Palæodictyoptera (pa leodiktioptera)

pl. [NL., characters of the Hemipter a and the Neuroptera, as is well shown in one of the genera, Eugereon. This was a gigantic form, having net-veined wings recalling those of Neurop that of the Hemipter a. higher group, and contains numerous genera. palæchinoid (pā-lē-kī'noid), a. and n. I. a. Of or pertaining to the te ellated sea-urchins or Palæchino idea. II. n. A member of the Palæchino idea . Palæchino idea (pālē-ki-noi'dē-a), n . pl . [NL., Palæchin us + -oidea .] An order or suborder of paleozoic sea-urchins having pluriserial interambulacral plates. See Tes sell at a . Palæchin us (pā-lē-ki'nus), n. [NL., erroneously for * Palæechinus , παλαιός , ancient, + ἐχῖνος , sea-urchin: see Echinus .] The typical genus of Palæchinidæ , founded by Scouler in 1840. P. sphæricus is a Carboniferous species. palæichthyan (pā-le-ik'thi-an), a . and n. [ læichthyes +-an.] I. a. Same as palæichthyic . II. n. A member of the Palæichthyes . Palæichthyes (pā-lē-ik'thi-ēz), n. pl. [NL., παλαιός , ancient, + ίχθύς , pl. ἐχθύες , fish.] In Günther's system of cla ification, one of four subcla es of fishes, composed of the Chon dropterygii and the Ganoidei , or the elasmobranchs and the ganoids. It is characterized by the presence of an optic chiasm and the development of a contractile conus arteriosus, with several pairs of valves to the heart. palæichthyic (pā-le-ik'thi-ik), a. [ [NL. (Fabric i us),