SHELLS, ETC., ON ARDEEE AND IRVINE BEACHES. 247 



Donax vittatus, Da Costa. - Frequent. 

 Mactra subtruncata, Da Costa.— Abundant. 



stultorum, Linn.— Frequent. 

 Lutraria elliptica. Lam.— Frequent. 

 Scrobicularia piperita, Bellonius.— Scarce. 

 iSolen ensis, Linn.— Common. 



siliqua, Linn.— Common. 

 Thracia papyracea, Poli.— Scarce. 

 Mya arenaria, Linn.— Frequent ; shells only. 



truncafa, Linn.— Rare ; shells only. 

 Saxicava rugosa, Linn.-Common amongst the roots 



of Laminaria, in holes in stones, 

 and on timber. 

 Pholas crispata, Linn.— Rare. 

 Xylophaga dorsalis, Turton.-Frequent in pieces of 



wood and timber. 

 rerec?o. -Several species in pieces of timber. 

 Patella vulgata, Linn.— Common. 

 Tectura virginea, Miill.— Rare. 



Helcion pellucidum, Linn.— Frequent in cavities 



which it has eaten in the 

 lower part of the stem of 

 Laminaria digitata. 

 Puncturella Noachina, Linn.— Rare. 

 Emarginula fissura, Linn.— Rare. 

 Trochus magics, Linn-Frequent, but never with 



animal. 

 tuinidus, Montagu. -Frequent. 

 cinerarius, Linn.— Frequent. 

 umhilicatus, Mont.— Frequent. 

 zizyphinus, Linn.— Scarce. 

 Lacuna divaricata, Fabr.— Scarce. 



pallidula. Da Costa.— Scarce, 

 sp.— Worn specimens. 

 Littorina obtusata, Linn. Common. 

 littorea, Linn.— Common. 

 rudis, Maton.— Frequent. 

 Rissoa parva. Da Costa.— Frequent. 



var. interrupta. Ad.— Frequent 

 Homalogyra atomus, Phil.— Scarce, 



