weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1895. 75 
478 Turner (Henry W.). Gold in serpentine. 
Am. Jour. Sci., 3d ser., vol. xlix, p. 478 (i j>.) (communicated). 
Refers to a previous article in which the occurrence of serpentine in 
gold-quartz veins is described. 
479 Volcanic dust in Texas. 
Science, new ser., vol. i, pp. 453-455. 
Gives a description by R. T. Hill of the locality where the material 
was found, and refers to similar volcanic material from Nebraska, Mon- 
tana, Idaho, and California. 
480 The gold belt of California. 
Abstract : Sci. Am. Suppl., vol. xxxix, pp. 16197-16198. 
481 Lindgren (W.) and. Marysville folio, California. 
U. S. Geol. Surv., Geol. Atlas of the U. S., folio 17. 
See Lindgren (W.) and Turner (H. W.), No. 297. 
482 Smarts ville folio, California. 
U. S. Geol. Surv., Geol. Atlas of the U. S., folio 18. 
See Lindgren (W.) and Turner (H. W.), No. 298. 
483 Udden (J. A.). Fossil frost cracks. 
Sci. Am., vol. lxxii, p. 102. 
Describes the occurrence of certain phenomena, considered to be frost 
cracks, in Cretaceous sandstone of the Black Hills, South Dakota. 
484 Ulrich (E. O.). On the structure and systematic position of 
"Anonialoides," and a proposal to change the name to 
Anomalospongia. 
Minn. Geol. and Nat. Hist. Surv. Final Rept., vol. iii, part i, pp. 68-74. 
Remarks on the previous description of Anomoloides reticulatus, and 
describes the characters of the new genus and species, Anomalospongia 
reticulatus. 
485 On Lower Silurian Bryozoa of Minnesota. 
Minn. Geol. and Nat. Hist. Surv., Final Rept., vol. iii, jiart i, pp. 96-332, 
pis. 1-28, figs. 8-20. 
Gives the terminology of Bryozoa, and remarks on the preservation, 
methods of study, classification, and geologic distribution of Paleozoic 
Bryozoa. Describes genera and species occurring in the Lower Silurian 
of Minnesota. 
48G Ulrich (E. O.), Winchell (N. II.) and. Historical sketch of inves- 
tigation of Lower Silurian in the Upper Mississippi Valley. 
Minn. Geol. and Nat. Hist. Surv., Final Rept., vol. iii, part i, pp. ix-liv. 
See Winchell (N. H.) and Ulrich (E. O.), No. 563. 
487 Upham (Warren). Late Glacial or Champlain subsidence and 
reelevation of the St. Lawrence river basin. 
Am. Jour. Sci., 3d ser., vol. xlix, pp. 1-18, with map. 
Discusses the evidences of the opeirogenic movements that began and 
ended the Champlain epoch. Describes the character and distribution 
of the beaches of the Glacial lakes that occupied the St. Lawrence basin. 
