mesotherIum

[Pref. me so-, and Greek therion a wild animal.] Palæont .: A genus of fo il rodents from South America. The lower jaw has four incisor teeth. The broad middle pair of teeth have an elongated ring of enamel around them, instead of having the edge worn away with a chisel-like form; and hence Mr. Alston has created for this one genus a section of the Rodent order, and called it He bet ident at a or Blunt-toothed Rodents. Mesotherium cristatum is found in the Pliocene of the Pampas of La Plata. *mě-soth-e-sis, s . [Gr. mesos = middle, and thesis a placing; tithemi =to place.] Middle, mean. ( Cole ridge .) měs-o-thō-răc-Ic, a. [MESOTHORAX.] Anat.: Pertaining or belonging to the mesothorax. měs-o-thör-ǎz, s . [Pref. me so- , and Eng. thorax .] Entom.: The middle ring of the three constituting the thorax. It is situated between the prothorax in front of it, and the metathorax behind it. měs-o-tro-chal, a. [Pref. me so-; Gr. trochos =a Zool.: Having the middle of the body banded around with cilia, as in the larvæ of certain species. ring.] 2689