MOLLUSCA. 
75 
Class GASTEROPODA. 
Order I. Cyclobranchiata. 
Fam. Chitonidae, Guilding. 
Genus Chiton, L. 
Chiton fascicularis , L. Jeffreys, Brit. Moll. iii. p. 211, 
v. pi. 55. f. 3. 
Abundant under stones between tide-marks. This species, 
like the limpet, forms considerable cavities in sandstone, so 
that specimens become almost immersed. 
Chiton cinereus , L. Op. cit. iii. p. 218, v. pi. 55. f. 2. 
Common in deep water, and in the stomachs of the cod, 
haddock, and flounder. 
Chiton margmatus , Pennant. Op. cit. iii. p. 221, v. pi. 56. f. 5. 
Frequent under stones between tide-marks. 
Chiton ruber , Lowe. Op. cit. iii. p. 224, v. pi. 56. f. 4. 
Occasionally between tide-marks at the East Rocks. 
Chiton Icevis (Pennant), Mont. Op. cit. iii. p. 226, v. pi. 56. f. 6. 
Under stones at the verge of extreme low water during 
springtides. Rare; but the examples are large. 
Order II. Pectinibranchiata. 
Fam. 1. Patellidae, Guilding. 
Genus 1. Patella, Lister. 
Patella vulgata , L., and var. depressa. Op. cit. iii. p. 236, 
v. pi. 57. 
Common everywhere; occasionally eaten. The soft shale 
and sandstone are extensively pitted by this form. 
L 2 
