850 The American Naturalist. [September, 
whether it has in it the elements of permanency. It is novel to say the 
least to find numerous genera established on purely theoretical grounds 
with no known forms to put into them. In Dr. Fischer’s classification 
the bacteria are divided into two orders: The Haplobacteriacez, or 
single celled bacteria, and the Trichobacteriaces, or thread-form bac- 
teria (Cladothriz, etc.). The former multiply by slight elongation and 
cross-septation, the cells separating or remaininy attached in small num- 
bers. The latter consist of long cells, branched or unbranched, which 
finally break up into conidia or motile segments. The Haplobacteri- 
aceze consist of Coccaceze, Bacillacez, and Spirillaceze. The author’s 
classification of the more difficult group is as follows: 
FAMILY BAcCILLACE. 
Vegetative body one-celled, straight, with a distinct longitudinal 
axis, varying from short ellipsoidal to elongated rod ferm. Division 
always at right angles to the longitudinal axis; motile or non-motile; 
occuring singly or in chains; bearing endospores or arthrospores. 
1. Sus-Famiry BACILLEI. 
Non-motile, destitute of flagella. 
(a) With endospores. 
(1). Bacillus (Cohn). Spore-bearing rods cylindrical. 
(2). Paracloster (nov. gen.)* Spore-bearing rods fusiform. 
(3). Paraplectrum (nov. gen.)* | Spore-bearing rods clavate. 
(b. Without endospores, with arthrospores). 
(4). Arthrobacter (De Bary).* 
2, Sus-FaAMILY BACTRINEI. 
Motile, with a single polar flagellum. 
(1). Bactrinium (nov. gen.) Spore-bearing rods cylindrical. 
(2). Clostrinium (nov. gen.)* Spore-bearing rods fusiform. 
(3). Plectrinium (nov. gen.)*? Spore-bearing rods clavate. 
(4). Arthrobactrinium(nov, gen.)* With arthrospores. 
(5). Chromatium. Red sulphur bacteria. 
3. Sus-Faminy BACTRILLEI. 
Motile rods with a tuft of polar flagella. 
(1). Bactrillum (nov. gen.) Spore-bearing rods cylindrical. 
(2). Clostrillum (nov. gen.)* Spore-bearing rods fusiform. 
