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CONTENTdm, along with all of OCLC's services, will be down approximately 15 hours for a system upgrade. This will occur from 9:00pm PST on Friday, January 2, to around noon on Saturday, January 3.


Productus giganteus. Carboniferous Limestone.
A, Interior of dorsal valve.
B, Interior of ventral valve.
C, Transverse section of valves.
D, Hinge line of A:
a, occlusor scars; d, divaricator scars; i, "reniform impressions"; ca, cardinal process; h, hinge line; p, brachial prominence; s, cavity for spiral arms; do, dorsal valve; ve, ventral valve

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