EXPLANATION OF PLATE 8 



Fig. la. AcantJiina perrini, n. sp. X 1. Type in Stanford University Pale- 

 ontologieal Collection. 



Fig. lb. Acanthina perrini, n. sp. X 1. Type. 



Fig. 2. Koilopleura sinuata (Gabb). X 1. Specimen figured is No. 11901, 

 Univ. Calif. Mus. Pal. Briones. 



Fig. 3rt. Koilopleura sinuata (Gabb). X 1. Genotype. — No. 11900, Univ. 

 Calif. Mus. Pal., loc. 1354. Briones. 



Fig. 3b. Koliopleura sinuata (Gabb). X 1. This shows the narrow depres- 

 sion on lower part of body whorl and the spine on the outer lip. Genotype. 



Fig. 4a. Koilopleura sinuata (Gabb). X 1. Cotype of genus. — No. 12393, 

 Univ. Calif. Mus. Pal., loc. 1455. Briones. 



Fig. 4b. Koilopleura sinuata (Gabb). X 1. Cotype of genus. 



Fig. 5a. Oliva simondsi, n. sp. X 1. Type.— No. 12394, Univ. Calif. Mus. 

 Pal., loc. 171. Briones. 



Fig 5b. Oliva simondsi, n. sp. XI. Type. 



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