THE OSTRACIOH. 
*48 
number of tubercles of triangular fhape,and in fubflance is 
fornething of the nature, partly of flcin, and partly of » 
ihell. There are fome varieties of this fpecies *. Of the 
orbs, or globular fiih, Willoughby enumerates nolefs than 
thirty different fpecies ; concerning which, however, very 
little is known, but the name and the external figure - 
His orbs comprehend two or three different genera of the 
Syftema Natures, Linnaus having improved the arrange' 
ment given by preceding naturalifts. 
* Will. Ichthyol. p. 148, 
