GENUS TRUNCATULINA. 301 



Planobbulina Mediteeeanensis, Egger, 1895. Jahresb. xvi, Nat. Ver. Passau, 



p. 32, pi. V, figs. 12, 13. 

 — — Goes, 1896. Bull. Mua. C. Z. Harvard Coll., 



vol. xxix, p. 73. 



Characters. — Shell free at first, parasitic afterwards, tliin, outspread, one face 

 (" superior " and attached), somewhat flatter than the other ; the periphery almost 

 circular, subaugular, or irregular. Chambers numerous, inflated, arranged sub- 

 cyclically on one plane ; early spiral chambers visible in the middle of the 

 attached face ; septal orifices somewhat obscure, but usually at both ends of the 

 outer chambers on the periphery. 



PI. II, fig. 3, represents a feeble individual of the Northern form vulgaris. 



Occurrence. — According to the ' Challenger ' Report, this species occurs " in 

 almost every sea within the temperate and tropical zones." It is commonest at 

 depths of less than 50 fathoms, but one specimen has been found at a depth of 

 1125 fathoms. Egger in his ' G-azelle ' Memoir records the occurrence of rare 

 specimens at one station off Kerguelen Island. 



Fossil specimens have been obtained from the Oligocene of Elsass, the Miocene of 

 Vienna and Muddy Creek (Victoria), the Pliocene of Italy, Antwerp (Casterlian), 

 and St. Brth, and in the Pleistocene of many localities. In the Coralline Crag 

 we have examples from every zone examined. 



Genus 4. — Truncatulina, cVOrhujny, 1826. 

 Brady, Report ' Challenger,' 1884, pp. 73, 655, and 658. 



Nautilus, Walker and Boys, Ficlitel and Moll, Maton and Rachett, Turton, 

 Pennant, Dillwgn. 



Sekpula, Montagu. 



EoTALiA, Lamarck, d'Orbignij, Bonier, von Seitss, Karrer, Stache, von Oilmhel. 



PoLYXENES, de Mnntfort. 



CiBiciDEs, de Montfort, Blainville. 



Ceistellaeia, Lamarck. 



Tbuncatulina, d'Orbigny, Bronn, von Miinster, Burner, von Betcss, Oosta, Egger, 

 Parker and Jones, Williamson, Karrer, Seguenza, Brady, Q. M. 

 and J. W. Davison, M. Sars, von Santken, Win f her, Wright, 

 Terquem, Toutkoioski, Andreae, Ehrenlerg, Terrigi, Malagoli, 

 Schwager, JJlilig, Karrer, von Oiimiel, Oosse, Maniell, Pictef, 

 Carpenter, Marsson, Hopkins, Nicholson, Sherbom Chapman, 



