MUREX. ROCK-SHELL. .95 



purple, marked by the outer-ribs ; pillar striate transversely 

 in an oblique direction, to the end of the canal : length five- 

 eighths of an inch ; breadth a quarter. 



Salcombe bay, and Dublin bay : rare. v. m. 



Variety, with a notch on the upper angle of the outer- 

 lip, like that on M. gracilis. 



19. Murex muricatus. Prickly Eock-shelL 



Montagu, pi. 9. f. 2. 



Shell strong, rough, taper, white with a reddish or 

 greenish tinge, often covered with an orange-red skin : 

 spires six or seven, swelling and deeply defined, rather 

 fattened at their tops, with about ten prominent ribs, and 

 crossed by very strong raised lines, giving it a tubercled 

 iappearance: aperture roundish, ending in a long straight 

 narrow canal, which is nearly smooth, and with the aper- 

 nlmost as long as the rest of the shell ; outer-lip 

 ad, toothed at the edge, and slightly crenate within ; 

 pillar smooth : length more than half an inch ; breadth not 

 a quarter. 



Western coasts, and Dublin bay. v. m. 



0. Murex Bamifius. Scotch Rock-shell. 

 Donovan, pi. 159. f. \ Pennant, pi. 82. f. 5. 

 Shell conic, tapering to a line point, yellowish-white : 

 piies six, swelling and rounded, with from twelve to twenty 

 raised ribs, which are sometimes spread into thin 

 longitudinal foliations, sometimes fiat and irregular, 

 ten curved towards the aperture, not striate trans- 

 y : aperture roundish, suddenly sloping at the outer 

 Kbd lower angle into a rather straight and elongated canal ; 

 the outer-lip thin : pillar rugged, with an indentation near 

 the canal : length three-quarters of an inch ; breadth more 

 than a quarter. The young shells are often rufous-brown. 

 Scotch and western coasts, Dublin bay : rare. v. m. 



1. Murex Gyrinus. Screw Hock-shell. 



Lazkeij, W*?n. Soc. i. pi. 8. f. 10. 



Shell strong, conic, short, tumid, brown : spires four, 

 regularly covered with dark chssnut turbercles, eight rows 

 on the larger volutions, including the canal, and three. 



rows 





