Chambers's encyclopædia; a dictionary of universal knowledge . Quedlinburg, 1831).—Not to be confoundedwith the foregoing is the historian Hesychitjs ofMiletus, eurnamed the Illustrious, who flourishedin the beginning of the 6th c, and was the authorof the following works : 1. A book on eminentteachers {Peri ton en Paidela lampsaJiton Sopkon) ;2. Another on the city of Constantinople {Peri tonPatriun Konslantinoupoleos); and 3. A Chronicle orhistory {Bihlion Historikon, &c.), commencing withthe earliest times, and coming down to the deathof Anastasius. It is now lost. See Orellius, He
Chambers's encyclopædia; a dictionary of universal knowledge . Quedlinburg, 1831).—Not to be confoundedwith the foregoing is the historian Hesychitjs ofMiletus, eurnamed the Illustrious, who flourishedin the beginning of the 6th c, and was the authorof the following works : 1. A book on eminentteachers {Peri ton en Paidela lampsaJiton Sopkon) ;2. Another on the city of Constantinople {Peri tonPatriun Konslantinoupoleos); and 3. A Chronicle orhistory {Bihlion Historikon, &c.), commencing withthe earliest times, and coming down to the deathof Anastasius. It is now lost. See Orellius, HesychiiOpera (Leip. 1820). HETEROCERCAL (Gr. heteros, different,unequal, and Icerkos, a tail), a term introduced byAgassiz to designate a peculiarity of structure inthe tail of some fishes, in which the tail is unsym-metrical with reference to the body of the fisli orthe vertebral column; the vertebral column beingfirolonged into the upper of the two lobes of thetail, and a second lobe, more or less distinct,appearing on the under side. The heterocercal. Heterocercal Tail (Sturgeon). tail is, among recent fishes, characteristic of theCartilaginous Fishes, and is, therefore, a much lessjirevalent form than the symmetrical or homocercal(Gr. /io;?, equal) tail. It is very generally regardedas indicating an affinity to Saurian reptiles. Bvitin the older geologic formations, the heterocercalis the prevalent form; in all the formations olderthan the oolitic it exclusively appears. HETEROGANGLIATA (Gr. heteros, diverse,and ganrjUon, a ganglion), a term introduced by Owen,and adopted by many zoologists, in accordance witha scheme of zoological classification founded on thenervous system in animals, to designate the Molluscaof Cuvier, with which are ranked the zooph3rtesof the di\dsion Polyzoa or Bryozoa. The uervouscentres or ganglia are not an-anged in a longitudinalseries of symmetrical pairs, but are variously dis-tributed in different parts of the body; one principalganglioni
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