420 Dr. W. C. M'Intosh on the 



LIX. — On the Invertebrate Marine Fauna and Fishes of 

 St. Andrews. By W. C. M'Intosh. 



[Continued from p. 357.] 



Class GASTEROPODA. 



Order I. Cyclobeanchiata. 



Fara. Chitonidae, Guilding. 



Genus Chiton, L. 



Chiton fascicularisj L. Jeffreys, Brit. Moll. iii. p. 211, 

 V. pi. 55. f. 3. 



Abundant under stones between tide-marks. This species, 

 like tlie limpet, forms considerable cavities in sandstone, so 

 that specimens become almost immersed. 



Chiton cinereusj L. Ojp. cit. 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. 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 Ixjevis (Pennant), Mont. Op. cit. iii. p. 226, v. pi. 5Q. f. 6. 



Under stones at the verge of extreme low water during 

 spring tides. Rare ; but the examples are large. 



Order II. Pectinibranchiata. 



Fam. 1. PateUidae, 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. 



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. Icevis 

 occurs in hollows at the bases of the stems. 



