PLATE XII. 



Fig. 



1, la. Patella rugosa, j. 89, variety with large costse. 



13- magnified portion of the surface of figs. 1, la. 



lc, Id- variety with fine costae. 



1<\ magnified portion of the surface of figs, lc, Id. 



If, Iff- the young shell. 



2, 20. Patella paradoxa, p. 90. 



magnified portion of the surface. 



3, Set. Patella sulcata, p. 90. 



33. magnified portion of the surface. 



4, 40, c, d. Patella cingulata, p. 88. 



43. magnified portion of the surface. 



5, 50. Patella striatula, p. 91. 



53. magnified portion of the surface. 



6, 60. Patella Roemeri, p. 91. 



63. magnified portion of the surface. 



7, la. Patella Aubentonensis, p. 91. 



73. magnified portion of the surface. 



7c, Id. the young shell. 



8, 80. Patella arachnoidea, p. 92. 



portion of the surface magnified. 



9, 9a. Patella suprajurensis, p. 92. 



10, 100. Patella nana, p. 93. 



11, 110. Patella inornata, p. 93. 



12, Umbrella? Hamptonensis, p. 95. 



120. the surface magnified three times. 



13, 130. Deslongchampsia Eugenei, p, 94, magnified twice. 



