Models of the ammonoid from Mysterious Island and the Hydra from Jason and the Argonauts.    From Wordnik.com.  [Waste-o-time-Meme No. 839: The Objects Around Us] Reference

They show, in a large vertical / layered series of formations, how an ammonoid (a shelled creature similar to our chambered Nautilus of today) evolved over millions of years in the same region.    From Wordnik.com.  [Latest Articles] Reference

Given that the current estimate of the total number of species on the planet is about 2 million, this rate, by the end of the next century, will be equivalent in biological effect to the catastrophic event (s) of 65 million years ago that eliminated not only the dinosaurs but also the ammonoid cephalopods, many echinoids, and many genera of foraminifera and of calcareous phytoplankton, the kind of mass extinction that previously in the earth's history has required 5 million years for recovery, such recovery resulting in.    From Wordnik.com.  [Michael Smith - Banquet Speech] Reference

The magazine said the Chanel couture dress "makes her look like she's encrusted with ammonoid fossils.    From Wordnik.com.  [Life and style | guardian.co.uk] Reference

Mosasaur, crocodile, and ammonoid fossils (shells, teeth, vertebrae, bones etc.    From Wordnik.com.  [Latest Articles] Reference