weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898 49 
348 Hidden (W. E.) and Pratt (J. H.) on rhodolite, a new variety of 
garnet. 
Am. Jour. ScL, 4th ser., vol. v, pp. 294-296; Review, Am. Nat., vol. 
xxxii, p. 613 (ip.), 1898. 
Describes the occurrence and chemical character of the material 
occurring in North Carolina. 
349 Twinned crystals of zircon from North Carolina. 
Am. Jour. ScL, 4th ser., vol. vi, pp. 323-326, 6 figs., 1898. 
Describes crystallographic characters of the material. 
350 On the associated minerals of rhodolite. 
Am. Jour. Sci., 4th ser., vol. vi, pp. 463-468, 2 figs., 1898. 
Describes the characters of a number of minerals associated with 
rhodolite in Macon County, North Carolina, and gives chemical analyses 
of gahnite and iolite. 
351 Hilgard (E. W.). See Day (W. 0.), No. 227. 
352 Hill (Eobert T.). The geological history of the Isthmus of Panama 
and portions of Costa Eica. Based upon a reconnaissance 
made for Alexander Agassiz. 
Harvard Coll., Mus. of Comp. Zool., Bull., vol. xxviii, No. 5, pp. 151- 
285, pis. i-viii, figs. 1-24, 1898; Review by R. D. Salisbury, Jour, of 
Geol., vol. vi., pp. 661-668; Abstract, Am. Jour. Sci., 4th ser., vol. vi, 
pp. 505-508, 1898. 
Describes the geologic and geographic features of the Isthmus and a 
section across Costa Rica. Compares the two sections. Discusses the 
evidences of land connections between the two oceans at different geo- 
logic periods. Includes petrographic descriptions of various specimens, 
by H. W. Turner. 
353 Cuba. 
Nat. Geog. Mag., vol. ix, pp. 193-242, 9 pis., 12 figs., 1898. 
Includes a description of the physiographic features, geologic struc- 
ture, and a geologic sketch map of the island. 
354 The stratigraphic succession in Jamaica. 
Brit. Assoc. Adv. Sci., Rept. 1897, p. 642 (£ p.), 1898. 
355 . and Vaughan (Thomas Wayland). Geology of the Edwards 
Plateau and Eio Grande Plain adjacent to Austin and San 
Antonio, Texas, with reference to the occurrence of under- 
ground waters. 
U. S. Geol. Surv.,18th Ann. Rept., Pt. II, pp. 199-321, pis. xxi-lxiv, figs. 
53-76, 1898. 
Describes the physiography of the region, the character and occur- 
rence of the Comanche and Gulf series and the Eocene strata and the 
occurrence of underground waters. 
356 The Lower Cretaceous Gryphaeas of the Texas region. 
U. S. Geol. Surv., Bull., No. 151, 138 pp., pis. i-xxv, figs. 1-2; Review by 
W. T. Lee, Jour, of Geol., vol. vi, pp. 758-759, 1898. 
Gives the history of the discovery of forms referred to Gryplnea pitch- 
eri Morton, discusses their differentiation, and describes the geographic 
and stratigraphic distribution, classification and evolution of the Texas 
Lower Cretaceous Grypha'as, with descriptions of several species. 
Bull. 102 4 
