PLATE 35 
Fig. la. Crepidula adunca Sowerby. X 1. Altitude 8 mm. Uni- 
versity of California Collection. Profile. 
Fig. 1b. Crepidula adunca Sowerby. X 1. Maximum diameter 
12.8 mm. View from above. 
Fig. 2. Littorina scutulata Gould. X 4%. Altitude 8 mm. 
Presidio.* 
Fig. 3. Littorina suctulata Gould. X 4%. Altitude 8.9 mm. 
Presidio.* 
Fig. 4. Littorina planaxis (Nuttall) Philippi. X 14%. Altitude 
15 mm. Bonita Point. 
Fig. 5. Crepidula convexa Say. X 1. Maximum diameter 10.5 
mm. Station D5782.* From above. 
Vig. 6. Crepidula convexa Say. X 1. Maximum diameter 11.6. 
Station D 5782.* 
Fig. 7a. Crepidula nivea Adams. X 1. Maximum diameter 21.5 
mm. Station D5810 B. View from above. 
Fig. 7b. Crepidula nivea Adams. X 1. Maximum diameter 21.5 
mm. Station D5810 B. Ventral view. 
Fig. 8. Littorina planaxis (Nuttall) Philippi. X 1%. Altitude 
13 mm. Bonita Point. 
Fig. 9. Nassa mendica Gould. X 2. Altitude 11 mm. Station 
D 5773. 
Fig. 10a. Hunaticina oldroydi Dall. X 1. Fishing Grounds West 
of the Golden Gate.* Basal view. 
Fig. 10b. Hunaticina oldroydi Dall. X 1. 
Fig. lla. Ilyanassa obsoleta (Say). X 1. Altitude 21.4 mm. 
Near Key Route Pier, Oakland.* 
Fig. lla. Ilyanassa obsoleta (Say). X 1. Altitude 21.4 mm. 
Fig. 12a. Nassa fossata (Gould). X 1. Altitude 31 mm. Sta- 
tion D 5788. 
Fig. 12b. Nassa fossata (Gould). X 1. 
Fig. 13. Nassa perpinguis Hinds. X 1%. Altitude 12 mm. 
Station D 5786. 
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