EXPLANATION OF PLATE V2. 



Fig. 1. — Solen stantoni, n. sp. Nat. size. 



Fig. 2. — Modiola merriami, n. sp. Nat. size. 



Fig. 3. — Tellina martinesensis, n. sp. Xiy L >- 



Fig. 4. — 4rca bilolxi, n. sp. Nat. size. 



Fig. 5. — Thracia Tcarquinesensis, n. sp. Nat. size. 



Fig. 6. — Phaladomya nasuta Gabb. Nat. size. 



Fig. 7. — Architectonica tuberculata, n. sp. X2. 



Fig. 7o. — Upper side of body whorl of specimen shown in fig. 7. X5. 



Fig. 8. — Xenopliora sitteli, n. sp. X %. 



Fig. 9. — Discohelix calif ornicus, n. sp. Nat. size. 



