30 



NERITA aperta. 



TAB. CCCCXXIV.— /-. 2, 3 and 4. 



Spec. Char. Sub-hemisphaerical, smooth; 

 spire visible, depressed ; aperture orbicular, 

 expanded; inner lip obscurely crenated, 

 bearing one large tooth. 



A THicKENiNo of the outer lip a little within its sharp 

 edge, together with its general form not being produced 

 in the middle as in many Neritinae, seem to warrant the 

 placing this as a Nerita. In most specimens the surface is 

 marked with acutely zigzag brown lines of width equal 

 with the white between them : but one individual has a 

 black ground, with oval white spots. (See fig. 4.) 



Professor Sedgwick discovered this in Colwell Bay, 

 on the Isle of Wight ; from his specimens we have taken 

 figures 3 and 4, while fig. 2 is from a Barton example that 

 we have just received from our kind friend Miss Salisbury. 

 The Isle of Wight specimens are often much corroded. 



