200 The American Geologist. September, i904 
OSGOOD, W. H. 
Lake Clark. (Nat. Geog. Mag., vol. 15, p. 326. Aug., 1904.) 
PARKS, W. A. 
Remarkable parasite from the Devonian rocks of the Hudson bay 
slope. (Am. Jour. Sci., vol. 18, p. 135, Aug, 1904.) 
SCOTT, W. B. 
John Bell Hatcher. (Science, vol. 20, p. 139, July 29, 1904.) 
SELLARDS, E. H. 
Study of the structure of Paleozoic cockroaches, with descrip- 
tions of new forms from the Coal Measures. (Am. Jour. Sci., vol. 
18, p. 113, August, 1904.) 
SINCLAIR, W. J. (and E. L. FURLONG). 
Euceratherium, a new ungulate from the Quaternary caves of 
California. (Bull. Univ. Cal., vol. 3, pp. 411-418, 2 plates, June, 1904.) 
SMITH, E. A. (and H. McCALLEY). 
Index to the mineral resources of Alabama. Cleol. Sur. Alabama, 
map and illustrations, pp. 79, Montgomery, 1904. 
SPENCER, J. W. 
A lejoinder to Dr. Dall's criticism o?i Dr. Spencer's hypothesis 
concerning the late union of I<'lorida with Cuba. (Am. Geo!., vol. 
34, p. 110, Aug.. 1904.) 
TALLMON, M. C. (W. C. MORGAN and). 
A fossil ess from Arizona. (Bull. Univ. Cal., vol. 3, pp. 403-410, 
pis. 48-^9, June, 1904.) 
UPHAM, WARREN. 
Age of the Missouri river. (Am. Geo!., vol. 34, p. 80, Aug., 1904.) 
WATSON, THOS. L. 
Orbicular gabbro-diorite from Davis county. North Carolina. 
(Jour. Geol., vol. 13, pp. 294-304, May-June, 1904.) 
WeiDMANN, SAMUEL. 
The Baraboo iron-mining district. Bull. 13, Wis. Geol. Nat. Hist. 
Sur., 23 plates, pp. 199, map, Madison, 1904. 
WHITE, DAVID. 
Deposition of the Appalachian Pottsville. (Bull. G. S. A., vol. 15, 
pp. 267-282, plate, June, 1904.) 
WILDER, F. A. 
The Laramie and Fort Union beds in North Dakota. (Jour. Geol., 
vol. 13, pp. 290-294, May-June. 1904.) 
CORRESPONDENCE. 
TirE TYTE OF AvicuLiPECTEN. I was intcFCstcd to see Mr. G. H. 
Girty's note on "The typical Species and General characters of Avi- 
culipccfcn. McCoy. I have recently had occasion to examine this 
question wlicn working on the Pectiniform shells of the British Car- 
boniferous rocks and published certain results in Pt. II, Vol. II, of my 
