136 EOCENE MOLLUSCA. 



No. 79. Ovula ? antiqua. F. R Edwards. Tab. XVII, fig. 3a— 6. 



0. testa elongato-ovali, sub-ventricosd, postice sub-acuminatd, Icevi : aperturd angustd, 

 postice eiongatd, in canali brevi, mediocriter lato, exeunti, antice effusd. 



Shell of a lengthened oval form, somewhat ventricose in the middle, slightly 

 acuminated at the posterior extremity, smooth : aperture elongated, narrow behind ; 

 posterior canal short, moderately wide. The anterior extremity is broken ; it 

 appears to have been rather more obtuse than the posterior one. The last volution is 

 smooth, but the surface of the preceding volution presents numerous transverse striae, 

 perspicuous towards the posterior extremity, and becoming obsolete as they approach 

 the middle of the whorl ; these striae are very fine, so much so as to be barely per- 

 ceptible by the naked eye. 



The only specimen I have seen forms part of Mr. Wetherell's collection ; it is too 

 imperfect for a detailed description, or even for ascertaining satisfactorily the genus to 

 which it belongs. It is apparently an immature shell just emerging from the first stage 

 of growth before the outer lip has become thickened or involute, and when the absence of 

 teeth on the columella is not conclusive of the genus. It may be the young shell of a 

 Cyprsea, resembling the C. acuminata of Melleville, and, therefore, I have referred it to 

 the present genus with doubt, and have named it provisionally only. 



Size. — Axis, \ an inch ; diameter, 2-10ths of an inch. 



Locality. — Primrose Hill. 



Genus 22d. Margin ell a.* Lamarck. 



Porcellana, Peribolus, Adansop, 1757. 

 Dactylus, Humphrey, 1797. 

 Marginella, Lamarck, 1801. 

 Marginelltjs, Montfort, 1810. 

 Persicula, Schum., 1817. 

 Volvaria, (sp.,) Lamarck, 1822. 



Marginella, Glabella, ^ 



■\t „ . n T „„ „ T J Swainson, 1840. 



Volutella, Gibberula, 5 ' 



PhjENOSPIRA, Cryptospira, Hinds, 1844. 



Gen. Char. — Shell oval, oblong, smooth, enamelled ; spire short, sometimes almost 

 concealed : aperture elongate, narrow, truncate, sometimes broadly but not deeply 

 notched in front; outer lip thickened externally, inner margin sometimes smooth, 

 generally crenated ; columella with distinct plaits, more or less numerous. 



* Etym., Diminutive of Margo, a rim or margin. 



