Plate 18 

 PACIFIC COAST UNIVALVES 



a. KEYHOLE LIMPET, Megathura crenu- 



lata Sby., 4 inches (Monterey, Califor- 

 nia, south), p. 99. 



b. ROUGH KEYHOLE LIMPET, Diodora 



aspera Esch., 2 inches (Alaska to Lower 

 California), p. 97. 



c. VOLCANO SHELL, Fissurella volcano 



Reeve, 1 inch (Crescent City, California, 

 south), p. 100. 



d. TWO-SPOTTED KEYHOLE LIMPET, 



Megatebennus hiniacidatus Dall, '^2 

 inch (entire coast), p. 99. 



e. HARD-EDGED KEYHOLE LIMPET, 



Liicapiriella callomargijiata Dall, 1 inch 

 (California, south), p. 99. 



f. FINGERED LIMPET, Acmaea digitalis 



Esch., 1 inch (Alaska to Mexico), p. 103. 



g. TEST'S LIMPET, Acmaea conus Test, % 



inch (California to Lower California), 

 p. 102. 



h. WESTERN BANDED TEGULA, Tegula 

 ligidata Menkc, % inch (Monterey, 

 California, south), p. 120. 



i. CARPENTER'S DWARF TURBAN, Ho- 



malopoma carpenteri Pils., ^/;j inch 

 (entire coast), p. 126. 



j. GIANT OWL SHELL, Lottia gigantea 

 Gray, 3 inches (Crescent City, Califor- 

 nia, south), p. 101. 



k. GILDED TEGULA, Tegula anreotincta 

 Forbes, 1 inch (Southern California, 

 south), p. 120. 



1. ROUGH LIMPET, Acmaea scabra Gould, 

 1 inch (Washington to Lower Califor- 

 nia), p. 103. 



m. NORRIS SHELL, Norrisia norrisi Sby., V/j 

 inches (Monterey, California, south), 

 p. 117. 



n. SHIELD LIMPET, Acmaea pelta Esch., 

 13^2 inches (Alaska to Lower Califor- 

 nia), p. 102. 



o. FILE LIMPET, Acmaea limatula Cpr., 1 V^ 



inches (Northern California, south), 



p. 102. 

 p. WAVY TURBAN, Astraea nndosa Wood, 



3 inches (Ventura, California, south), 



p. 124. 



q. MASK LIMPET, Acmaea persona Esch., 

 Ij,^ inches (Alaska to Monterey, Cali- 

 fornia), p. 103. 



r. WHITE CAP LIMPET, Acmaea mitra 

 Esch., 1 inch (Alaska to off Lower Cali- 

 fornia), p. 101. 



s. GRANULOSE TOP-SHELL, Calliostoma 

 snpragranosum Cpr., 3^2 inch (Monterey 

 California, south), p. 115. 



t. FENESTRATE LIMPET, Acmaea fenes- 

 trata Reeve, 1 inch (California, south), 

 p. 102. 



u. CALIFORNIAN LIOTIA, Liotia fenes- 

 trata Cpr., % inch (Monterey, Califor- 

 nia, south), p. 122. 



V. SPECKLED TEGULA, Tegula gallina 

 Forbes, 1 inch (San Francisco, Califor- 

 nia, south), p. 119. 



w. CRIBRARIA LIMPET, Acmaea fenestrata 

 cribraria Gould, 1 inch (Alaska to Ca- 

 lifornia), p. 102. 



X. MONTEREY TEGULA, Tegula moulereyi 

 Kiener, Ij^ inches (California), p. 121. 



y. DUSKY TEGULA, Tegula pulligo Gmelin, 

 1 inch (Alaska to California), p. 120. 



z. SEAWEED LIMPET. Ac7naea insessa 

 Hinds, ^4 inch (Alaska to Lower Cali- 

 fornia), p. 105. 



z.z. UNSTABLE LIMPET, Acmaea insiabilis 

 Gould, 1 inch (Alaska to San Diego, 

 California), p. 105. 



