612 THE AMERICAN NATURALIST. 
at La Ternera, Chili. Ten species of gymnosperms and ferns are 
enumerated, and they serve to indicate that the beds belong to the 
Lower Lias. D.P.P 
PALEONTOLOGY. 
Notes on Fossil Fishes. — In the Buletin of the Geological Society 
of America Mr. C. R. Eastman has an account of the fossil fishes 
of Jurassic formations in the Black Hills of South Dakota. The 
paper is supplementary to one by. N. H. Darton on the same subject. 
The Jura-Trias of America has yielded very few fishes, and the 
scanty remains noted by Mr. Darton and Mr. Eastman represent 
about all that is known of the fish fauna of the period as represented 
in American deposits. In the present paper are given descriptions 
and photographic representations of Pholidophorus americanus and 
Amiopsis (2?) dartons. The relations of Pholidophorus are discussed 
in some detail, it being regarded as the type of a distinct family, 
Pholitioplioride: 
In the Memoirs of the New York Academy of Sciences Dr. Bashford 
Dean discusses the relationships of the alleged fossil lamprey of the 
Devonian, Paleospondylus gunni. In Dr. Dean's view this species 
is not a lamprey, nor related to the cyclostomes. It is probably a 
larval form, possibly of the Arthrodira genus Coccosteus. The 
Arthrodira, according to Dr. Dean, “cannot be strictly included 
among the fishes,” and with their relatives (Anarthrodira), all also 
extinct, should be placed in a distinct class, Arthrognathi, by them- 
selves. 
In the Journal of Geology Mr. C. R. Eastman describes and figures 
the teeth of a number of Devonian fishes, the following being de- 
scribed as new: Cladodus monroet, from the Hamilton formation at 
Milwaukee; Dipterus uddeni and D. calvini, from the Middle Devo- 
nian, New Buffalo, Iowa; D. costatus and D. mordax, from North 
Liberty, Iowa. D: 8. E 
A slab of limestone with numerous specimens of Uintacrinus 
socialis Grinnell, recently placed on exhibition in the Yale Univer- 
sity Museum, is noticed and figured in the April number of the 
American Journal of Science. A similar and somewhat larger slab in 
the Museum of Comparative Zoólogy is figured in the Annual Bep 
of the Museum for 1898-99. 
