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Troca male
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).
Caroline Is.:
Recently Mr. C. N. Cate presented me two walkeri from Moen Is. in the Truk Is. (coll. Schilder No. 17135 and 17136); they
formerly belonged to a series of fifteen similar shells dredged by R. Willis in the harbour in January 1962. These two shells
are "pellucid" like the dead glossy cowries dredged in Honolulu harbour, and exhibit a similar white chalk in the aperture:
there, the conditions of preservation in the harbour of Moen Is. must be about equal to those in Honolulu. The specimens
undoubtedly belong to walkeri (surabajensis) and not to bregeriana: the discovery of this far-off population of walkeri in
the central Caroline Is. is not very surprising, as other typically Malayan cowry species also spread to western Micronesia,
e.g. Erronea ovum Gmelin and E. onyx Linnaeus to Palau and Guam respectively.
Northern Melanesia:
Mrs. K. Matcott of Mooloolaba, Queensland informed me by letter in March 1963, that she possesses a "surabajensis" from New
Britain; as I have never examined the shell personally, the reliability of this indication seems to need confirmation.
The animal: The riving animal observed by Mrs. Couacaud, was as follows: The sole of the foot reddish-orange, dorsum of foot
bright red. Mantle bright red, with minute black spots, giving it a darker appearance; on close observation it could be seen,
that the black spots were set out in small circles around the papillae, recalling somewhat the design of the shell. The
majority of papillae were bright red a few (about 8) were whitish, and surrounded with minute white specks at the base;
papillae were short and simple, not exceeding 1 mm in length. Siphon red, tentacles bright red and pointed.
The description of the animal of C. esontropia, agrees almost in detail with that of C. cribraria from Fiji (see The Veliger,
1964, 6(4):199).
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