EXPLANATION OF PLATE 19 

 All figures approximately natural size. 



Fig. la. Purpura nanna, n. sp. Back view of type specimen no. 11315; from 

 U. C. locality 2279; Santa Margarita. 



Fig. 16. Purpura nanna, n. sp. Mouth view of same specimen as figure la. 



Fig. 2. Turritella freya, n. sp. Upright view of type specimen, Univ. Calif. 

 Coll. Invert. Palae. no. 11313. Characteristic of the Santa Margarita. 



Fig. 3a. Acantldna (Monoccras) noma, n. sp. Mouth view of an excellently 

 preserved specimen; type specimen no. 11314; U. C. locality 2276; Santa Mar- 

 garita. 



Fig. 36. Acanthina (Monoccras) noma, n. sp. Back view of same specimen 

 as figure 3 a. 



Fig. 4. Pectcn crassicardo biformatus, n. var. Profile of type specimen. 



Fig. 5. Septifer margaritana, n. sp. Exterior of right valve of type no. 

 11310; U. C. locality 2276; Santa Margarita. 



Fig. 6. Periploma clarlii, n. sp. Left valve of imperfect type specimen no. 

 11320; from U. C. locality 2278; Santa Margarita. 



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