94 
NERITA costata, 
TAB. CCCCLXHI. —Jigs. 5 and 6. 
Spec. Char. Hemispherical ; spire conspicu- 
ous, impressed ; whorls transversely cos- 
tated; costae thin, sharp, numerous; aper- 
ture expanded, orbicular; columellar lip 
prominent, obtuse. 
Rather shorter, but otheways resembling the many 
ridged harp in miniature ; its whorls are separated by an 
imperfect canal ; th$ left lip is produced, and almost 
divided by an obscure sinus into two blunt teeth. 
Presented by the Rev. G. Cookson ; it is one of the 
most elegant productions of the Ancliff Oolite. 
Figures 6 are two enlarged views. 
