[HARRISON- ORGANISMS IN AESCULIN-BILESALT MEDIA 217 



vanderleck] 



Plate 4. 



236. Surface colony. White, round, black centre, margin entire, surface smooth, 

 light brown field. 

 Deep colony. Small, lenticular, black, black field. 



314, 300, 304. Surface colony. Light brown, round, margin entire, surface smooth, 



large black-brown field. 



Deep colony. Punctiform, black, faint black field. 

 338, 600. Surface colony. Large, round, colourless, black-brown centre. Colony 



surrounded by field of white crystals and round the latter field is a black field. 



Deep colony. Punctiform black, black field. 

 437. Surface colony. Round, watery, light brown, field black brown gradually 



diffusing in the agar medium. 



Deep colony. Lenticular, black, black field 



