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Maxima clam
Our most exciting and productive trip so far began on June 11, 1963, when my friend Mary Hartman and I left Fort Myers bright
and early (5:45 am.) for four days in Marathon. We arrived at our regular headquarters, The Ranch House Motel, about 10:30
and were warmly greeted by our friends and hosts, Chuck and Sylvia Soumar, who filled us in on the latest shelling news.
Mary and I quickly changed to our swim suits, took our snorkels and started out for our familiar places where we found the
usual live Strombus gigas (all juveniles), Strombus raninus, Fasciolaria tulipa, Astraea longispina, brevispina and
americana, Pinna carnea, Nerita peloronta, versicolor and tessellata to name a few. Some of the new species for us this time
were one Prunum carneum so bright and pretty, one lovely pink Tegula, one Conus spurius atlanticus and many beautiful little
Neritina virginea which fascinated us with their many different patterns.
This was our first time to use snorkels and they opened up a new world for us. The water was beautifully clear and the
gorgonians, plume grasses, sea whips, sponges, coral, brilliantly colored tropical fish, huge sea urchins some with jet
black bodies and spines 6 to 8 inches long, others with scarlet red bodies and black spines or red bodies and red spines
kept us entranced so that we sometimes forgot to look for shells.
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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