OF CONCHOLOGY. 09 



six furrows, which frequently widen 

 towards the top, and terminate 

 in angulated points, sometimes as 

 wide as at the base ; compartments 

 sulcated, or sometimes striated longi- 

 tudinally ; of a yellowish colour ; oper- 

 culum consisting of four rough, an- 

 gulated, erect valves. 



Linn. Trans, vol. viii. page 25. 



A operculum, B the base, i^jP ridges 

 or furrows, Ho. stone to which the 

 base of the shell is affixed. 



Fig. 2nd.— LEPAS ANATf FERA. 

 Shell compressed, with five obsoletely 

 striated valves ; the lower valves some- 

 what triangular; the superior ones 

 long, and tapering to an obtuse point. 

 The valves connected by a cartilage, 

 of a reddish colour, and affixed to a 

 peduncle of a colour between Ver- 

 million and orange. 



This shell is generally affixed to 

 pieces of rotten wood and to the bot- 

 toms of vessels, and is found in almost 



