SMART AND COOKE : MARINE SHELLS OF SCILLY. 295 



Fissurella Grceca Don. — With the above, but never alive. 

 Capulus Hungaricus L. — Very young and dead specimens 



only ; with the above. 

 Trochus magus L. — Common in dirty sand, at low water 



mark, in all the bays and flats. The var. alba also occurs. 



• T. turn id US Mont. — Common from the Menavawr dredgings. 

 T. cinerarius L. — Abundant under stones and sea weeds 



everywhere. 

 T. umbi Meatus Mont. — With the above, often very clean and 



finely marked. 

 T. lineatus Da Costa. — Very common at half-tide mark all 



round the shores. Eaten as ' Wrinkles ' by the inhabitants. 



T. montacuti Wood. — With T. tumidus, but not nearly so 

 common. 



T. striatus L.— Swarming on all the Zostera beds. 



T. millegranus Phil. — One specimen only, with the follow- 

 ing variety. 



T. millegranus var. pyramidata Phil. — Rather common- 

 from the Menavawr dredgings ; colour pure white, a very 

 pretty shell, occurring with a white var. oizizyphinus, from 

 which it is distinguished at once by its granulated surface. 



T. granulatus Born. — A few dead and imperfect specimens 

 only, from the Menavawr dredgings. 



T. zizyphinus L. — Under stones at low water mark every- 

 where, but not very common. 



T. zizyphinus var. Lyonsii L. — Golden Ball Bar, under 

 stones and in rock pools overhung by rocks, abundant, but 

 never to be found without dislodging many loose stones, 

 or peering under massive ledges of rock ; also dredged with 

 T. ?jiillegranus var. pyramidata outside Menavawr but never 

 so large as shore specimens. 



Another variety occurred on Golden Ball Bar in which 

 the markings of the type form were uniformly lighter, without 

 a trace of purple. 



