Mr. G. B. Sowerby on M. Deshayes, Ssc. 195 



Length 10 lines. Diameter of the thickening upwards of 3 lines, of 

 the opening scarcely 1| line. 



42. D. Clava, Lam. D. testd tereti, davatd, subareuatd, crassd; 

 striis transversis incequalibus ; aperturd anticd strictiore. 

 Foss. in GaUia. 



Shell thick, but less so in proportion than that of the preceding spe- 

 cies, rather strongly curved ; apex not very acute, its opening small. 

 Transverse strise irregular, unequal, more or less numerous. Opening 

 contracted, with a marginal thickening, which becomes straight and sharp 

 at its anterior edge. 



Length I inch 6 lines. Diameter of the base upwards of 3 lines, of 

 the opening nearly 2 lines. 



It is almost needless to observe to the English reader, that several 

 additional species to the above are noticed as inhabitants of our seas by 

 British writers, with whose works M. Deshayes seems to be entirely 

 unacquainted. Indeed, of the authours of this country he refers only to 

 Lister, J. Sowerby, and G. Sowerby. These species it has, however, 

 been deemed advisable to abstain from inserting, lest confusion should 

 result from the impossibihty of comparing them vdth the materials 

 employed in the present Monograph. 



Art. XX. Some ohservations on the " Account of the genus 

 Dentaliwn, by M. G. P. Deshayes," of which the foregoing 

 article is an abstract. By G. B. Sowerby, F.L.S., Sfc. 



Among the friends of science who must be reciprocally gratified by 

 indulging an opportunity of acknowledging and praising the general cor- 

 rectness and utility of the work which calls for the following observations, 

 I still cannot permit the abstract of the last article to appear in the 

 Zoological Journal v,rithout offering to the editor and conductors of that 



