Homalozoa is an extinct subphylum of Paleozoic echinoderms that lacked the typical pentamer body form. Instead all homalozoans were markedly asymmetric. Homalozoans are extremely variable in forms, but they all were sessile animals. The body (theca) was covered with calcite plates with a number of openings. Their form is in some cases so unusual t...
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http://en.wikipedia.org/wiki/Homalozoa
(informally carpoids) Extinct subphylum (Phylum Enchinodermata) whose members have no trace of radial symmetry. The theca is depressed and asymmetrical. Homalozoa are known from Middle Cambrian to Middle Devonian rocks.
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http://www.fossilmall.com/Science/Glossary.htm
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