MOLLUSCA. 71 



Fam. 15. llactridae, Fleming. 

 G-enus 2. Mactra, L. 

 Mactra solida, L. Op. cit. ii. p. 415, v. pi. 43. f. 2. 

 Abundant on the sandy ground off the West Sands, and 

 thrown in great numbers on the beach after storms. 

 Var. elltptica is common. 



Mactra subtruncata, Da Costa. Op. cit. ii. p. 419, v. pi. 43. f. 3 . 

 Equally common with the last species, and from the same 

 ground. 



Mactra stultorum, L. Op. cit. ii. p. 422, v. pi. 43. f. 4. 

 Very abundant on the same ground as the last two species. 

 Var. cinerea is common. 



Genus 3. Lutearia, Lamarck. 

 Lutraria elliptica, Lamk. Op. cit. ii. p. 428, v. pi. 44. f. 1. 

 Common on the West Sands after storms, and in muddy 

 sand at the mouth of the river Eden. 



Genus 4. Scrobicularia, Schumacher. 



Scrobicularia prismatica, Mont. Op. cit. ii. p. 435, 

 V. pi. 45. f. 1. 



Not rare in deep water, on the West Sands after storms, 

 and in the stomachs of cod and haddocks. 



Scrobicularia alba, Muller. Op. cit. ii. p. 438, v. pi. 45. f. 3. 

 Less common than the foregoing, ft-om the same ground, 

 and in the stomachs of the same fishes. 



Scrobicularia piperata, Bellonius. Op. cit. ii. p. 444, 

 V. pi. 45. f. 5. 



Common amongst the muddy sand at the mouth of the 

 Tay, and frequently thrown on the West Sands after storms ; 

 also procured from the fishing-boats. 



