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→Description: Crepidula norrisiarum is current name, and not sure that is what it is. |
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==Description==
[[Image:Norrisia norrisii SIL1.jpg|left|thumb|''Norrisia norrisii'' shell with a slipper shell
''Norrisia norrisii'' has a wide, solid, [[exoskeleton|shell]] that ranges in size from a few mm in juveniles up to 59 mm in adults, as measured across the greatest shell dimension.<ref name=SIL1>Lonhart, S.I. 1996. The vertical distribution and diel migration of ''Norrisia norrisii'' on Macrocystis pyrifera at Santa Catalina Island. Master of Science thesis, California State University at Long Beach. 103 pages.</ref> The shell is smooth, save for light growth lines and ill-defined spiral lines. It is brown or reddish fawn-colored, black around the [[Umbilicus (mollusc)|umbilicus]] and greenish inside.
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