INDEX TO ILLUSTRATIONS. 



3. Calliostoma annulatum. 



Attached to kelp. 



4. Calliostoma canalicula- 



tum. Thin ; on kelp. 



5. Trochiscus Norrissii. 



Rocks. 



6. Omphalius fusees c e n s. 



Basal view. 



7. Lept ony x sanguineus. 



Rocks. Shelly opercu- 

 lum. 



PLATE IX. 



1. Haliotis Cr ach er odii. 



Rocks. 



2. Haliotis rufescens. Rocks. 



3. Fissurella volcano. 



4. Lucapina crenulata. 



5. Crepidula adunca. Shells. 



PLATE X. 



1. Hipponyx cranioides. 



2. Scurria mitra. Roots of 



sea weeds. 



3. Nacella iucessa. Sea- 



weed. 



4. Acmsea pelta. Rocks. 



5. Acma3a persona. Rocks. 



6. Acmaea patina. Rocks. 



7. Acmsea spectrum. Shells. 



PLATE XI. 



1 . Lottia gigantea. Rocks. 



2. TornatelJa punctocselata. 



3. Ischnochiton Magdalen- 



sis. Under stones. 



4. Mopalia muscosa. 



5. Katherina tunicata. 



Rocks. 



6. Bulla nebulosa. 



PLATE XII. 



1. Placuanomia macroschis- 



ma. 



2. Pecten sequisulcatus. 



3. Pecten latiauritus. k Sea- 



weed. 



4. Hinnites giganteus Deep 



water. 



5. Lima orientalis. S e a - 



weed. 



M y t i 1 u s Californianus. 

 Rocks. 



PLATE XIII. 



1. Adula falcata. In rocks. 



2. Septifer bif urea tug. 



3. Chama pellucida. Rocks. 



4. Cardium corbis. 



5. Lucina Californica. 



6. Kellia Laperousii. Holes 



in rocks. 



7. Lazaria subquadrata. 



PLATE XIV. 



Pachydesma crassatelloi- 

 des. 



2. Saxidomus Nuttallii. 



3. Tapes staminea Gravel. 



4. Rupellaria lamellifera. 



5. Amiantis callosa. 



PLATE XV. 



1. Tellina Bodegensis. 



2. Macoma i nconspi c ua. 



Sand. 



3. Macoma nasuta. Mud. 



4. Psammobia rubroradiata. 



5. Donax Californicus. 



6. Machaera patula. 



PLATE XVI. 



1. Solerurtus Californicus. 



Mud. 



2. Platyodon cancella t u s. 



3. Pholadidea penita. In 



rocks. 



4. Zirphoea crispata. Hard 



clay. 



5. Parapholas Californica. 



In rocks. 



