THE EXAMINATION OF PLATE CULTURES 37 
5. Edges of colonies. 
Entire; without toothing or division. 
Undulate: wavy. 
Repand ; like the border of an open umbrella. 
Erose: as if gnawed, irregularly toothed. 
Lobate. 
Lobulate : minutely lobate. 
Auriculate; with earlike lobes. 
Lacerate: irregularly cleft,,as if torn. 
Fimbriate: fringed. 
Ciliate: hairlike extensions, radiately placed. 
Tufted. 
Filamentous : as already defined. 
Curled; as already defined. 
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Fic. 5. Structure of colonies: 1, conglomerate colony; z, toruloid 
colony; 3, alveolate structure; 4, grumose in center; 5, moru- 
loid; 6, clouded; 7, reticulate; 3, marmorated; 9, gyrose. 
6. Optical characters (after Shuttleworth). 
Transparent: transmitting light. 
Vitreous ; transparent and colorless. 
Oleaginous: transparent and yellow; olive to linseed oil 
colored. 
Resinous ; transparent and brown, varnish or resin colored. 
Translucent: faintly transparent. 
Porcelaneous: translucent and white. 
Opalescent : translucent, grayish white by reflected light, 
smoky brown by transmitted light. 
