222 



cylindric ; upper volutions extremely small and scarcely 

 defined by the suture, the apex obtuse ; aperture narrow, 

 nearly extending the entire length of the shell and 

 spreading a little at the base ; outer lip thin ; pillar 

 with four strong folds. i . . . i . Tenby, very rare. 



TRIBE. INVOLUTA. 



Shell destitute of a canal, but having the base of the 

 aperture effuse or notched and its whorls so com- 

 pressed and convolute that the last almost or entirely 

 conceals the rest. 



GENUS. OVULA. 



Turgid, attenuated at each extremity, subacuminated ; 

 margins convolute ; aperture longitudinal, narrow, 

 effuse at the extremities ; pillar lip toothless. 

 Oc PATULA. Sow. in Z. J, 4. p. 161. BULLA P. 

 Pen. 4. p. 117. t. 70. /. 85a.D<m. t. U3.~Mont. 

 p. 207. Lin. T. 8. p. 121. Dor. Cat. p. 43. t. 12. 

 f f S.D. p. 475. VOLVA P. F. p. 331. Oblong, 

 smooth, white, pellucid, tho upper end extending beyond 

 the body, the base more extended ; aperture large, ter- 

 minating in a short canal at each end, most contracted 

 at the top ; columella twisted, forming a subumbilicus ; 

 outer lip plain and very acute. J...1. Weymouth. 



