THE GENUS ALBOCOCCUS 205 



been in the genus DiplococcuSj before Alb. candidus and 

 Alb. tetragenus can be satisfactorily separated. 



A large number of names of white, non-liquefying, para- 

 sitic cocci appear to be synonyms of one or other of these 

 two types; but whether a given description should be 

 referred to Alb. candidus or Alb. tetragenus is difficult to 

 say, since the descriptions are so generally incomplete 

 in essential points. The following list includes those 

 names which appear to the authors to belong to one or 

 the other of these types: M. albocereus, Migula; M. 

 as per, Migula; M. canus, Migula; Staph, cereus albus, Pas- 

 set; M. coryzce (Hajek), Migula; M . fervidosus (Adametz), 

 Migula; M. gelatino genus , Brautigam; M. gummosus, 

 Happ; M. nubilus, Migula; M. ovalis, Escherich; M. 

 pollens, Henrici; Str. proteus, Chester; M. rugatus (Weich- 

 selbaum), Migula; M. salivarius (Biondi), Migula; 

 M. serratus, Migula; M. similis, Dyar; M. tardissimus 

 (Fliigge), Migula; M. tenuis (Rosenbach), Migula; M. 

 tenuissimus (v. Besser), Migula; M. trachomatis, Migula; 

 M. viticulosus, Fltigge. These forms differ among them- 

 selves in abundance of growth and in other minor char- 

 acteristics. They are alike in the white color of their 

 growth masses and in their failure to liquefy gelatin. 

 They differ from the paler varieties of the genus Micro- 

 coccus (to be described in the next chapter) by one or 

 more of the three characteristics of the Paracoccaceae, — 

 parasitic origin, positive Gram reaction, and acid pro- 

 duction. 



