289 



11. 



Ti'ocl'.us fufcus. Tar/. Zz«. iv. p. 471 » FuscuJ. 



Adams Mkr of c. t. 14. f. 24. 

 Trochus urabilicatus quinque anfraflibus marginatus apertura 

 fubrotunda. Walk. Min. Shells, f. 5S. 



The five-fpired, umbilicated, marginated top (liell, with 

 a roundifli aperture. 



The colour opaque-brown. From Sandwich; common. 



Not being acquainted with this fpecies, we have been 

 obliged to copy Mr. Walker's defcription. The figure 

 given is about the fize of our T. tumidus ; poffibly a va- 

 riety of that fpecies, unlefs a fraall figure was forgot to be 



given. 



12. 



Trochus ciuereus. Da Cofta, p. 42. t. Hi. f. 5. 5. Cinereus. 



This fpecies, which Da Costa fpeaks of as common 

 in Sujfex, EJfex, Corntvall, CheJIiire, Northumberland, and 

 in the Orknies, we have never been fortunate enough to 

 identify ; poffibly it is only a variety either of the T. cine- 

 rarius, or T. umbilicatus, 



Doflor PuLTENEY confidcred it as a variety of the for- 

 mer; but, notvvithftanding, we think it right to give it a 

 feparate place, on account of fome charafters which muft 

 create a doubt of its beinsr cither of thofe fhells. 



o 



It is thus defcribed: "The fliell is thick and flrong, of 



P p the 



