14 GENERA f, OKISMOLOGY. 



ATTENUATE (attenuatum), a cylinder having its transverse diameter 

 much narrower in one part. 



EQUAL (equate), a substance of variable longitude, but the transverse 

 diameters of which are equal. 



INCRASSATE (incrassatuni), much swollen at one portion of its length. 



CLUB-SHAPED (clavatum), a form which gradually increases in 

 thickness towards its apex, where it is obtuse. 



PEAR-SHAPED (pyrijbrme), a similar shape, but with this difference, 

 that its longitudinal section is spatulate. 



FUNNEL-SHAPED (infundibulifbrme), resembling the last in exterior 

 form, but scooped out at its apical margin. 



FORNICATE (fornicatum), concave within and convex without. 



KNOTTED (nodosum), a longitudinal body swollen at one or more parts. 



ANGULAR bodies are distinguished by the number of their sides, viz. 

 three sided (triquelrum), four sided (telragomim), &c. 



PRISMATIC (prismalicum), an angular body of indeterminate length 

 but equal thickness. 



PYRAMIDAL (pyramidale), a triangular body, the angles of which 

 all meet in one point. 



WEDGE-SHAPED (cuneaium), a body whose horizontal longitudinal 

 section is quadrate, and perpendicular transverse section triangular. 



20. 

 Differences of Margin. 



ENTIRE (integer), a plain, flat, straight, or bowed margin, without 

 angle or incision. 



ARCHED (arcuatu,?) a margin in the form of a bow. 



SINUATE (sinuatus), a margin with a rounded incision. 



WAVED (undulatus), a margin with a series of successive arched 

 incisions. 



SERRATE (serratus), with jagged incisions, like the teeth of a saw. 



CRENATE (crenalus), a margin with indentations, the exterior 

 whereof is rounded. 



DENTATE (dentatus), when the incisions are larger, causing the 

 margin to stand forth free and direct like teeth. 



CILIATE (cilialus), when it is occupied with short stiff hairs. 



LOBATE (lob at us), when the margin is divided by deep undulating 

 and successive incisions. 



EROSE (erosus), when from the irregularity of its incisions it appears 

 gnawed (the margins of the wings of many butterflies). 



