Reviezv of Recent Geological Literature. 191 
the resemblance in structure between the shells of Hyolithes and the 
Brachiopoda. 
Holm speaks as follows of this genus and conularia. Between them 
are great differences. In Hyolithes the shell is solid rigid, evenly 
thickened, formed of at least three layers, and composed of calcium 
carbonate. Conularia is thin, flexible and composed of calcium phos- 
phate and a horny substance. In Hyolithes the shell is bilaterally sym- 
metrical, with dorsal and ventral sides plainly distinguishable. In 
Conularia the shell is quadrately or rhombically pyramidal, has two 
symmetrical planes [on each side] and has no distinct dorsal and ven- 
tral side. (Swedish Cambrian and Silurian Hyolithidae and Conulari- 
idas.) c. f. m. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
ARNOLD, RALPH. 
The Paleontology and Stratigraphy of the Marine Pliocene and 
Pleistocene of San Pedro, California. (Reprint from the Memoirs 
Cal. Acad. Sci., vol 3, pp. 420, pis. 37, 1903.) 
BROOKS, A. H. 
Preliminary Report of the Ketchikan Mining 1 District, Alaska, 
with an introductory sketch of the Geology of Southeastern Alaska. 
(U. S. G. S. Professional paper No. 1, pp. 120, pis. 2, figs. 6, 1902.) 
BUCKLEY, E. R. 
Highway Construction in Wisconsin. (Bull. No. 10, Economic 
Series No. 6, Wis. Geol. Survey, pp. 339, pis. 106.) 
CLARKE, J. M. (and R. RUEDEMANN.) 
Guelph Fauna in the State of New York. (New York State 
Mus., Memoir 5, pp. 195, pis. 20, 1903.) 
CLAYPOLE, E. W. 
The Devonian Era in the Ohio Basin. Part 1, con. (Am. Geol., 
vol. 32, No. 2, pp. 79-105, Aug., 1903.) 
COLLIER, ARTHUR J. 
A Reconnaissance of the Northwestern Portion of Seward Pen- 
insula, Alaska. (U. S. G. S. Professional paper No. 2, pp. 68, pis. 12, 
1902.) 
DALY, R. A. 
Mechanics of Igneous Intrusion. Second paper. (Am. Jour. Sci. 
vol. 16, no. 92, Aug., 1903, pp. 107-127.) 
DALY, R. A. 
Variolitic Pillow-Lava from Newfoundland. Am. Geol., vol. 32, 
No. 2, pp. 65-79, Aug., 1903.) 
