The Collaborative International Dictionary
Pentremites
Pentremites \Pen`tre*mi"tes\, n. [NL., from Gr. ? five + L. remus an oar.] (Zo["o]l.) A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.
Wiktionary
pentremites
n. (plural of pentremite English)
Wikipedia
Pentremites
Pentremites is an extinct genus of blastoid echinoderm belonging to the family Pentremitidae.