160 american journal 



Plate 14. 



1. Operculum of Nitidella cribraria, Lin.. 



2. " Amphissa versicolor, Dall. 



3. " Astyris carinata, Hinds. 



4. " Volutharpa ampullacea, Midd. ; a, first nu- 



cleus. 



5. " Nitidella G-ouldii, Cpr. 



6. Rictocyma mirabilis, Dall. ; greatly enlarged. 



7. Lioeyma Beckii, Dall. ; nat. size. 



8. " viridis, Dall. ; nat. size. 



9. " Scammoni, Dall. ; nat. size. 



10. Semele rubropicta, Dall. ; nat. size. 



11. Siliqua media, Gray ; nat. size. 



12. Turtonia occidentalis, Dall. 



13. Modiola aterrima, Dall. 



Plate 15. 



1. Buccinum Kennicottii, Dall. 



2 — 3. Lamellaria Stearnsii, var. orbiculata, Dall. 



4 — 5. " rhombiea, Dall. 



6. " Stearyisii, Dall. 



7. Fissurellidea bimaeulata, Dall. 



8. " Ohypidella" eallomarginata, Cpr. 



9. Clathurella Canfieldi, Dall. 



10. LepAothyra paucicostata, Dall. 



11. Tornatina harpa, Dall. 



12. Rictaxis punctoeoelata, Cpr. 



13. Astyris aurantiaca, Dall. 



14. Calliostoma affinis, Dall. 



15. " Palmeri, Dall. 



16. Amauropsis purpurea, Dall. 



17. Persicula dubiosa, Dall. 



Plate 16. 



1. Mercenaria Kennicottii, Dall. ; nat. size. 



2. Drillia Kennicottii, Dall. 



3. Entodesma Scammoni, Dall. 



4. Pecten alaskensis, Dall. 



5. Hinge of Ceropsis minima, Dall. ; enlarged. 



6. Ceropsis minima, Dall. ; much enlarged. 



7. i?e/a ? loevigata, Dall. 



8. Volutharpa ampullacea, var. acuminata, Dall. 



9. Amphissa corrugata, Rve. 



10. Amphissa versicolor, Dall. 

 11. 



12. Pedicularia Japonica, Dall. 



13. Buccinum Fischerianum, Dall. 

 14 — 15. Anisothyris ledceformis, Dall. 



