1900] A NEW CHROMOGENIC MICROCOCCUS 269 
form, with the colony on the surface and a thick, flocculent, rose- 
colored sediment. On agar, ‘‘rose”’ or “flesh colored.” 
(6) M. rosaceus (Frankland) is found in air. The entire 
description is as follows :** Cocci which are very variable in size, 
the largest 2.5 in diameter. On gelatine forms a smooth pink 
expansion on the surface, while needle track below remains 
almost undeveloped. In older cultures the margin assumes a 
tadiated appearance, while still older cultures frequently exhibit 
slight liquefaction. On agar, smooth bright pink surface expan- 
sion, devoid of any further character. Broth after nine days is 
clear, free from pellicle, and has a pink deposit. On plate, the 
colonies appear to the naked eye as pin-head dots on surface, 
and are bright pink in color. Under low power ( X 100) are seen 
to be of distinctly reddish tint, the edge irregular but smooth. 
As the colonies approach the surface, the irregularity diminishes. 
Certain points in this description agree somewhat with that 
of the Mississippi river form, 2. ¢., the gelatine culture and plate 
colonies, but the size of the coccus, the agar and broth culture 
seem to differ, and the description is too imperfect to make the 
eterison at all complete. The same may be said of Frank- 
land's description of his (7) M. carnicolor, the only stated points 
° difference from (6) being (a) amore rapid growth, (6) fainter 
fa of pigment, and (c) slightly different appearance of colo- 
the (more circular and brownish-pink). In both these forms 
ala cultures are said to be clear after nine days, while 
ci cultures of the salmon-pink form have remained cloudy 
una g  oneludes the list of red growing cocci which I wee 
; Scribed, except that mention might be made of Bumns 
ar oo oseus and Sarcina rosea (Schroeter), both Bei git 
will ap s : aa Sarcina mobilis (Maurea),” which pire © | 
already 2 “0p on potato, but has a brick-red pigment. I have 
nee ntioned J. agilis in the body of the description. 
— Roy. See. London 178 : 269. 1887. 
"STERNDERG . large . 
» Manual of Bacteriology 720. 1893. 
