INDEX TO ILLUSTRATIONS. 



Plate I. 



1. Purpura crispata. The 



parts of a univalve 

 shell. 



2. Tapes tenerrima. The in- 



terior of the left valve, 

 showing the parts of the 

 shell. 



Plate II. 



1. Pteronotus festivus. On 



rocks. 



2. Ranella Californica. 



3. Chrysodomus dirus. Mos- 



sy rocks. 



4. Purpura saxicola. Rocks 



between tides. 



5. P u r para canaliculata. 



Deeper water. 



6. Purpura crispata. Rocks. 



Plate III. 



1. Monoceros lapilloides. 



Surface of rocks. 



2. Chorus Belcheri. Very 



large. Southern. 



3. Monoceros engonatum. 



Rocks. 



4. A m p h i s s a corrugata. 



Dead, on beach. 



5. Amycla carinata. 



6. Cerostoma foliatum. 



Rocks ; rare. 

 Plate IV. 



1. Cerostoma Nuttallii. 



2. Nassa fossata. 



3. Nassa perpinguis. 



4. Nassa mendica. 



5. Nassa Cooperi. 



6. Olivella biplicata. Bur- 



rowing in sand. 



7. Olivella baetica. 



Plate V. 



1. Conus Californicus. 



2. Drillia torosa. Beach. 



3. Drillia penicillata. South- 



ern. 



4. Luponia spadicea. 



5. Trivia Californica. Beach. 

 G. Erato vitellina. Beach. 

 7. Erato col umbel la. 



Plate VI. 



1. Lunatia Lewisii. Sandy 



beaches. 



2. Cerithidea sacrata. Mud 



of salt marshes. 



3. Bittium filosum. Sand, 



4. Scalaria crebricostata. 



5. Opalia borealis. 



6. Littor ina planaxis. 



Rocks. 



7. Littorina scutulata. 



Abundant on rocks. 

 Plate VII. 



1. Lacuna uni fascial a. 



Rocks and sand. 



2. Phachypoma gibberosum. 



Dead, on beach. 



3. Phasianella compta. 



Sand. Very rich color- 

 ing on shell. 



4. Pomaulax u n d o s u s . 



Ribbed operculum. 



5. Chlorostoma fun ebrale. 



Very abundant on rocks. 



6. Chlorostoma brunneum. 



Kelp. 



Plate VIII. 



1. Cholorostoma aureotinc- 



tum. Rocks. 



2. Calliostoma costatum. 



Low water. 



