zygosaurus

[Pref. zygo-, and Gr. saura = Palæont.: A genus of Labyrinthodont i a. Skull irregular, with concave sides, an obtuse snout, and a concave occipital border; it is lofty in the occipital region, while falling gradually in front and rapidly on the sides. Orbits slightly posterior, large, irregular. Premaxillary teeth two or more on each side, larger than the maxillary teeth, which are sixteen or eighteen on each side; all are conical, strong, and nearly straight, with about twenty grooves at the base. Known species one, Zygo saurus lucius, from the Zechstein (Middle Permian), of the Government of Perm in Ru ia. ( Brit. A oc. Rep . (1874), pp. 163, 164.) zy-go-sěl-mi-dæ, s. pl. [Mod. Lat. zygoselm (is); Lat. fem. pl. adj. suff. -idœ.] Zoology: A family of Infusoria, or Flagella tae us to mat a, with six genera, mostly from freshwater. Animalcules solitary, free-swimming, or repent; flagella two, vibratile, similar; endoplasm sometimes green; oral aperture distinct, terminal; pigment-spots frequently present. zy-go-sěl-mis, s. [Pref. zygo-, and Gr. selmis an angler's noose made of hair.) Zool.: The typical genus of Zygoselmide (q. v.). Animalcules variable, from fresh-water; two flagella, at the base of which is the oral aperture, with a distinct tubular pharynx. One or perhaps two species.