Tearing up a coral-head such as seen in the left center of the picture stirs up a lot of silt and at times reduces visibility
to only a few inches. Collecting from such areas is usually for a SCUBA equipped diver.
To insure finding the shells in such a coral-head I follow a simple technique. First the area surrounding the coral-head is
checked for shells such as miters and Terebra. The smaller coral pieces are turned over and checked for shells. Most Murex
pele and both Cypraea cernica that I have collected were attached to the under side of small, isolated pieces of coral. After
checking for shells these are thrown clear of the area surrounding the larger coral head which I systematically start tearing
to pieces.
Distribution: The areas from which walkeri has been known to the writer till 1941 have been marked by black circles (walkeri)
and triangles (bregeriana) in the map: The three races of walkeri mentioned above seem to be separated by zones uninhabited
by the species. However, after World War II many new localities became known to us which fill up these gaps, or extend the
limits in northern, eastern, and southern direction. Therefore the following areas should be added, which have been marked,
on the map, by empty circles and triangles respectively:
Andaman Is.:
one pale surabajensis in the museum of Calcutta, sent to me for examination by Dr. Ray in 1957, it came from an old
collection, but the "A'' written originally on the base of the shell makes the correctness of indication rather probable.
Western Sumatra:
two typical walkeri collected in West Sumatra by Aurivillius in 1891, personally examined in the museum of Stockholm in 1957.
- These two areas close the gap between Lemuria and Malaysia.
North West Australia:
one shell (17 mm.) from Peak Is. in the Dampier Archipelago, collected by the Davina Expedition in 1960, presented me (coll.
Schilder No. 11862) by Ray Summers; some more specimens seem to have been collected in the Dampier Archipelago by this
expedition. Besides, walkeri has been mentioned from Nickol Bay by Brazier (1879, Journ. Conch. 2:321).
North Australia:
Yirrkala in Eastern Arnhem Land, according to Iredale (1939, Austr. Zoologist 9:299). - These two areas extend the occurrence
of walkeri to tropical Australia west of Torres Strait.
Aru Is.:
one shell (19 mm.) recalling the western walkeri has been collected by Merton in 1908, personally examined in the Senckenberg
museum in Frankfurt on Main, Germany. - This locality closes the gap between Misool (Schepman 1909, Siboga Exped. 49/2/2:133)
and Torres Strait (Brazier 1879). The indication "New South Wales'' by Iredale (1935, Austr. Zoologist 8:127) needs
confirmation, the southernmost reliable indication in East Australia seems to be Peel Is. in Moreton Bay.
Ryu-kyu Is.:
Kuroda (1960, Cat. Moll. Fauna Okinawa, p. 21) mentioned "walkeri surabajensis" from Okinawa Is.; the indication seems
correct, as P. W. Clover enumerated two specimens of walkeri from "South of Japan'' in a manuscript list of cowries preserved
in Japanese collections (communicated to the writer by Mr. Ray Summers in 1961).
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