388 The American Geologist. June, 1393 
facies of the rock. Apatite occurs sparsely in short, stout prisms, 
and sphene is uncommon. 
The writer expects to present soon an account of the geology of 
the region about Kekequabic lake, in which this interesting gran- 
ite will be treated more in detail. There is reason to think that 
soda-granites will be found more extensivel}' developed in the lake 
Superior region than has heretofore been supposed. It seems 
that some of the augite syenites of the Keweenawan, as already 
suggested,* may fall into this class, and there are numerous dj'kes 
in the Keewatin of northeastern Minnesota, described as quartz- 
porph^Ties and sj-enite porphyries, t a careful studj- of which will 
probabl}' show that their feldspar is largely anorthoclase. 
Thanks are due to Prof. G. H. Williams for kind suggestions 
and aid in the stud}^ of this granite; and to Prof. J. A. Dodge and 
C. F. Sidener of the University of Minnesota by whom the analy- 
ses were made. 
Petrograpliical Laboratory^ Johns Hopkins University. 
BIBLIOGRAPHY OF NORTH AMERICAN VERTE- 
BRATE PAL/EONTOLOGY FOR THE 
YEAR 1892. 
By John Eyerman, F. G. S. A., Easton, Pa. 
1. Baur, G. — On the Morphology of the skull in the Mosasauridaj. 
Jour. Morph., vii, pp. 1-22, III. 
2. Gary, Austin. — A Study in Foot Structure. Jour. Morph., vii, pp. 
305-316, 111. 
Gase, E. G.— See No. 64. 
3. Glaypole, E. •'W. — A New Gigantic Placoderm from Ohio. 
Am. Gool., X, July, pp. 1-3, 111. 
Gen. et sp. nov. Oorgonwhthys clarkl. 
Glaypole, E. W.— On PahTaspis of Glaypole. Eev. in Ann. Mag. 
Nat. Hist., Oct., p. 334. 
4. Olaypole, E. W. — On the Structure of the American Pteraspidian, 
Pateaspis (Glaypole); with Remarks on the Family. Quart. Jour. 
Geol. Soc., xlviii, pp. 542-563, 111. 
5. Glaypole, E. W. — Some new Fossil Fish from the Cleveland shale. 
Title, Bull. Geol. Soc. Am., vol. iii, 1892, p. 500. 
6. Olaypole, B. "W.— The Head of Dinichthys. 
Am. Geol., x, Oct., pp. 199-206, 111. 
*W. S. Bayley, loc. cit. 
fU. S. Grant, Geol. and Nat. Hist. Survey of Minn., 20th (1891) Ann. 
Rep., pp. 45, 48, 49, 51, 57, 58. 
