426 Metiews — R. Kiich — Volcanic Rocks of Colombia. 



this, the regular succession of zones in Russia and England, holding 

 a similar fauna, justifies the anticipation that the pai"allelism between 

 the Upper Jurassic and Necomian beds of Eussia, and those of 

 Western Europe, may yet be established upon the firm basis of 

 palasontological facts. 



In his chapter on the comparative sti'atigraphy of the Speeton 

 Clay (pp. 156-201), M. Pavlow cites the opinions of Toncas, 

 Oppel, Blake, C. Struckmann, Nikitin, Tchernychew, and others, on 

 the question of the age of the Portlandian and Tithonic. While not 

 discussing the point as to whether these formations belong to the 

 Cretaceous or to the Jurassic, M. Pavlow observes that the history 

 of the development of the faunas, so far as they are known, is 

 distinctly opposed to the division of the Tithonic and the Port- 

 landian between the two systems. 



The following new species of Belemnites are described by M. 

 Pavlow, viz., Belemnites oheliscoides, B. explanaloides, B, Rouillieri, 

 B. mosquensis, B. hreviaxis, B. cristntus, B. obtusirostris, B. speeton- 

 ensis. A chapter upon the classification of Belemnites (pp. 89-96) 

 follows the description of the species, the divisions adopted being 

 based upon those of Neumayr, viz., (1) Notocoeli, (2) Bipartiti, (3) 

 Dilatati, (4) Suprasulcati (= Canaliculati, Neumayr, uon Zittel), (5) 

 Acuarii, (6) Infradepressi. Of Ammonites the following new sub- 

 genera and species are described, viz., Virgalites (z=Ammonites of 

 the group Virgati, auct.) ; Craspedites (=:01costephani of the group 

 0. siihditus) ; Polyptychites ( = 01costephani of the group 0. polypfy- 

 chus), Olcostephanus {Polyptychites) triplodiptychus, 0. {P.) ramuli- 

 costa, 0. (P.) Beani, 0. (P.) gravesiforruis, 0. (P.) Lamplughi ; 

 Astieria (zrOlcostephani of the group 0. Astieri), Olcostephanus 

 (Astieria) sidcosns ; Simbirskites (=.01costephani of the group 0. 

 Decheni) ; Acanthoceras (?) peltoceroides. 



Arthur H. Foord. 



11. — The Volcanic Rocks of Colombia. 



W. Reiss and a. Stijbel : Reisen in Sud-Amerika. Geologischb 

 Studxen in der Republik Colombia. Part I. Petrographie. 

 1. Die Vulkanischen Gesteine. By Richard Ktjch. (Berlin, 

 1892. 4to. xiv. + 204pp. Nine Plates. 



DURING the past ten years many important additions have been 

 made to the knowledge of the volcanic rocks of the northern 

 Andes, including contributions by Karsten, Bonney, Siemiradzki, 

 Hettner, and Linck ; a far more elaborate work has now been 

 published giving the results of Dr. Kiich's searching investigation 

 of the large collection brought home by Drs. Reiss and Stiibel from 

 the expedition rendered famous by the important anthropological 

 discoveries that attended their excavations at Ancon. The specimens 

 of volcanic rocks alone number 1500, wliich are now preserved at 

 the Museums of Berlin and Dresden, or in the collection of Dr. 

 Reiss ; some of them have been previously described, as the memoir 

 of Carl Hopfner, issued in 1881, was based upon part of the material. 



