52 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [ruil.149. 
354 Ihlseng (M. 0.)- A phosphate prospect in Pennsylvania. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. Ill (cont.), pp. 955-957, 1896. 
Describes the occurrence of phosphatic material in Juniata County, in 
the detntal material between the Oriskany sandstone and Lower Held- 
erberg limestone. 
355 Ingalls (Walter Kenton). The tin deposits of Durango, Mexico. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 146-163, 1896. 
Presents a map of a portion of Mexico showing the location of the tin- 
ore deposits, describes the general geologic features and the character 
and distribution of the ore bodies, and discusses their origin. 
350 Irving (John Duer). The stratigraphical relations of the Browns 
Park beds of Utah. 
N. Y. Acad. Sci., Trans., vol. xv, pp. 252-259, pi. xviii, 1896. 
Gives a brief summary of previous work in the Tertiary strata of 
Utah, reviews certain descriptions of the Browns Park beds, and dis- 
cusses the evidences as to their geologic age. 
357 Jackson (Robert Tracy). Studies of PaUechinoidea. 
Geol Soc. Am., Bull., vol. vii, pp. 171-254, pis. 2-9, 1896. 
Describes a number of new species from the sub-Carboniferous of the 
Mississippi basin. Includes discussion of general results and their bear- 
ing and a proposed new classification and a bibliography of Paleozoic 
Echini. 
358 and Jagger (Thomas Agustus, jr.). Studies of Melonites mul- 
tiporus. 
Geol. Soc. Am., Bull., vol. vii, pp. 135-170, 1896. 
Describes the spines and the arrangement, development, structure, and 
variations of the ambulacra? and interainbulacral plates, and gives tables 
of plate arrangement. 
359 Jagger (Thomas A., jr.), Jackson (R. T.) and. Studies of Melon- 
ites multiporus. 
See Jackson (R. T.) and Jagger (T. A., jr.), No. 358. 
360 James (Joseph F.). Manual of the paleontology of the Cincinnati 
group. 
Cin. Soc. Nat. Hist., Jour., vol. xviii, pp. 115-140, 1896. 
Continues descriptions of fossils from the Cincinnati group in former 
papers noticed in Bulletins Nos. 130-135 and 146. 
361 Prof. Lesley's Final Eeport. 
Am. Geol., vol. xviii, pp. 323-329 (correspondence), 1896. 
Comprises a general review of Vols. I and II, Final Reportof the Second 
Geological Survey of Pennsylvania. 
362 Eeport of the State Geologist of New York for 1893 — a cor- 
rection. 
Am. Geol., vol. xviii, pp. 392-393 (correspondence), 1896. 
Refers to certain errors in citations. 
