DESCRIPTION OF SPECIES. 



665 



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-j'ellow colour. 



They were found in sewage 

 mud. 



Spirillum cholerse Asiatics 

 (p. 361). 



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- 

 ski). — 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 /i 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 algae. 



Spirillum liugusB (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 mariuum (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 



