53 



tained from the Veronese territory. From this place I also obtained 

 the fossil shell, Plate V. Fig. 1, which very nearly accords with C. Strom- 

 boides, Lam. being subfusiform and transversely striated, with a nodular 

 spire : the nodules, however, appearing to be more projecting, and 

 turns of the spire more acute, than in the shell described by La- 

 marck. 



IX. Cypr&a. An ovate convex univalve, with the margins involuted; 

 spire small, and nearly covered over ; the opening long, narrow, and 

 toothed on both sides. 



When we consider that the markings of the recent shell of the genus 

 Cypraa frequently determine the species, and that these markings are 

 lost in the mineralization of the shell ; and when it is also considered, 

 that even the forms of the shells are considerably different, at different 

 periods of their growth, we must see how difficult it will often be to 

 determine whether any specific analogy exist, or not, between the 

 recent and the fossil shell. 



Lamarck describes three fossil species : C. pediculus, C. inflata, and 

 C. Sulcosa, as being found at Grignon. 



I have found several of this genus in the Essex cliff, which I am dis- 

 posed to refer to C. pediculus. The striae must, however, be acknow- 

 ledged to be finer and closer than in the recent shell. They are per- 

 haps nearer allied to C. Costata, Linn. 



The sulcated specimen, Plate V. Fig. 24, from Verona, appears to 

 merit, from its size, the being considered as a species distinct from any 

 at present known. Other species, with a smooth surface, are also 

 obtained from the Veronese territory. 



X. Ovula. A tumid univalve, more or less elongated in a point, at 

 the ends; the edges involuted, and the opening longitudinal, and without 

 teeth on the left side. 



Bruguiere separated from the genus Bulla, of Linnaeus, the Bulla 

 ovum, volva, &c. those shells which, having their edges rolled inwards, 



