STROMBUS. MUREX. 33 



" Stromhus contains forty-four species. Shell 

 univalve, spiral, aperture much dilated, the lip 

 expanding, ending in a canal inclining towards 

 the left. 



" You must notice the sinus in the outer lip, 

 near the base of the shell. Stroinhus fjlgas, the 

 West Indian conch, is very large. Some species 

 have the lip ending in claws. Stromhus pes-peli- 

 ccDii^ the pelican's-foot, has four palmated claws : 

 (Plate 70 it is a British shell. The city of 

 Santa Cruz, in America, is paved with the shells 

 of Stromhus glgas. 



" The genus Murex is both large and beauti- 

 ful. Shell univalve, spiral ; aperture oval, end- 

 ing in a straight canal. 



" These shells are of very unequal form ; their 

 surfaces frequently covered with spines, knobs, 

 or foliations. Some are remarkable for the great 

 length of the beak, (Frontispiece,) such as the 

 woodcock, the snipe's-head, and Yenus's-comb. 

 The Murex before you is foliated. (Plate 7-) 

 The species are one hundred and seventy-one. 

 Several are found on British coasts, but they are 

 not remarkable for beauty. 



'^ The top-shell, Trochus, is univalve, conic, 

 spiral ; the aperture either angular or rounded ; 

 columella oblique : some of the apertures have a 

 tooth-like projection. (Plate 7) Species, one 

 hundred and thirty. Several kinds occur in 



c 5 



