Orthoceras (`straight horn`) is a genus of extinct nautiloid cephalopod. This genus is sometimes called Orthoceratites. Note it is sometimes misspelled as Orthocera, Orthocerus or Orthoceros {Harvcol|Sweet|1964|p=K222}. Orthoceras fossils are common and have a global distribution, occurring in any marine rock, especially in limestone. These are .....
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http://en.wikipedia.org/wiki/Orthoceras
• (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.
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http://thinkexist.com/dictionary/meaning/orthoceras/
(from the article `cephalopod`) ...shell. With elongation of the shell and the formation of septa or partitions, the nautiloid shell could be formed (Late Cambrian, 523 to 505 ...
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http://www.britannica.com/eb/a-z/o/33
(pronounced ORTH-oh-SEER-us) Orthoceras meaning straight horn) were primtive types of nautiloids that looked like squid with a long, straight (or slightly curved), conical, chambered, and furrowed shell. The shell ranged from a few centimeters to over 9 feet long. The Orthoceras lived in the largest chamber in the shell. These invertebrates swam in...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Or·thoc'e·ras noun [ New Latin , from Greek
'orqo`s straight + ... a horn.]
(Paleon.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.
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http://www.encyclo.co.uk/webster/O/34
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