[ 138 3 

 many others. The Spines of the Purpuric 

 differ, being more or lefs lharp, and in 

 Number various ; both this Kind and the 

 Murex are found in great Plenty in the 

 Gulph of Tarentum. 



Bolia^ Tun Shells. Thefe have a glo- 

 bofe or round Belly, a lax Aperture or 

 Mouth, fometimcs fmooth, at others den- 

 tated ; the Clavicle is either very little 

 umbonated or depreffed ; the Columella 

 in fome Species fmooth, in others wrink-p- 

 led \ and the outward Surface is always 

 yarioufiy fulcated^ therein differing fronj 

 the Bulla. Among the Specimens, thofc 

 moft worthy Notice are the Ethiopian 

 Crown, the feveral Kinds of Harp Shells, 

 the variegated ribbed Tun Shell, fome 

 Perfian Shells, and many others, which it 

 would take up too much Room particu- 

 larly to mention. 



Bulla^ Boat Shells, are a Kind of Dolia^ 

 but differ from them in that their Surface 

 is fmooth, whereas the Dolia are always 

 fulcated j the fpiral Volutions of this Shell 



in 



