76 
MARINE FAUNA OF ST. ANDREWS. 
Genus 2. Helcion, De Montfort. 
Helcion pellucidum , L. Op. cit. iii. p. 242, v. pi. 58. f. 1 & 2. 
Abundant on the blades of the tangles; while var. leevis 
occurs in hollows at the bases of the stems. 
Genus 3. Tectura, Cuvier. 
Tectura testudinalis , Muller. Op. cit. iii. p. 246, v. pi. 58. f. 3. 
Common under stones near low-water mark. 
Tectura virginea , Muller. Op. cit. iii. p. 248, v. pi. 58. f. 4. 
Under stones near low-water mark; nearly as common as 
the foregoing. 
Tectura fulva, Muller. Op. cit. iii. p. 250, v. pi. 58. f. 5. 
A single specimen on the West Sands after a storm. 
Fam. 2. Fissurellidse, Fleming. 
Genus 2. Emarginula, Lamarck. 
Emarginula Jissura, L. Op. cit. iii. p. 259, v. pi. 59. f. 2. 
Not uncommon in deep water; and worn specimens amongst 
the shell-debris on sands. 
Fam. 3. Capulidse, Fleming. 
Genus Capulus, De Montfort. 
Capulus ungaricus , L. Op. cit. iii. p. 269, v. pi. 59. f. 6. 
Frequent in deep water, and often brought in by the fishing- 
boats. 
Fam. 7. Trochidae, D’Orbigny. 
Genus 2. Trochus, Rondeletius. 
Trochus tumidus , Mont. Op. cit. iii. p. 307, v. pi. 62. f. 2. 
Common on hard ground in the bay, in the stomach of the 
cod and haddock, and on the West Sands after storms. 
