51 



P0TAMIDE8 ? margaritaceiis. 

 TAB. CCCXXXIX.— F/o^. 4. 



"^ 



SrEc. Char. Conical, turreled ; five close rows of 

 bead-like granules surround each whorl, the first 

 and fourth row minute, and the fifth larger than the 

 other two ; lip ex])anded, plicated ; columella re- 

 curved, obtusely carinated. 



Syn. Murex margaritaceus. Brocchi 447, t. 9./. 4, 



1 HE granulated surface has a very rough aspect ; the 

 spire is rather shorter in proportion than many of the 

 genus ; the largest row of granules is placed near the 

 upper edge of each whorl, but is not sufficiently distinct 

 to merit the title of a corona ; the lip is thickened and a 

 little expanded, it has two or three furrows within its 

 upper part, and resembles much that of the recent 

 P. muricatus. 



Brought from the upper marine formation of the Isle 

 of Wight by Professor Sedgwick. It is unquestionably 

 the shell described by Brocchi. 



POTAMIDES ? cinctus. 

 TAB. CCCXL.— Fig. i. 



Spec. Char. Subulato-conical, with three rows of 

 nearly equal granules upon each whorl, and two 

 carinae near the edge of the base ; suture subcana- 

 liculated ; columella with one plait. 



Syn. Cerithiam cinctum. Lamarck Env. de Paris 81. 



A LuNGEii shell than the last, and not so rigid in i 

 aspect ; it has a ilatish base, and a thin but eulari-ed 



ts 



