14 BULLINELLA. 



outer marprin longer than the axis of the shell ; columella having 

 near its anterior extremity a small plication ; often umbilicated. 



This genus may be distinguished from Bulla, with which it is 

 often confounded, by being more cylindrical in form and by the 

 possession of the columellar plication alluded to. 



Type. — Bulla cylindracea, Pennant. 



Bullinella exigua, Tenison-Woods (sp.). 



1880. Cylichna exigua, Tenison-Woods, Proc. Linn. Soc. N.S."W. vol. iv. 



p. 19, pi. ii. fig. 6. 

 1893. Cylichna exigua, Tate and Dennant, Trans. Eoy. Soc. South Aust. 



vol. xvii. p. 223. 



This species appears to play the same rdle in the Australian 

 Eocene as does B. uniplicata, J. de C. Sby. {—B. hruguierei, 

 Deshayes), in the Eocene of North-western Europe, and B. galba, 

 Conrad, and B. saint-hilairei, Lea, of homotaxial beds at Claiborne, 

 Alabama, in the "United States. It is a long, cylindrical shell ; the 

 aperture is dilated anteriorly ; columellar border flattened in the 

 vicinity of the rather deep umbilicus and carrying a well-marked, 

 twisted plication ; spiral striaj on the body-whorl most conspicuous 

 towards the anterior portion, and on and in the deep apical de- 

 pression ; rugosities of growth strongly developed. 



Dimensions. — Length 17 mm. ; breadth 7 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



G. 4297. Several specimens. Presented ly John Dennant, Fsq. 

 G. 4748. One specimen. Pres. hy Prof. T. Rupert Jones, F.R.S. 



Bullinella arachis, Quoy and Gaimard (pp.). 



1832. Bulla arachis, Quoy and Gaimard, Voy. de 1' Astrolabe, Zool. t. ii. 



p. 361, Atlas, pi. xxid. figs. 28-30. 

 1850. Bulla {Cylichna) arachis, A. Adams, Thes. Conch, vol. ii. p. 590, 



pi. exxv. figs. 133-4. 

 1873. Cylichna striata, Hutton, Cat. Marine Moll. N.Z. p. .52. 

 1873. Cylichna striata, Hutton, Cat. Tert. Moll. N.Z. p. 16. 

 1880. Cylichna striata, Hutton, Man. N.Z. Moll. p. 120. 

 1887. Cylichna arachis, Dennant, Trans. Roy. Soc. Vict. vol. xxiii. p. 240. 

 1893. Cylichna arachis. Button, Linn. Soc. N.S.W., Macleay Mem. Vol. 



p. 37. 

 non Cylichna arachis, Tenison-Woods, Pap. Eoy. Soc. Tas. 1876, p. 102 



(=Cylichna ivoodsi, Tate). 



