280 MUREX. ROCK-SHELL. Class VL 



From the Portland cabinet. Tab. Ixxx. 

 and Frontispiece. 



3. gracilis. Lin. Tr. viii. 143. Mont. Test. Br. 267. t. 15. 



/. 5. id. 586. 



* M. with a tapering shell; volutions ribbed and 

 striated in a decussated manner; sutures plane; 

 length seven eighths of an inch; breadth two 

 eighths. 



Discovered by Mr. Montagu on the sands of 

 Biddeford bay. 



4. ATTENU- Lin. Tr. viii. 143. Mont. Test. Br. 266. t. Q. 

 atus, f m 6. 



* M. with a slender tapering shell; the volutions 

 scarcely prominent; with nine equi-distant con- 

 spicuous ribs; length half an inch; breadth 

 one eighth of an inch. 



Discovered by Mr. Montagu in sand from 

 Falmouth harbour and at Biddeford. 



5. nebula. Lin. Tr. viii. 143. Mont. Test. Br. 267. t. 15. 



f-6. 



* M. with a tapering shell, and eight ribbed vo- 

 lutions, most delicately reticulated; tail oblique; 

 length half an inch ; inhabits the sea. Tab. 

 lxxxii. Jig. 7. 



Devonshire and south TVales coasts. 



vartous- 

 Kolored. 



