Cyclo me top a (sik lome top a)

pl. [NL., last pair of thoracic legs. It contains such genera as Cancer, Carcinus, Portunus, Xantho, etc., and corre sponds to the more ore modern group Cantcoidand forte Blainville's system of cla ification the Cyclo me top a were characterized as having the carapace very large, arched in front, and narrowed behind; the legs moderately long: and the epistoma very short and transverse. It included the families Cancride, Portunidæ, and Pilumnidæ of Leach. It has also been called Cancroidea, and divided into the "legions" Cancrine a, Cyclinea, Corystoidea, and Thelphusinea. It includes the principal edible crabs of seas.