MARGINULINA GLABRA. 233 



water, but has been found at a depth of 1360 fathoms. D'Orbigny's type specimens 

 were from the Adriatic, and the shell has been found recently in the Mediterranean 

 (Brady). Geographically Rh. tricarinatum extends to the Gault of Folkestone ; 

 specimens have also been found in the Red Chalk of Speeton, in the London 

 Clay (Eocene), in the Miocene of Malaga and Vienna, in the Pliocene of Italy and 

 Garrucha (South Spain) ; and we have specimens in our own collections from the 

 Casterlian and Scaldisian of Antwerp. In the Coralline Crag we have found it 

 plentifully in every zone examined. 



Genus 6. — Maruinulina, cVOrhigiiij, 1827. 



Part I, 1866, p. 68. 



Brady, Report ' Challenger,^ 1884, ^j?. 90 and 526. 



Additional Synonyms : 



Maeginulina. — Andreae, Stache, Philippi, Bailey, Hantketi, Giimhel, Fornasini, 

 BertJielin, Czjzeh, Schwager, Sherborn, Chapman, Ehrenberg, 

 DunihowsM, Mariani, Blake, Deeche, Touthowshi, Zwingli, 

 Kilhler, Brown, Vanden BroecJc, Basset, Balkioill and Wright, 

 Mangin, Seguema, Terrigi, Egger, Goes, Bronn, Greene, 

 Sartioig, Nicholson, Moherg, M. Sars, Beudant, Franzenau, 

 JRzehak, Mackie, Prestwich, Williamson, Schlicht, Ansted, and 

 others. 



General Characters. — Test elongate, straight or curved, with a partially spiral 

 commencement; subcircularorsuboval in section ; aperture marginal ; shell smooth 

 or ornamented. 



1. Marginulina glabra, d'Orhigny, 1826. Plate I, fig. 26. 



Part 1, 1866, page 69 ; and Append. I and II, Tables, No. 45. 

 Additional Synonyms : 



Maeginulina eloxgata, f^OrS., 1840. Mem. Soc. Geol. France, vol. iv, p. 17, 



pi. i, figs. 20—22. 



— PEDiFOEMis, Bornemann, i.855. Zeitsch. Deutsch. Geol. Ges., 



vol. vii, p. 32G, pi. xiii, fig. 13. 



— conteacta, Cos^a, 1856. Atti Accad. Pont., vol. vii, p. 186, pi. xiii, 



fig. 10. 



