The foraminifera: an introduction to the study of the protozoa . Johns series. They have been referred by theabove authors to the genera Glohigerina andOy^hulina. The Cambrian strata of Siberia have, accordingto De Lapparent, lately yielded foraminiferal remainsin some abundance in the limestones of a plateautraversed by the Olenek. An interesting discovery of an Upper Cambrianforaminiferal fauna in a shaly limestone near ChaseEnd Hill, in Shropshire, was lately made by ProfessorGroom, and the organisms have been described by thewriter. The collection comprises a number of generawith hyaline t
The foraminifera: an introduction to the study of the protozoa . Johns series. They have been referred by theabove authors to the genera Glohigerina andOy^hulina. The Cambrian strata of Siberia have, accordingto De Lapparent, lately yielded foraminiferal remainsin some abundance in the limestones of a plateautraversed by the Olenek. An interesting discovery of an Upper Cambrianforaminiferal fauna in a shaly limestone near ChaseEnd Hill, in Shropshire, was lately made by ProfessorGroom, and the organisms have been described by thewriter. The collection comprises a number of generawith hyaline tests which are very well preserved, thetubuli of the shell-wall appearing quite distinctly in 254 THE FOEx\MINIFERA many of the specimens. The commonest genus inpoint of numbers in this rock is SjririUina (see ), and the particular form is not so very differentfrom a species now often met with in shallow wateroff the British coasts. The other genera accompany-ing the S]jiriUince- of the Upper Cambrian areLagena, Nodosai-ia, MarginuUnd, and Fig. 27.—Spirillina Eock ; Upper Cambrian,Malverns. X 36. In the Ordovician system the shales above theBala limestone at Guildfield, near Welshpool, havebeen recorded as foraminiferal by W. Keeping. In the Silurian system the Llandovery beds ofCwm Symlog have yielded to J. F. Blake Dentalinacommunis and to W. Keeping Textularia, Dentalina,and (?) Botalia. From the Woolhope Limestone of the MalvernsH. B. Brady obtained four species of Lagena, which GEOLOGICAL EANGE 255 he referred to more recent types, although the generalsurface of the tests, as well as the ornamentation, ismuch coarser. In sections of the Wenlock Limestone of theMidlands the writer has frequently noticed smallforms of Lageme, and he has lately described somespecies belonging to the genera HijperamTnina andStacJieia from the Wenlock Series of Gotland. Thelatter genus has also been obtained by A^ine from theWenlock shales of England, and described by him
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