14 Synopsis of the Bacteria and Yeast Fungi. 



D. — Doubtful Species. 



19. M. griseus (Warming). 



Bacterium griseum, Warming ("Om nogle ved 

 Danmarks Kyster levende Bakterier," p. 29 of 

 the Resum^). 

 ^ I Cells almost round or ovate, colourless, 2-5-4 



^ g@ /u. long (in the act of division, 6-7 \t, long), i '8- 

 § ^ 2-5 /x thick. (Fig. 6.) 

 „ a In infusions of fresh and sea water. 



© @ Since, according to Warming, this form occurs only in 



Fig. 6.— Mi- .^ motionless state (and then forming no zoogloea), and 



crococcus gjj^^g jj^g cell-form answers better to that of the genus 



eeo'^Tafter Micrococcus than to that of Bacterium, I have placed 



Warming), it in the former. 



20. M. ovatus (Lebert). 



Panhistophyton ovatum, Lebert. 

 Nosema bombycis, Nageli. 

 Cells oval, about twice as long as broad, rounded 

 at both ends, about 4-5, rarely 6 /x long, 2-3 (usually 

 2 'S ju. broad) ; isolated or united in pairs or little heaps. 

 (Fig. 4f.) 



In various organs of silkworms, their pupae, and imagos. 



It is questionable whether the described cells belong to a Schizomycete. 

 They were first discovered by Cornalia at Milan, and named corpuscules 

 ("corposcoli") ; according to him they are found also, although sparingly 

 and more by chance, in the blood of healthy silkworms. Afterwards, 

 these corpuscules ("corpuscules de Cornalia ") were recognised as the 

 cause of an epidemic disease of silkworms, called "gattine," or 

 "p^brine." 



Since the cells in their form and motionlessness agree very well with 

 Micrococcus, I have ranged them here. 



