69 
42G Scudder (Samuel H.). Notes upon myriapods and arachnids 
found in sigillarian stumps in the Nova Scotia coal field. 
Canada Geol. Surv., Cont. to Canadian Palaeontology, vol. ii, part i, 
pp. 57-65, pis. iv-v. 
Gives descriptions and figures of several species, including two new 
ones. 
427 Revision of the American fossil cockroaches, with description 
of new forms. 
U. S. Geol. Surv., Bull. No. 124, pp. 145, pis. xii. 
Gives faunal lists of American cockroaches and tables of distribution, 
and discusses the characteristics of Mylacrhhe. Describes and figures 
many species, including new species. 
428 Selwyn (Alfred R. 0.). Summary report of the operations of the 
Geological Survey for the year 1892. 
Canada Geol. Surv., Ann. Rept., 1892-93, new ser., vol. vi, Rept. A, 95 pp. 
Gives a summary of the reports of the geologists on the work done in 
British America in 1892. 
429 Summary report of the operations of the Geological Survey 
for the year 1893. 
Canada Geol. Surv., Ann. Rept., 1892-93, new ser., vol. vi, Rept. A, 98 pp. 
Gives a summary of the reports of the geologists of the work done in 
1893. 
430 Shaler (Nathaniel Southgate). Preliminary report on the geology 
of the common roads of the United States. 
U. S. Geol. Surv., 15th Ann. Rept., pp. 259-306. 
Gives a historical outline of American roads, describes methods of 
using stone in road building, the relative value of road stones, their dis- 
tribution, the action of rain, frost, and wind, the effect of geologic 
structure on grades of roads, and the sources of supply of road stone 
in New England, Appalachian region, Atlantic Coastal Plain, Mississippi 
Valley, Great Lakes region, and Cordilleran region. 
431 The geology of the road-building stones of Massachusetts, 
with some consideration of similar materials from other 
parts of the United States. 
U. S. Geol. Surv., 16th Ann. Rept., part ii, pp. 277-341, pis. xviii-xxiv. 
Gives an account of the methods of collecting and testing materials 
employed. Describes the character of road-building materials of gla- 
cial origin, in bedded rocks, and dike and vein stones, in Massachusetts. 
Contains a discussion of topographic conditions affecting road building, 
a description of the brickmaking clays and road-making gravels, and 
statistics concerning the resistance to wear of road-building stones. 
432 Origin, distribution, and commercial value of peat deposits. 
U. S. Geol. Surv., 16th Ann. Rept., part iv, pp. 305-314. 
Describes the formation of peat and the distribution of peat bogs in 
the United States. 
433 [Dislocations of the Cretaceous and Tertiary rocks of Mar- 
thas Vineyard, Mass.]. 
Geol. Soc. Am., Bull., vol. vi, p. 7 (| p.). 
In discussion of paper by Arthur Hollick on "Dislocations in certain 
portions of the Atlantic Coastal Plain strata and their probable causes," 
discusses the character of the folds and of the topography which existed 
when the region was invaded by the ice sheet. 
