Bacillaria.] THE INFUSORIA. 193 



(b). Bodies placed concentrically around one or two central 

 cells (*), circle simple. 



191. MICRASTERIAS coronula. The Jive-fold Micras- 

 terias has quarternary bodies placed around a fifth, and 

 having the margins variously excised ; rare ; found with 

 oscillatoria, &c. Diameter of star 1 -860th to 1-5 70th. 



192. MICRASTERIAS Napoleonis. Napoleon's Micras- 

 terias has six bodies, placed in a single series around two, 

 and having their external edges variously notched (excised) 

 or horned. This animalcule receives its name from Turpin, 

 on account of its similarity of appearance to the star of 

 the French legion of honour. This description agrees 

 with T. 1 1 , f. 3, from which I am induced to think there 

 is some mistake in Ehrenberg's plate. Figures 117 and 

 118 represent two varieties. Size 1-1 150th to 1-5 70th. 



193. MICRASTERIAS heptactis. The seven-ray ed Micras - 

 terias (shewn at ^.114) has seven bodies, placed in a 

 simple series, with one or two in the middle. The 

 margin is variously excised. The middle body is either 

 round, or four or six-cornered ; in the larger star-like 

 clusters it is double. Size 1-1 150th to l-5?0th. 



(**) Circle double. 



194. MICRASTERIAS Boryana. Bory's Micrasterias has 

 ten bodies in the external series, five in the internal, and 

 one in the centre, as shewn in fig. 115 and 116. Each 

 marginal body has an indentation, so that the star-like 

 cluster appears like a toothed wheel ; the teeth are short 

 or long, but never truncated. In some specimens the 



o 



