plesiarctomes

[Prefix plesi-, and Mod. Lat. arctomys (q.v.).] Palæont .: An extinct genus of Sciuridæ, from the European Miocene, probably intermediate between the Marmots and the squirrels. ple-si-o-, pre-si-, pref. [Gr. plēsios near, close to.] Nat. Science: Resembling, having affinities with. plē-si-o-çe-tus, s. [Pref. plesio- , and Lat. cet us ; Gr. kētos a sea-monster, a whale.] Palcont.: A genus of Cetacea. Three known British species from the Newer Pliocene. plē-si-o-mër-x, s. [Pref. plesio-, and Greek meryx a fish that was supposed to ruminate.] Paleontology : A genus of Artiodactyl a, from the phosphate of lime deposits of France, probably of Upper Eocene age. ple-si-o-morph-Ism, s. [Pref. plesio-, and Gr. morphe =form.] Crystall.: A term applied to crystallized substances, the forms of which closely resemble each other, but are not absolutely identical. ple-si-o-morph-ous, adj . [PLESIOMORPHISM.] colombi Closely resembling or nearly alike in form. ple-si-ô-pi-na, s. pl . [Mod. Latin plesiop (s); Lat. neut. pl. adj. suff. -ina.] Ichthy.: A group of Nandide (q. v.). They are small marine fishes, with pseudobranchise and only four ventral rays. The group contains two genera, Plesiops and Trachinops. plē-si-õps, s. [Pref. plesi-, and Gr. ops =the eye, the face.] Ichthy.: A genus of Plesiopina, from the coral reefs of the Indio-Pacific. plē-si-o-sâur, s. [PLESIOSAUR US.] Any individual of the genus Plesiosaur us. ( Owen: Palæont., p. 252.) plē-si-o-sâu-ri-a, s . pl . [PLESIOSAUR US.] Palæont.: A group or order of fo il Reptilia, of which Plesiosaur us (q. v.) is the type. The order is represented in European Tria ic beds by Not hos a urus, Simosaurus, Placodus, and Pistosaurus; and in the North American Chalk by Cimoliasaurus, Elasmosaur us, Oligosimus, Piratosaurus, and Poly cotylus-all closely allied to the type-genus. "The remarkable extinct marine reptiles included in the group of the Plesiosaur i a (or Sauropterygia, as they are sometimes called) existed during the whole of the Mesozoic period, that is, from Tria ic into Cretaceous times, when they appear to have died out."-Encyc. Brit , (ed. 9th), xix. 220. plethysmograph ple-si-o-sâu-roid, adj . [Mod. Latin plesio saur( us ); Eng. suff. -oid .] Belonging to or characteristic of the genus Plesiosaur us (q. v.). ( Owen : Paleont ., p. 249.)