72 PALEOBOTANY [Box. Absts., Vol. VIII, 



of their remains for museum purposes. — A great autumn freshet of the upper Schoharie in 

 1869 revealed in the bed rock of the hills a series of standing stumps of trees all at the same 

 level in the rocks and their rootlets in the original mud, now shale, thus revealing the most 

 ancient forest yet known. These trees are preserved at least at two levels in the rock, one 60 

 feet above the other. — L. Pace. 



487. HoLTENDAHL, O. Occurrcnce of structures like Walcott's Algonkian Algae in the 

 Permian of England. Amer. Jour. Sci. 1 : 195-206. Fig. 1-8. 1921. — Forms from the English 

 Permian are described and illustrated that greatly resemble the Algonkian forms called 

 Newlandia and Greysonia by Walcott, and that are considered as in all probability secondary 

 structures and not of organic origin. — E. W. Berry. 



488. Kratjsel, R. Die fossilen Koniferenholze (unter Ausschlusz von Araucarioxylon 

 Kraus). Versuch einer monographischen Darstellung. [Attempt at a monographic treatment 

 of fossil coniferous wood, exclusive of Araucarioxylon.] Palaeontographica 62: 185-275. 1919. 

 — A monographic treatment of fossil coniferous woods, giving besides an alphabetic list of the 

 hitherto described species (with bibliographic references, synonymy, and horizons); also a 

 historical introductory section and a systematic synopsis of the recognizable forms (with 

 corresponding existing forms, horizons, and localities). The author dissents from Jeffrey's 

 view of the relationships among the coniferous families, and on the basis of histologic studies 

 by himself and other students, holds that the Araucariaceae are the older and the Abietine- 

 aceae the younger groups. The bibliography comprises 243 titles. — Saml. W. Geiser. 



489. KrXusel, R. Palaeobotanische Notizen. Senckenbergiana 2: 198-215. 1920. — 

 This communication comprises three parts. The first, p. 198-204, consists of additions to this 

 author's recently published monograph on fossil coniferous woods (see Bot. Absts. 8, Entry 

 488). The second, "Zur Bestimmung fossiler Koniferenholzer" [The determination of fossil 

 coniferous woods], is a 4 page summary of current ideas. The third, "Uber die Lignite von 

 Senftenberg [Upon the lignite of Senftenberg], gives the results of a study of the wood struc- 

 tures from this Miocene horizon which is widespread in Saxony, Silesia, Mecklenburg, Mark 

 Brandenburg, etc. The author determined the percentage representation of Taxodium and 

 Sequoia in the lower, middle, and upper parts of the lignite in the various mines at Senften- 

 berg, and discusses the probable ecology. — E. W. Berry. 



490. Krausel, R. Nachtrage zur Tertiarflora Schlesiens. III. Uber einige Originale 

 Goepperts und neuere Funde. [Additions to the Tertiary flora of Silesia. III. Upon some of 

 Goeppert's types and new collections.] Jahrb. Preuss. Geol. Landes. 40:363-433. PI. 5-15. 

 1920. — This paper concerns it.self with Goeppert's types and with new collections from Ruppers- 

 dorf, Peruschen, Oppatowitz, and Bluschau. No new forms are described but the older 

 determinations are revised. Species in the following genera are discussed: Woodwardia, 

 Pteris (2), Salvinia, Pinus, Taxodium, Glyptostrobus , Sequoia, Taxodioxylon, Libocedrus, 

 Widdringtonia, Salix (2), Populus (2), Myrica, Juglans (3), Hicoria, Pterocarya, Carpinus, 

 Belula (2), Castanea, Quercus, Ulmus (2), Zelkova, Cinnamomum, Persea, Philadelphu^, 

 Liquidambar , Platanus, Crataegus, Rhus, Acer (4), Paliurus, Vitis, Grewia, Buettneria, 

 Cornus, and several undetermined types. All are of Miocene age, those from Bluschau and 

 Oppatowitz being regarded as older than Schosnitz (Tortonian) and those from Peruscher 

 being regarded as younger (presumably Sarmatian). — E. W. Berry. 



491. LozANO, E. D. Depositos diatomiferos en el valle de Toxi, Ixtlahuaca, Estado de 

 Mexico. [The diatomaceous deposits of the Toxi Valley, Mexico.] An. Inst. Geol. Mexico 9: 

 1-19. PL 1-5. 1920. — The author describes the diatomaceous deposits of the valley of Toxi 

 and records and figures diatoms representing the genera Synedra, Surirella, Coscinodiscus, 

 Cycloiella, Gaillonella, Encyonema, Epithemia, Navicula, and Pleurosigma. The deposits 

 were laid down subsequent to the volcanic rocks of the region and are considered of fresh 

 water origin and Pleistocene age. — E. W. Berry. 



