''SLIPPER LIMPET" OR ''BOAT SHELLS 415 



Fig. 15. — -A transverse middle section of the animal in the shell ; 

 V, viscera above the shelf, and /, the fleshy foot below. 



Fig. 16. — A small smooth-surfaced pebble on which a young 

 "Limpet" has fastened itself. 



Fig. 17. — The upper valve of a Mussel (m), whereon four " Lim- 

 pets" (l) of different sizes are piled one on the other. 



Fig. 18. — An Oyster (o) covered with barnacles, whereon (Z, I) six 

 " Limpets" varying in age are attached. 



Fig. 19. — An Oyster (o), to which a " Limpet" (l) is affixed. On 

 the surface between them a group of barnacles, serpula, &c. 



Fig. 20. — Two Oysters (o, o) (marginal view), on which are several 

 "Limpets" {I, I) of different sizes. 



Plate VII. 



Fig. 1. — A " Limpet " (Z), on which a young Oyster (o) has fixed 

 itself ; the contrary of the other specimens. 



Fig. 2. — An Oyster (o), upon which a " Limpet " (l) is attached. 



Fig. 3. — Two Oysters {o,o), held together by a "Limpet" (I). 

 Barnacle colonies on all three. 



Fig. 4. — A young Oyster (o) almost covered by a "Limpet" (I). 



Fig. 5. — An Oyster (o), to which a pile or chain (" windrow" of 

 some American naturalists) of "Limpets" {I, I, I) is aflixed. Several 

 small-sized "Limpets" are seen adhering to the Oyster, and also 

 to the larger " Limpets." 



Fig. 6. — Another view of the same specimen, whereon it can be 

 seen there are ten "Limpets " (l, I, I, I, I) fastened one above another in 

 an arched form ; their beaks all in one direction facing the observer ; 

 (o) Oyster. 



Fig. 7. — An end view of a Mussel (m) surrounded by " Limpets " 

 (1,1,1,1,1). A few small "Limpets" and some barnacles are adherent 

 to the larger "Limpets." From the lips of the Mussel there issue 

 fibres of its byssus, and these are attached to a dead Cockle-valve (co) 

 and fragments of other broken pieces of shells. 



Fig. 8. — An agglomeration of six Oysters and several " Limpets" 

 (I, I) of various sizes. 



All the figures in Plate VII. are drawn to two-thirds natural 

 scale. 



