ORISMOLOGY. 277 



and form an angle like the outer bottom of a boat. 

 Ex. Notonecta glauca. 



2. CONVEX (Convexa). An elevation the arc of which 



is the segment of a circle. Ex. Upper Surface of 

 the body of most Coleoptera. 



3. GIBBOUS (Gibba). An elevation the arc of which 



is nof the segment of a circle*. Ex. Shoulders of 

 the elytra of Prionus coriarius, and of many other 

 Coleoptera. 



4s PLANE (Piano). Flat. When the disk is not higher 

 than the limb, nor the limb than the disk. 



5. CONCAVE (Concava}. A depression the arc of which 



is the segment of a circle. 



6. EXCAVATE (Excavata}. A depression the arc of 



which is not the segment of a circle. Ex. Protho- 

 rax of Sinodendrum cylindricum. 



iii. SCULPTURE. 



1. EQUATE b (JEqiiatd]. Without larger partial eleva- 



tions or depressions. 



2. SMOOTH (Lavis). Without smaller partial elevations 



or depressions. 



3.' LEVIGATE (Lccmgata\ Without any partial eleva- 

 tions or depressions. 



a This term in Anatomy denotes any unnatural protuberance or 

 convexity of the body, as a person hunched, or hump-backed. In 

 Astronomy it is used in reference to the enlightened parts of the 

 moon, whilst she is moving from the first quarter to the full, and 

 from the full to the last quarter ; for all that time the dark part ap- 

 pears horned or falcated, and the light one hunched out, convex or 

 gibbous. 



b We employ the term cequatus instead of tequalu commonly used 

 in this sense, because aqualis is also applied to magnitude, to which 

 we would restrict it. 



