+6 Journal of Entomology and Zoology 
47. Erato columbella Mke D. White. 
48. Paphia tenerrima Cpr. Juv. Old. Det. 
49. Calliostoma. annulatum Mast. D. Det. Old. 
50. Olivella pedroana Conr. % Nat. size. S. 
1. Septifer bifurcatus Rve. Young. 
52. Mytilus californianus. Conr. Young. 
53. Dentalium semistriatum Br. and Sby. D. White. 
54. D. neohexagonum S. and P. White. 
55. Macron lividus. A. Ad. (young) Brown. Shore. 
56. Epitonium hindsii Cpr. S. White. Often found on sea anemones. E. crenatoides 
Cpr. was found in similar locations. 
Nucula castrensis Hinds. At low tide common under stones. 
Malletia faba Dall. These were dredged or found in holdfasts. 
lima dehiscens Conr. These were found in holdfasts of kelp. 
Botula (Adula) falcata Gld. This elongate rock borer was found but not so com- 
monly as the other similar species. 
Leptothyra paucicostata Dall. S. Old. Det. 
Columbella tuberosa Cpr. Old. Det. 
Marginella pyriformis Cpr. 
(Contribution from the Zoological Laloratory of Pomona College) 
