DESCRIFHON OF SPECIES. 



565 



On agar a greyish growth ex- 

 tends over the surface, and later 

 prominent yellowish heaps make 

 their appearance. 



On potato there is an abundant 

 growth of a golden-yellow colour. 



They were found in sewage 

 mud. 



Spirillum cholerae Asiaticse 

 (p. 301). 



Spirillum choleroides (Buj wid). 

 Curved rods very similar mor- 

 phologically and in cultures to 

 Koch's comma-bacilli. 



They were isolated from river 

 water. 



Spirillum choleroides (Orlow- 

 sld). Curved rods very similar to 

 Koch's comma-bacilli. 



They were found in well water. 



Spirillum concentricum 

 (Kitasato). Short spirilla, and 

 spirilliform filaments. 



Colonies are circular, and com- 

 posed of concentric rings alternately 

 opaque and transparent. 



Inoculated in the depth of gela- 

 tine there is only a little growth 

 in the track of the needle, and a 

 cloudy growth on the surface 

 extending into the jelly. 



On agar the growth is extremely 

 adherent. 



In broth they produce turbidity, 

 which disappears after a time ; and 

 there is a slimy deposit at the 

 bottom of the tube. 



They were found in putrefying 

 blood. 



Spirillum dentium (Miller). 

 Spirals 10 to 20 p, in length, pointed 

 at the ends. 



They have not been cultivated. 



They occur in the deposit on the 

 teeth, and in company with Lepto- 

 thrix buccalis in carious teeth. 



Spirillum flavescens (Weibel). 

 Commas thicker than those found 

 in Asiatic cholera, spirilla, and 

 spirilliform filaments. 



Colonies yellowish. 



Inoculated in the depth of gela- 

 tine a finely granular filament 

 develops in the track of the needle, 

 and on the free surface a pale- 

 yellow patch. 



On agar the growth, at first 



greyish- white, becomes yellow, and 

 forms a thick layer. 



On potato the growth is abun- 

 dant, and similar in colour. 



They were found in sewage 

 mud. 



Spirillum flavum (Weibel). 

 Spirilla morphologically identical 

 with spirillum aureum. 



Colonies on gelatine are pale- 

 yellow, and later the colour is more 

 intense. 



On agar and potato they form a 

 layer the colour of yellow-ochre. 



They were isolated from sewage 

 mud. 



Spirillum leucomelaneum 

 (Koch). Dark and glass-like spaces 

 alternate in the spirillum, resulting 

 from a regular arrangement of the 

 dark granular contents. A rare 

 form observed in water covering 

 rotting algaB. 



Spirillum linguae (Weibel). 

 Curved rods, spirilla, and spirilli- 

 form filaments, and involution 

 forms. 



Colonies are composed of inter- 

 lacing filaments, and offshoots 

 extend into the surrounding gela- 

 tine. 



Inoculated in the depth of gela- 

 tine a delicate growth occurs in the 

 needle track. 



On agar the growth is whitish 

 and granular. 



In broth a cloudiness is produced, 

 as well as a flocculent deposit. 



They are especially distinguished 

 from other spirilla described by 

 Weibel by their staining by Gram's 

 method. 



They were isolated from the 

 tongue. 



Spirillum marinum (Russell). 

 Curved rods, and spiral filaments. 



Colonies circular, granular and 

 striated ; later, flocculent masses 

 float in liquefied areas. 



Inoculated in the depth of gela- 

 tine liquefaction occurs in the 

 track of the needle, and a mem- 

 brane forms on the surface of the 

 cloudy liquid. 



On agar the growth is yellowish 

 and abundant. 



On potato a thick, waxy mass 



