Von Ust-Balei liegt zwar nur ein Fetzen der Fieder vor, dieser ist aber sehr schön erhalten. Die Fiederchen sind fast gegenständig; am Grund am breitesten und die Ecken etwas abgerundet. Die ganz flachen , aber breiten Zähne sind stumpf, in jeden läuft ein sehr schwacher Secundarnerv. Dieser ist zunächst in zwei Gabeln gespalten; der untere Gabelast bleibt meist einfach, während der obere nochmals in 2 Aeste getheilt ist. Dieselbe Nervation zeigen auch einige von Schmalhausen abgebildete Blattfiedern, so Taf. III.
VEBA-EXPEDITIONENS VETEN SK APLIG A ABBETEN.^^9 to trace out the limits of the species. , Also were rich, but less interesting materials obtained from algse, collected near Cape Deschnew. Several samples of the bottom-mud from the North Siberian Sea were also taken, but in examining them I could not find a trace of diatoms. All the materials from the expedition of the Vega have been examined by myself. Still more materials from the hyperboreal America were collected during the British expedition under the command of Sir George Nares and examined by Mr. G. Dickie'. Afterwards I have received, through the kindness of Prof. Oliver, some of these samples. Among them only three were rich enough to be subjected to the usual cleaning-process, viz. from JBessel's Bay, 81°7' N, Mushroom Point, 82°28' N, and Discovery Bay, 81°41'. The result of my examination of these gatherings are to be found in the following pages. Also from the distant Franz Joseph Land some diatomaceous gatherings have been collected on the ice-flakes during the Austrian expedition under Weyprecht. Some of the species found by Mr. Grunow in these materials have been published in Van Heurck's Synopsis and issued in CI. and MoUer Diat. No 314. Mr. Grunow will later publish in a more complete manner his researches in regard to these most interesting diatoms. The materials brought together from the Arctic Sea are thus very considerable, and their examination may give a tolerably complete idea of the diatomaceous vegetation the Arctic Sea. I have therefore tried to give in the following pages a complete list of all the arctic species, found by myself and by Mr. Grunow, omitting those found by other authors, not beeiug sure about their determinations.
survey von Irland, dieselbe bearbeitet und ein Verzeichniss veröffentlicht **). Von den genauer bestimmten 47 Arten wurden folgende auch im Bergkalk Irlands gefunden: ') Von dun marinen Thieren, welche Baily aus demselben anführt, hebe hervor: Spirifer striatus, Sp. bisnlcatus, Productus gigahteus, Pr. punctatus, Pr. plicatilis, Penestella antiqua, die auch im Bergkalk der I >;i reu [nsel aachgi « iesen sind. ") Meinoires of (In-Geolog. Survej of [reland 1864, p. 15 und folgende. Auch Salter hat sieh mit dieser Fauna beschäftigt. Kr führt aus dem Kohlenschiefer dir Fenestella plebeja, Spirifer cuspidatus, Sp. disjunctus ?, Orthis Michelini, Streptorhynchus crenistria, Athyris squamosa, Rhynchonella pleurodon und Madiola Macadami an; aus dem Coomhola-Grit Rhynchonella pleurodon, Spirifer disjunetus (Sp. Verneuilii Murch.) und Avicula 1) noniensis. Er zog aus diesen Vorkommnissen den Schluss, dass dieser Kohlenschiefer in der obern Abtheilung die gewöhnlichen Carbon-Arten enthalte. Vgl. Quarterlj Journ. of the Geol Soc. of London 1863, p. 4s7.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.