Authors' Catalogue. 263 
having been described in an article in the same transactions of the pre- 
ceding year. 
In connection with the fauna of A. stenotoides several mutations of 
Agnostiis pisifotvnis receive attention, and an interesting account is 
given of the parallel development of two generic forms (or what are 
thought to be such) from a common root-stock is shown by description 
and diagrammatic representation. Two plates of figures accompanv 
the article. 
MONTHLY AUTHORS' CATALOGUE 
OF American Geological Literature, 
Arranged Alphabetically.* 
Bain, H. F. 
The Western Interior coal field. (Trans. Inst, of Mining En- 
gineers, vol. 16, 26 pp., pi. 6, 1899. Read before the North of England 
Inst, of Mining and Mechanical Eng., Dec. 10, 1898.) 
Bain, H. F. 
Notes on the drift of northwestern Iowa. (Am. Geol., vol. 23, pp. 
168-176, Mch. 1899.) 
Barlow, A. E. 
On the origin of some Archaean conglomerates. (Ottawa Natural- 
ist, vol. 12, pp. 205-217, pis. 6-9, Feb. 1899.) 
Bownocker, J. A. 
A deep pre-glacial channel in western Ohio and eastern Indiana. 
(Am. Geol.. vol. 23, pp. 178-182, pi. 6, Mch. 1899.) 
Brooks, A. H. (Wolff, J. E., and) 
The age of the Franklin white limestone of Sussex county, New 
Jersey. i8th Ann. Rept. U. S. Geol. Survey, pt. 2, pp. 425-457, pi. 83, 
1898.) 
Charron. A. T. (Shutt, F. T., and) 
The water of the Illecilliwaet glacier. (Ottawa Naturalist, vol. 12, 
pp. 226-228, Feb. 1899.) 
Daly, R. A. 
On the optical characters of the vertical zone of amphiboles and 
pyroxenes; and on a new method of determining the extinction angles 
of these minerals by means of cleavage pieces. (Proc. Am. Acad. 
.\rts and Sci., vol. 34, no. 12, pp. 309-323. pis. 1-3, Feb. 1899.) 
*Tliis li.st includes titles of articles received up to the 20th of the preceding 
month, including general geology, physiography, paleontology, petrology and 
mineralogy. 
