TECTURA. 24'j 



chainwork : beak rather sharp, placed near the anterior end, 

 which it sometimes overhangs : mouth usually more round 

 than oval, but variable in this respect: margin even and 

 smooth : inside highly polished, porcelain-white or pinkish, 

 and frequently exhibiting in tlie young near the crown two 

 of the outside rays, which are darker than the others and 

 assume the shape of a reversed V ; margin rather broad, and 

 bevelled to a sharp edge : paUial scar marked on the inner 

 line with a row of several white dots, that probably corre- 

 spond with the fringe of cirri on the mantle. L. 0*4. B. 0-3. 



Yar. 1. conica. Shell much smaller, more conical, and higher, 

 with the crown nearly central. 



Yar. 2. lactea. Shell milk-white. 



Habitat : Common on shells and stones in the lami- 

 narian zone, and occasionally at low water, throughout 

 the British Isles. Var. 1. occurs in deeper water. Yar. 2. 

 Scarborough (Bean). Fossil in the Scotch and Irish 

 newer pliocene beds (J. Smith, Forbes, Janiieson, 

 Crosskey, and J. G. J.) ; Uddevalla (Malm) ; Chris- 

 tiania, 120-200 ft. (Sars) ; Calabria and Tarento 

 (Philippi) ; Red Crag (S. Wood). It is found living in 

 every part of the North Atlantic, from Iceland (Torell) 

 to the Canary Isles (M f Andrew) and Azores (Drouet), 

 as well as on both sides of the Mediterranean, and in 

 the iEgean (Forbes) ; perhaps also at Sitka Island as 

 Patella pileolus or P. Asmi of Middendorff. The range 

 of depth varies in these foreign localities from 3 to 60 f. 



Specimens taken by Mr. Jordan on the shore at 

 Guernsey are larger and thicker than any other which 

 I have seen ; their diameter exceeds half an inch. The 

 apex of the fry is white, and has an incomplete 

 whorl. 



The little pink-rayed limpet ;has had many hard 

 names given to it, besides those of Middendorff. It is 

 the Patella minima of Gmelin (from Schroter), P. parva 

 of Da Costa, P. cequalis of J. Sowerby, Ancylus Gussonii 



M 5 



