KliVHOLE LIMPET. FissureU.a maxima. 



1UF-AND-SADCKR LIMPET.-Ca^ptrtm rudis. (Empty shell below.) HUNGARIAN BONNET LIMPET.-Piieopsw Uiyaricu* 

 LADY'S BONNET. Calyptraw cqvestrls. DUCK-BILL LIMPET. Parmtphorus austrdlis. Empty shell on the left. 



shell, while in others it is a long and curiously shaped aperture, very like the keyhole of 

 a lock. The aperture increases with the shell, being hardly perceptible when the animal 

 is young, but encroaching rapidly until it removes the whole of the sharp apex. These 

 animals are mostly found at the same depth with the great tang seaweeds, but are some- 

 times to be taken in fifty fathoms of water. The genus Fissurella is a large one, 

 comprising about one hundred and twenty species. 



THE curious DUCK-BILL LIMPET inhabits the hotter seas, and is found on the shores 

 of New Zealand, the Eed Sea, and the Cape. It belongs to a small genus, containing 

 about ten species. 



This shell derives its name from its peculiar shape, which certainly does bear some 

 distant resemblance to the beak of a duck. The animal is of very great comparative 

 dimensions, and while living covers the shell with its mantle. Its colour is black, and 

 its sides are edged with short fringes. The eyes are set on the outer bases of the tentacles 

 The colour of the shell is very pale yellow. 



A NUMBER of nearly allied shells, belonging to the same family as the preceding species 

 are called CUP-AND-SAUCEE LIMPETS, from the peculiar cup-shaped process on the interior, 

 the shell itself taking the place of the saucer. This process forms the base, to which are 

 attached the muscles which draw the animal to the rock. None of these Limpets appeal 

 to be active, seldom quitting the spot on which they have settled themselves in their 

 infancy. The form of the shell is extremely variable, depending greatly on the substances 

 to whicli it adheres, and the colour seems to be quite as mutable as the form . A specimen 

 in my possession has an exceedingly thick shell, with very deep ridges, and a boldly 

 waved edge. Its colour is brown, of various shades, diversified with a little ochreous 

 yellow. The " cup " is very much lighter than the interior of the shell, and is of a greyish 

 white with a slight yellow tinge, and marked with wavy streaks that give it a singular 



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