NON-PATHOGENIC MICROCOCCI. 611 



216. STREPTOCOCCUS VERMIFORMIS. 



Synonym. Wurmformiger Streptococcus (Maschek). 



Found in Freiburg water by Tils. 



Morphology. Streptococci, which show slow, vermiform, progressive 

 movements ; the juxtaposition of sevei'al cocci in a chain gives the appearance 

 of bacilli, which are again united in chains (Tils). 



Biological Characters. An aerobic, liquefying streptococcus. Grows 

 in the usual culture media at the room temperature. Upon gelatin plates 

 forms yellowish-white colonies, which sink into the gelatin as liquefaction 

 occurs; about the more transparent interior a darker liquefied ring is seen, 

 which is bounded by a white border ; under a low power the interior is seen 

 to be finely granular and pale-brown in color ; the margin has a radiate ap- 

 pearance. In gelatin stick cultures growth occurs upon the surface and 

 along the line of puncture, causing rapid liquefaction of the gelatin; a dirty- 

 yellow deposit accumulates at the Dottom of the tube. Upon potato a dirty- 

 yellow layer is slowly developed ; later this becomes somewhat darker. 



217. STREPTOCOCCUS REVis (Von Lingelsheim). 



Obtained from normal human saliva, and differentiated from Streptococ- 

 cus pyogenes by Von Lingelsheim (1891). 



Morphology. Micrococci, solitary, in pairs, or in short chains seldom 

 as many as eight to ten elements. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying streptococcus. Grows in the usual culture media at the room 

 temperature more rapidly than Streptococcus pyogenes. Bouillon is uni- 

 formly clouded by the growth of this streptococcus, while the streptococci 

 which form long chains leave the bouillon transparent and form conglo- 

 merate masses. In blood serum of the ox the growth of this streptococcus 

 exactly resembles that of Streptococcus pyogenes, long chains being formed 

 which are associated in conglomerate masses. Upon gelatin plates, at the 

 end of twenty -four hours, forms punctiform colonies, which under the mi- 

 croscope are usually seen to be spherical in form with an even contour. 

 Upon the surface ofagar a thin, homogeneous, yellowish-gray layer is de- 

 veloped along the impf strich not composed of separate colonies ; along the 

 line of puncture in nutrient agar the colonies are largest below and are fre- 

 quently flattened or irregular in c orm. In gelatin stick cultures the devel- 

 opment at first resembles that of "Streptococcus longus " (Streptococcus 

 pyogenes) , but after three days a funnel-like cavity forms near the surface 

 of the gelatin, which finally extends downward for a distance of four to five 

 millimetres, while below this, usually separated by a space in which there is 

 no evidence of growth, colonies the size of a pin's head are developed along 

 the line of puncture in rows. Upon, potato, at 37 C., an abundant develop- 

 ment occurs within forty-eight hours, in the form of a confluent, white 

 layer, easily stripped from the surface. 



STREPTOCOCCUS CADAVERIS (Sternberg). 



Possibly identical with Streptococcus brevis, described above. Found 

 by the writer in the liver of a yellow-fever cadaver. 



Morphology. Micrococci, in pairs, or in short chains which are usually 

 made up of cocci in pairs, or oval elements which show, more or less dis- 

 tinctly, commencing binary division; diameter about 0.5 //. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying streptococcus. Grows in the usual culture media at the room 

 temperature. Grows readily in a decidedly acid medium. In. gelatin stick 

 cultures opaque, spherical colonies are formed along the line of puncture 

 larger and more opaque than in similar cultures of Streptococcus pyogenes 



