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The mollusc (or mollusk [spelling 1]) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.
Higo, S., Callomon, P. & Goto, Y. (1999) Catalogue and Bibliography of the Marine Shell-Bearing Mollusca of Japan.Elle Scientific Publications, Yao, Japan, 749 pp. Herbert D.G. (2012) A revision of the Chilodontidae (Gastropoda: Vetigastropoda: Seguenzioidea) of southern Africa and the south-western Indian Ocean.
The ovate or oblong shell is compressed, and shows two rows of continuous varices, one on each side. The aperture is ova. The columella is arcuated, and ridged or crenulated. The siphonal canal is short and recuvred. The outer lip is crenated. The species of Bursa are mostly tropical, the majority being from the Eastern seas. They are found ...
List of shell-bearing mollusks observed and collected at Lizard Island, Great Barrier Reef, Australia, Tryonia, 4: 1-32. LIRS catalog number 403 Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist of The Molluscs of Singapore (pdf), Raffles Museum of Biodiversity Research, National University of Singapore
The genus name Xenophora comes from two ancient Greek words and means "bearing (or carrying) foreigners". The shells are small to rather large (diameter of base without attachments 19–160 mm; height of shell 21–100 mm), depressed to conical, with narrow to wide, simple to spinose peripheral edge or flange separating spire from base.
The shell consists of 4 convex whorls, with the posterior ones typically left and greener, while the others exhibit rounded varices. The aperture is ovate, slightly widened towards the anterior end. The outer lip is sharp, and the columella displays a distinctive orange hue.
Laseron, C. 1959. The family Pyramidellidae (Mollusca) from northern Australia. Australian Journal of Marine and Freshwater Research 10: 177-267, figs 1-213; Higo, S., Callomon, P. & Goto, Y. (1999) Catalogue and Bibliography of the Marine Shell-Bearing Mollusca of Japan. Elle Scientific Publications, Yao, Japan, 749 pp. page(s): 356
Drawing of a shell of Isanda murrea: Scientific classification ... P. & Goto, Y. (1999) Catalogue and Bibliography of the Marine Shell-Bearing Mollusca of Japan. Elle ...