342 GENERAL SYSTEMATIC BACTERIOLOGY 



Zellen elliptisch, anfangs zu rundlichen Zellhaufen zusammengeballt, spater 

 hohle Sacke bildend, in welchen die Zellen einschichtig einer Schleimmasse einge- 

 bettet lagern; zuletzt zerreisst die Haut stellenweise und bildet ein Netz. Zellin- 

 halt rothlich. Von der Spaltalgengattung Clathrocystis Henfrey nur durch den 

 Mangel des Phycochroms verschieden. 



One species is included, Lamprocystis roseo-persicina. Winogradsky 

 (1888, p. 71) described the genus in somewhat greater detail. He 

 states : 



Ihre Zellen sind nach der Theilung kugelig oder kaum merklich elliptisch, 

 mit einem Durchmesser von 2.1ju, vor der Theilung fast doppelt so lang. Die 

 Farbung ist nur in der Masse ziemlich intensiv violett. Die sehr kleinen, punkt 

 formigen Schwefelkornchen verleihen der Zoogloea einen braiinlichen Ton. Die 

 Intensitat der S Einlagerung und Oxydation ist viel geringer als bei Thiocystis. 



De Toni and Trevisan (1889, p. 1038) give the following diagnosis: 



Cocci globosi vel subelliptici, numerosissimi, in muco matricali nidulantes, 

 in familias globosas magnas inordinate cumulati. Glebae singulae cystidibus 

 universalibus gelatinosis involutae, initio globoso-ovideae, nitus solidae, 

 dein cavo-saccatae, aetate provecta figuratae, irregulariter clathratae, demum 

 in parvos cumulos libere natantes solutae. Cystides speciales nuUae. Cocco- 

 rum divisio mitio glebarum in tres directiones, dein in duas. Sporae ignotae. 



The generic description most frequently used is that of Migula 

 (1900, p. 1043): "Familien anfangs solid, darvor hohlkugelig, netz 

 formig durchbrochen, endlich in kleine, schwarmfahige Gruppen sich 

 auflosend," He includes the genus in the Rhodohacteriaceae. This 

 description has been used by Smith (1905, p. 163) and Frost (1911, p. 

 61). The generic name is also used by Orla-Jensen (1909, p. 334) 

 for the eighth genus of the family Rhodohacteriaceae of the order Cepha- 

 lotrichinae. 



Buchanan (1918, p. 467) gave the following generic description: 



Cells ellipsoidal, dividing at first in three planes to form spherical cell masses, 

 later in two planes, forming hollow sacks in which the cells lie embedded in a layer 

 in the walls, finally the membrane ruptures, and the whole mass becomes net like, 

 much as in the algal genus Clathrocystis. Usually colored intensely violet. Small 

 sulphur granules present. Capable of swarming. 



The type species is Lamprocystis roseo-persicina (Cohn) Schroeter. 



Bergey et al. (1923, p. 387) follow Buchanan, including this genus in 

 the tribe Lamprocysteae. 



Lampropedia. A genus of cocci proposed by Schroeter (1886, p. 

 151) with the following diagnosis: 



