130 , III. DIST. CHAR. Prototype. 



their form ever being preserved in the fossil 

 state. 



of the oblong figure, forming the outline of the mouth, 

 rounded and equal. 



Quinquangular (quinquangulare) five-cornered; surrounded 

 by a margin with five prominent angles. 



Hexagonal (hexagonum) with six prominent angles. 



Madrepora retepora, T. 54. f. 3. Ellis. 

 &c. &c. 



Ringent (ringens) oblong with the upper margin rounded, and 

 the opposite extremity angular. Flustra. 



&.)Elongated (elongatum) the longitudinal diameter greatly exceed- 

 ing the transverse. Madrepora phrygia, T. 48. f. 2. Elli. 

 Short (breveyvilien applied to an oblong or oval aperture, im- 

 ports the longitudinal diameter not greatly to exceed the 

 transverse. Madrepora sinuosa, n. 35. Ellis. 



c.) Straight (rectum) Flexuose (fltxuosuni) &c. &c, v. Ambu- 

 lacra recta, &c. &c. 



<?.)Very large (maximum) Large (magnum) Middle sized (me- 

 dium) Small (parvum) Minute (minutum). There is no 

 part of the fulciment that can properly be used in a reference 

 to the comparative size of the aperture ; agreeable to the 

 usual mode of measuring the parts of bodies in natural histo- 

 ry. Hence, the terms just stated apply only to positive 

 magnitudes; as, very large, when not less than an inch in 

 diameter (note, when the diameter of the aperture differs 

 with the direction in which it is measured, the smallest extent 

 must be taken) Large, not an inch, nor less than half an 

 inch, in diameter Middle sized, not half an inch, nor less 

 than a quarter of an inch, in diameter Small, not a quarter 

 of an inch, nor less than a line, or the twelfth of an inch, in 

 diameter Minute, not a line, nor less than one fourth of a 



