118 
The Fossil Aulisci of California. 
By J. DEBY. 
It may be of interest to American microscopists to know that 
nearly one-third of all known species or forms of the Diatomace- 
ous genus Azliscus are to be found in the fossil deposits of Cali- 
fornia. The Santa Monica and San Redondo earths are the rich- 
est localities in the world for these beautiful little forms. I add 
from personal observations, a list of the California known forms. 
Auliscus antiquus, Ratt. 
A. Biddulphia, Kitt. 
Var. prominens, Ratt. 
A. celatus, Bail. 
Var. major. 
Var. constricta. 
A, compositus, A. Sm. 
A. decoratus, Ratt. 
Var. affinis, Ratt. 
A, elaboratus, Ralfs, 
A. elegans, Ratt. 
Var. Californica, A. Sm. . 
Var. Grunowi2, Ratt. 
. eximius, Ratt. 
. gractllimus, Ratt. 
By a 
. Hardmanianus, Grev. 
Var. futilés, Ratt. 
Var. difurcata, Ratt. 
. insignis, Cleve. 
. ntestinalts, A. 8. 
. Foynsonii, A. S. 
Macreanus, Grey. 
. mirabilis, Grev. 
. ovalis, W. Arnott, 
A, punctatus, Bail. 
A. pruinosus, Bail. 
A, sculptus, Ralfs. 
A, speciosus, A. Sm, 
A. Stockharatit, Jan.—A. racemosus, Ralfs. 
A, subreticulatus, Ratt. 
A, subspectosus, Ratt., 
=) oS ae 
besides a few undetermined and probably new forms seen by 
myself and by my friend, Dr. D. B. Ward, of Poughkeepsie, N. Y. 
