324 The American Geologist. November, 1903. 
rypterus and Ptcrygotus and some remarkable crustacean remains of 
problematic position. 
10. Preliminary Observation on the Cobleskill (Coralline) Lime- 
stone of New York, by C. A. Hartnagel (p. 1109-1175) ; the first in- 
stallment of the results of detailed investigations undertaken by the 
author for the purpose of establishing the exact position and rela- 
tions of certain beds lying in eastern New York between the Lorrain 
shales and Lower Helderberg beds, which, like the "Coralline" limestone 
have hitherto been but broadly correlated with the standard series. 
11. Disturbed Fossiliferous Rocks in the vicinity of Rondout, N. Y., 
by G. van Ingen and P. Edwin Clark (p. 1176-1227). This contribution 
has, for its first object, a description of the series of Siluric and Lower 
Devonic beds of the Rondout region, and attempts further to unravel 
the very complex tectonic structure in which these rocks have been in- 
volved and which has been well exposed by the extensive cement min- 
ing. As the main structural features of the region are recognized a sig- 
moid flexure on the Vlightberg, which is an underfold toward the 
northwest, an overthrust of the upper layers of the crest of the arch; 
and an extensive overthrust of typical Appalachian characters in the 
hills adjoining north. 
12. The Torsion of the Lamellibranch shell, recently propounded by 
Noetling as an important criterion for phylogenetic investigation, is 
demonstrated in a paper by the State Paleontologist (p. 1228-1233, 2 dia- 
grams and 6 figures) to be also an important ontogenetic character in 
some forms, and it is by means of such ontogenetic observation con- 
cluded that the condition of the Protoconchae, or the most primitive 
group of Lamellibranchs, postulated by Noetling, is found in the pro- 
dissoconch. 
13. The same author (p. 1234-1238, 2 plates) describes two forms 
of Chsetopod worms, from the Upper Devonic beds of western New 
York, one of which, Protonympha salicifolia, is allied to Aphrodite, 
the other. Palseochseta devonica suggests Phyllodoce or Nereis. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
ALDEN, W. C. (M. L. FULLER and). 
Description of the Gaines Quadrangle. U. S. Geol. Atlas, Folio 
92, 1903. 
ALDEN. W. C. (M. L. FULLER and). 
Description of the Elkland and Tioga Quadrangles. U. S. Geol. At- 
las, Folio 93, 1903. 
AMI, H. M. 
Resources of the country between Quebec and Winnipeg along the 
line of the Grand Trunk Pacific railway. 
