Molluscoida of St. Andrews. 307 



Genus Flustrella, Gray. 

 FlustreUa hispida. Fab. ; Johnst. Brit. Zooph. p. 303, 



pi. m. f. 5. 



Abundant on tlie stems of Fuci and other seaweeds, and on 

 stones between tide-marks. 



Genus Lepralia, Johnst. 



Lepralia Brongniartii, And. ; Busk, Catal. p. 65, 

 pi. 81. f. 1-5. 



Rather plentiful on laminarian roots thrown on shore after 

 storms. Often forms a basis for other growths, and may be 

 seen on their under surface when detached from seaweed or 

 rock. 



Lepralia reticulata^ J. Macgilli-vTay ; Busk, Catal. p. 66, 

 pi. 90. f. 1, pi. 93. f. 1 & 2, pi. 102. f. 1. 



Not uncommon in the siphons and inside the mouth of 

 Fxisus antiquuSf and also on Cardium echinatum from deep 

 water. 



Lepralia concinna, Busk, Catal. p. 67, pi. 99. 



Yeiy abundant on stones and shells from the coralline 

 ground. A well-marked variety, with perforations roimd the 

 cells, is not uncommon. 



Lepralia verrucosa^ Esper ; Busk, Catal. p. 68, pi. 87. f. 3 & 4, 



pi. 94. f. 6. 



Occurs rather abundantly on the roots of Laminaria digitata 

 and on stones near low-water mark. 



Lepralia unicornis^ Johnst. ; Brit. Zooph. p. 320, pi. 57. f. 1. 

 A common littoral species, everywhere abundant, and in 

 large patches on the imder surface of stones. The colours 

 vary, probably in some cases from the ova. 



Lepralia spinifera^ Johnst. ; Busk, Catal. p. 69, pi. 76. f. 2 & 3. 



Very common on the under surface of stones near low- 

 water mark. 



Lepralia trispinosa, Johnst. ; Busk, Catal. p. 70, 

 pi. 85. f. 1 & 2, pi. 98, pi. 102. f. 2. 

 Abundant on stones and shells from the coralline zone. 



