414 THE ZOOLOGIST. 



between the Chapman Light and Holehaven. This is but another 

 link in the evidence of Crepidula fornicata retaining its native 

 choice of objects to settle on in its new British home. 



DESCRIPTION OF PLATES. 

 Plate VI. 



Fig. 1. — On the left {a) is a bunch of the capsules and a few 

 extruded eggs, as seen by us among specimens in early and mid- July. 

 On the right (b) are some of the more elongated spat (" veligers"), 

 carried within the shell in Thames live specimens gathered in 

 October. 



Fig. 2. — Dorsal view of three of the shells grading from smaller 

 to larger size. 



Fig. 3. — Interior of shell of a bigger animal, showing the shelf or 

 horizontal nacreous plate. 



Figs. 4 and 5. — Exterior top view of larger shells. On fig. 4 at 

 the apex a little younger " Slipper Limpet " has become attached. 



Fig. 6. — A group of three of the " Limpets," as affixed to each 

 other, varying in size. 



Figs. 7 and 8. — Interior of the shells of older and larger animals ; 

 s, the nacreous shelf, comes half-way down the shell. The colouring 

 of the latter varies considerably. 



Figs. 9 and 10. — Exterior lateral surface of two full-grown shells 

 of C. fornicata ; be, spiral or slightly twisted beak. 



Fig. 11. — View of lower surface, with the animal itself in place ; 

 /, sucker-foot {mesopodium or sole of Conklin), slightly contracted. 

 Its thinner flexible extension downwards in figure (so-called pro- 

 podium) has beyond it the horns and mouth-lobes. 



Fig. 12. — A top view, in which a portion of the shell has been 

 removed, exposing the mantle covering the visceral structures of the 

 animal ; m, the mantle ; g, the gills. On opposite side, viscera, con- 

 torted blood-vessels, turn of gut, &c. 



All the figures from 2 to 12 inclusive are drawn to natural size. 



Fig. 13. — A vertical, median, longitudinal section of a dried shell, 

 wherein s represents the horizontal shelf, and be, outside of beak. 



This and the succeeding figures in this plate are two-thirds their 

 natural size. 



Fig. 14. — A similar section, with the fleshy parts of the animal 

 i7i situ ; s, the shelf ; v, the viscera above it ; and /, muscular foot 

 below. 



