80 Scientific Intelligence. 



non-plicate species, these had best be restored to Orthothetina, a 

 name here abandoned), and Schellwienella (new, genotype Spi- 

 rifera crenistria Phillips, heretofore thought to have the internal 

 characters of Orthotetes). Six new species are described. 



c. s. 



5. Geological Excursion in the Grand Canyon District ; by 

 D W. Johnson. Proc. Boat. Soc. Nat. Mist., vol. xxxiv, p. 135- 

 161, 1909. — This presents a study of faulting in a part of the 

 Grand Canyon district and is of considerable interest in showing 

 for how long a period movements have continued in the region. 

 Thus the author finds that three periods of faulting are shown in 

 the area of the San Francisco Plateau, along the same plane ; the 

 first and second periods separated by a long era of base-levelling, 

 while the second and third were divided by a shorter, but yet 

 distinct, interval of erosion. In the main the faults of the region 

 are of ancient date. The paper is illustrated by a number of ex- 

 cellent half-tone cuts of photographs. l. v. p. 



6. Aufbau des Gebirges in der Umgebiing der Strassbvrger 

 Hutte an der Scesaplana ; von W. von Seidlitz. Festschr. 25- 

 jahr. Best. d. Sekt. Strass. i. E. d. deut. u. osterreich. Alpenver. 

 Pp. 45-68, 1910, Strassburg. — This is a small geological guide, 

 well planned and excellently carried out. It describes the geob 

 ogy surrounding an elevated point in the Raetikon Alps, on the 

 border between the Tyrol and Switzerland. It is an excellent 

 lesson in tectonics, folding, faulting, and thrusting being visible 

 on a gigantic scale. A large panorama, well drawn and geolog- 

 ically colored, is a prominent feature of the work, which is also 

 illustrated by a number of sections and photogravure plates of 

 the scenery. l. v. p. 



7. Granites of the Southeastern Atlantic States; by T. L. 

 Watson. Bull. 246 U. S. Geol. Surv., pp. 282, 1910. — The author 

 has given in this work a general description of the granite areas 

 in the region mentioned, extending from Maine to Georgia, and 

 including Tennessee and Alabama. The petrographic, physical, 

 and chemical properties of the varied occurrences are stated, and 

 especial emphasis is laid upon their technical exploitation and 

 use. The work is illustrated with many maps, diagrams, and pho- 

 tographs, the latter chiefly of granite quarries. While its value is 

 mostty on the economic side, and it should prove of great service 

 in the granite quarrying industry, it has none the less scientific 

 interest and is a useful work of reference for geologists and 

 petrographers. l. v. p. 



8. The Volcanic Rocks of Victoria ; by E. W. Skeats. 

 Address by the Pres. Sec. C, Aust. Assoc. Adv. Sci., 1909. — This 

 paper contains a general account (and a full bibliography) of the 

 igneous rocks in this part of Australia ; it will undoubtedly prove 

 of considerable local service, and to the general reader it empha- 

 sizes once more what a wide distribution the alkalic rocks have in 

 Australia. The brief descriptions are materially aided by the 

 considerable number of analyses which are quoted. The article 

 is accompanied by several sections and a map. l. v. p. 



