834 FORAMINIPERA OF THE CRAG. 



ROTALIA CALCAn, Brady, 1884. Report 'Challenger,' pp. 627, 709, pi. cviii, 



figs. 3 and iC?). 

 EoTALiNA CALCAE, Egger, 1&93. Abli. k. Bayer. Alt. Wiss., vol. xviii, p. 423, 



pi. xix, figs. 1 — 3. 



Characters. — Shell biconvex, with a marginal armatnre arising from the 

 angular or pointed peripheral ends of the chambers, the shell having a pointed or 

 zigzag outline according to the size and shape of the projecting angles. 



Occurrence. — Botalla calcar appears to be a shallow-water form, and to be most 

 at home in tropical waters. The ' Challenger ' apparently gathered no specimen, 

 but Brady mentions in his Report that the species " is not uncommon in the 

 shallow-water coral-sands of the East and West Indies ; it occurs also in the 

 Mediterranean and the Red Sea ; on the shores of Madagascar, the Mauritius, and 

 Ceylon ; and at the Cape of Good Hope." The ' Gazelle ' obtained specimens, but 

 few in number, from the Maiu'itius and off the south-west of Australia. 



The records of the species in a fossil condition extend to the Eocene (Calcaire 

 Grossier — Terquem) ; it has also been obtained from the Barton Beds (Brady) ; 

 from the Miocene of Malta (Brady) and Muddy Creek (Howchin) ; from the 

 Casterlian and Scaldisian of Antwerp (Burrows and Holland) ; and from St. Erth 

 (Millett). In the Coralline Crag it is not uncommon, and we have specimens 

 from every zone examined. A few minute specimens have also been met with in 

 the Red Crag of Essex, as recorded in the First Part of this Monograph. 



Sub-family 3. — TmopORiNiE. 



Brady, ' Challenger ' Report, p. 74. 



Chambers irregularly heaped ; with or without a spiral primordial portion. 

 Usually without any general aperture. 



Genus 1. — Gypsina, Carter, 1877. 



Brady, Report ' Challenger,' 1884, |)jj. 74 and 716. 



Ceeiopoea, Beuss. 

 AcEEVULTNA, Schulfze, Marsson. 

 Oebitolina,^ Parker and Jones. 



1 The little, globular and hemispherical, bead-like fossils from the Chalk, formerly also referred 

 to Orhitolina by Parker and Jones (' Ann. Mag. Nat. Hist.,' ser. 3, vol. vi, 1860, p. 37), and by 

 others previously to Millepora, Tragos, and Coscinopora, have been placed, as being allied to 

 Hydractinia, in a new genus, Porosphxra, by Steinmann. Von Zittel also refers it to the Sydrozoa ; 

 but Nicholsgn thinks it may be a sponge. 



