256 The American Geologist. ^p"'' i^^^- 
usually somewhat larger than a single county, bounded by geographic- 
al meridians and parallels. The reports present, not the details of 
structural observation, but generalized descriptions, with references to 
publications where more detail can be found. In important regions, such 
as involve large economic interests, numerous columnar sections of the 
strata are given ; the areas arc described from every geologic point 
of view. 
'J'he prices of these folios, and of all otlirr publications of the sur- 
vey can be ascertained by addressing an inquiry to the Director of 
the survey at Washington. N. h. w. 
Ri'purt on the Geology of Louisiana, containing special papers by differ- 
ent authors; based on the zi'ork of three field seasons, 1900, 1901 
1902. Gilbert D. Harris, Arthur C. Veatch and Jov. A. A. Pache- 
co. Baton Rouge, 1902, made under the direction of the state experi- 
ment sta'tion, William C Stubbs, director. Pp. 288, 10 plates. 
The managers of the Louisiana state experiment station have 
shown wisdom not only in the initiation of this survey but in the 
selection of geologists to make it. It is. so far as known to the writer, 
the first and only instance in which the necessary alliance between 
geology and agriculture has been recognized by the use of the funds 
of the "experiment station" of the state in an examination of the geo- 
logical structure. It is to be hoped that the good showing that is 
made by Dr. Harris and his assistants will induce the state legis- 
lature to make financial provision for a continuance and extension of 
this survey. Previous to this report a short "preliminary report" by 
W. W. Clendenin has appeared, under the same auspices (1896), and 
Dr. Otto Lerch began the "geological and agricultural survey" in 1892. 
It has been interrupted because of lack of funds. n. h. w. 
Notes on Cambrian Faunas, by G. F. Matthew, L.L.D., i^'itli descrip- 
tion of a nexv species of Mctoptoma. [Trans. Roy. Soc. Can., 2d 
Sen, Vol. VIII, Sec. IV, p. 93]- 
The principal "note" in this group of short papers is on the oboloid 
shells of the Cambrian system in Canada and is accompanied by a plate 
showing the several Oboli that have been found in this region. It is 
shown that there is a wide difference in the arrangement of the mus- 
cles that hold the valves together, and hence it is inferred that though 
similar to Obollus in form they are not closely related to the type 
of this genus. By a table of the Cambrian zones it is shown that all 
of these species except one are older than the typical Obolus apol/onis. 
The next note relates to the development in size of the inarticulate 
brachiopod of the basal Cambrian, showing that all the genera except 
Acrothyra increased the size of their valves during the progress of 
Cambrian time. 
The third note contains a suggestion that the Upper Etcheminian 
fauna (basal Cambrian) invaded eastern Canada from the southwest. 
The fourth note is a review of the brachiopods of the Cambrian 
fauna of Mt. Stephen, with the description of a new species of 
Metoptoma. 
