MOLLUSCA. 75 



Class GASTEROPODA. 



Order I. ("yclobranchiata. 



Fam. ChitonidsB, Guilding. 



Genus Chiton, L. 



Chiton fascicular is, 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. Oj). cii. iii. p. 218, v. pi. 55. f. 2. 

 Common in deep water, and in the stomachs of the cod, 

 haddock, and flounder. 



Chiton marginatus, Pennant. Oj). cii. 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 laevis (Pennant), Mont. Op. cit. iii. p. 226, v. pi. 56. f. 6. 

 Under stones at the verq-e of extreme low water durin» 

 spring tides. 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. 



l2 



