Podocnemis somaliensis, a new pleurodiran turtle from the Middle Eocene of Somalia
A new pleurodiran turtle, Podocnemis somaliensis, is described from the Middle Eocene of Somalia.
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Some Late Silurian Bryozoa from the Canadian Arctic Islands
One new species of trepostome Diplotrypa franklini, and two species of cyclostome Fistulipora(?) mutabilis Hennig and Cyclotrypa silurica Hennig originally described from the Ludlovian rocks of Gotland are characteristic of the Early Ludlovian shelly faunas scattered throughout the Canadian Arctic Islands.
Upper Cretaceous foraminifera from the Ballydeenlea Chalk, County Kerry, Ireland
Twenty-three species of Upper Cretaceous foraminifera have been recovered from the newly discovered (Walsh 1960) Ballydeenlea Chalk of County Kerry, Ireland. These are the first Upper Cretaceous foraminifera reported from the Republic of Ireland and the westernmost Upper Cretaceous fauna found in Europe. This faunal assemblage shows that the Ballydeenlea Chalk can be correlated with part of the Upper Chalk (Senonian) of England and Northern Ireland.
Schizochroal eyes and vision in some phacopid trilobites
Some aspects of vision in nine species of phacopid trilobites are described. Methods of study, which primarily consist of the investigation of the morphology of the visual surface and the extent and nature of the visual field, are identical with those of previous work.Divergent interpretations of intraspecific variation in the lens number of Phacops sp. are discussed and sexual dimorphism is advanced as a tenable hypothesis.
Two cristate megaspores from the Lower Carboniferous of Scotland
A new megaspore described under the name Triletes pannosus sp.nov. resembles in its crest of anastomosing hairs T. subpalaeocristatus Alvin from the same locality. A new specimen of this latter species has yielded further details of its structure. Comparison is made between the two species.
A phylloceratid ammonite from the Speeton Clay (Lower Cretaceous) of Yorkshire
Hypophylloceras cf. perlobatum (Sayn) is described and illustrated. It is the first phylloceratid ammonite to be recorded from the Neocomian of Britain.
The Upper Devonian index ammonoid Cheiloceras from New South Wales
Cheiloceras acutum (Munster) from a presumed equivalent of the Baldwin Formation (Upper Devonian) near Tamworth, N.S.W. is described as the first occurrence of this index genus in eastern Australia.
Description of dimorphism in Striatopora flexuosa Hall
Striatopora Hall comprises branching favositoid tabulate corals with thick, dilated walls near the outer surface of the colonies. Study of serial sections of the type species, S. flexuosa Hall, shows that individuals within colonies commonly originated in one of two positions, either near the axis of the colony or near the boundary between inner thin-walled and outer thick-walled zones. Corallites originating in the two positions are morphologically distinct and were produced alternately by corallites of the first type. Corallites of the second type did not reproduce asexually.
A new productid brachiopod from the Upper Viséan of Scotland
Promarginifera trearnensis gen. et sp. nov. a productid brachiopod from the Upper Visean of Ayrshire, Scotland is described. It occurs in the Dockra Limestone 65 ft. below the Visean-Namurian junction. Morphologically the form has affinities with both the marginiferids and dictyoclostids but on the evidence of a marginiferid cardinal process and discontinuous marginal ridges it is classified as a marginiferid of the subfamily Costispiniferinae.
Devonian schizophoriid brachiopods from western Europe
Six species and one subspecies of the genus Schizophoria are described from the Devonian of western Europe, with their stratigraphical ranges and postulated phylogeny. All taxa are shown to be externally and internally distinct. Neotypes are proposed for Schizophoria provulvaria (Maurer) and S. strigosa (Sowerby).