Uev. M.J. Berkeley on Jssimini<ihs rolntndtnticiildta. 4'27 



by Cuvier, being one of the rare instances in which a calcareous tube 

 occurs in that genus. 



For the other, Serpula Filograna, I beg leave to propose a new genus 

 which will be characterised by the nature of its opercula and number of 

 branchiee, and may be called Filograna ; in which case, Turton's specific 

 name implcxa will be very appropriate. 



Filograna, nob. 



Shell very slender, filiform, gregarious. 



BranchicB 8, filiform, of which two bear an infundibuliform obliquely 

 truncate operculum. 

 Mantle rectangular. 

 Fascicles of bristles 7 on each side. 



Reference to the Figures. 



Plate XIX. 



Fig. 2. Ditriipa suhnlata. 

 a. The animal. 

 h. One of the branchiae. 



c. A portion of the anterior part of the mantle. 



d. Operculum, 



Art. LVill. Description of the Animals of Valuta denli- 

 culnta, Munt. and Asslminia Gray ana. Leach. By 

 the Rev. M. J. Bkrkklev, A. M. 



Voluta denticulnta, Mont. [Carychium Myosotis, Michaud, Corapl. de 

 I'Histoire de Draparn.) and Assiminia Grayana, Leach, abound under 

 stones in the salt marshes by the Thames at Gravesend. Having an 

 opportunity of examining both in a living state in the summer of 1832, 



