132 PORAMINIFERA OF THE CRAG. 



1. 1845-6. ' Verst. Bohm. Kreideform.,' p. 33, pi. siii, figs. 64 and 65, 

 " Operculina cretacea" resembles G. angigyra, Reuss. 



2. 1860. "Sitzungsb. k. Akad. Wiss. Wien,' vol. xl, p. 177, pi. i, fig. 1, 

 " G. cretacea " seems to be a crinkled variety of G. Beussi. 



3. 1863. Ibid., vol. xlvi, p. 34, pi. i, fig. 10, " G. cretacea " is equivalent to 

 C. Beussi ;^ fig. 11 and fig. 12, var. " irregularis" are most likely Trochammina and 

 Ammodiscus . 



The little discoidal forms, in the Gault of Folkestone, which resemble 

 Gornuspira are now found by Mr. Chapman to be Ammodiscus if examined by 

 transmitted light. 



Occurrence. — Gornuspira foliacea has a wide range in recent seas, but is more 

 commonly met with in the North Atlantic. The finest specimens have been found 

 at depths ranging from 300 to 600 fathoms. It occurs, however, in shallow 

 waters, and in the deep sea down to 1500 fathoms. The geological range of 

 this species extends (if the published forms are not Ammodiscus) from the Gault 

 of Folkestone (Chapman) through the Calcaire Grossier of the Paris Basin, the 

 Oligocene of Germany (Reuss), the Miocene of Vienna (Czjzek), and of Muddy 

 Creek, Victoria (Howchin), the Pliocene of Southern Italy (Costa) and St. Erth 

 (Millett), to the Pleistocene. The Crag specimens were obtained fi'om Sutton 

 only. 



Gornuspira invohens is found in all seas, and at depths varying from 7 to 

 1900 fathoms. It is, however, found but rarely in depths exceeding 700 fathoms. 

 It is specially at home in the north and south temperate and frigid zones. Its 

 geological range equals that of G. foliacea, but it has also been recorded from the 

 London Clay (Sherborn and Chapman). In the Crag, in addition to the occur- 

 rence already recorded from Sutton, we have found it at Broom Hill and 

 Ged grave. 



Genus 2. — Peneboplis, de Montfort, 1808. 



Bradu, Beport ' Ghallenger,' pp. 62 and 203—208. 



Part I, 1866, page 17. 



General Characters. — Chambers undivided ; either piano-spiral throughout, or 

 at first spiral, then rectilinear or cyclical. 



1 And referred by Reuss to the corrugated form, ibid., vol. il, p. 177, pi. i, fig. 1. 



