ctenid1an

& s. [Eng., ., ctenoid; i connective, and suff. -an.] Ichthyology and Paleontology: A. As adj .: Pertaining to any fish of the order Ctenoidei or to that order itself; a fish with ctenoid scales. B. As substantive: 1. Sing . A fish covered with toothed or pecti nated scales. 2. Pl .: The order Ctenoidei (q. v.). "The Ctenoid i ans first appear in the Cretaceous formation."-Mantell: Fo ils of the British Museum , p. 440. ctěn-o-měs, s. [Gr. kteis , gen it. ktenos a comb, and mys=a mouse.] 1. Zool .: A genus of rodent animals, family Octodontidae. The toes are five on all the feet, the innermost one much shorter than the others. The best known species is Ctenomys magellanicus . The body but which may be a section of the Dipnoi. The is brownish-gray, tinged with yellow; its length, 7 dorsal fins are two, the scales cycloidal, the pectorals and ventrals acutely lobate, the dentition ctenodont. It contains the genus Dipterus, and perhaps Ceratodus and Tristich opter us. Dr. Günther considers the first two genera closely akin, but Dr. Traquair would place Tristich opter us with the cycliferous division of the Glyptodipterini. Cera tod us has also been found to be closely allied to inches without the tail; the latter 24 inches. The animal is found on the shores of the Straits of Magellan, on the plains north of the Rio Colorado, ., where it lives in burrows. 2. Palæont.: Mr. Darwin found a species of Ctenomys in a cliff of red earth of Pliocene age at Bahia Blanca, in the Argentine Confederation, on the east coast of South America. cub an