274? ORISMOLOGY. 



14. ENSIFORM (Ensiformis). Whose horizontal sections 



are acute-angled triangles gradually diminishing 

 in diameter from the base to the apex, and propa- 

 gated in a straight line. PLATE XI. FIG. 7. 



15. ACINACIFORM (Acinaciformis). Whose horizontal 



sections are acute-angled triangles gradually in- 

 creasing in diameter from the base to the apex, and 

 propagated in a curved line. 



16. CULTUIFORM (Cidtriformis). Whose horizontal sec- 



tions are equal acute-angled triangles, or a three- 

 sided body with two equal sides large and the third 

 small. 



17. DELTOID (Deltoidea). Short with the horizontal 



section triangular and decreasing in diameter to- 

 wards the base. Ex. Apex of the posterior tibia 

 in Copris lunaris. 



18. TRIGONAL; TETRAGONAL; PENTAGONAL; HEXA- 



GONAL; POLYGONAL ( Trigona ,- Tetragona ; Pen- 

 tagona ; Hexagona ; Potygond). Whose horizon- 

 tal section is triangular; quadrangular; quinquan- 

 gular; sexangular; multiangular. 



19. TRIEDRAL; TETRAEDRAL; PENTAEDRAL; HEXA- 



EDRAL ; POLYEDRAL ( Triedra ; Tetraedra / Pen- 

 taedra j Hexaedra ; TPolyedra}. That hath three 

 sides ; four sides \Jive sides ; six sides ; many sides. 



20. PRISMOIDAL (Prismoidalis). Having more than 



four sides and whose horizontal section is a poly- 

 gon a . PLATE VI. FIG. 13. a, b, d'. 



a The word employed in Botany to denote a Polygon is prismati- 

 cal; but since, properly defined, this term is synonymous with trique- 

 trous, we thought it best to use an adjective derived from prismoid, 

 which implies a body that approaches to prismatical. 



