AKT. 17 ILLUSTRATIONS OF TYPES OP SHELLS BALL 39 



Page 



Fig. 5. Cocculina japonica Dall, Ion. 8.2 mm 11 



6. Pundurella cucullata Gould, profile, alt. 22.5 mm 24 



7. Urosalpinx perrugatus Conrad, alt. 27 mm 30 



8. Pundurella cucullata Gould, interior view, Ion. 22.5 mm 24 



9. Colus (Aulacofusus) sapius Dall, alt. 23 mm 14 



Plate 27 



Fig. 1 . Vesicomya suavis Dall, Ion. 35 mm 30 



2. Erycina colpoica D&W, \on. 10 mm 16 



3. Williamia vernalis 'D2i\\,\on. 14 mm 31 



4. Pseudamusium arces Dall, alt. 21 mm 24 



5. Williamia vernalis Dall, profile, Ion. 14 mm 31 



6. Plicaiula gibbosa Lamarck, interior of right valve, Ion. 28 mm 24 



7. Plicatula gibbosa Lamarck, interior of left valve. Ion. 28 mm 24 



8. Dentalium crocinum Dall, Ion. 39 mm 16 



9. Ostrea permollis Sowerby, upper valve in place, lat. 40 mm 23 



10. Ostrea permollis Sowerby, interior of lower valve, lat. 40 mm 23 



Plate 28 



Fig. 1. Ostrea equestris Say, interior of lower valve. Ion. 35 mm 23 



2. Aligena nucea Dall, Ion. 4.5 mm 2 



3. Ostrea equestris Say, upper valve in place. Ion. 35 mm 23 



4. Liocyma aniwana Dall, young dorsal view, Ion. 25 mm 18 



5. Ostrea frons Linnaeus, inside of lower valve, natural size 23 



6. Liocyma aniwana Dall, young profile. Ion. 25 mm 18 



7. Ostrea cristata Born, upper valve in place, Ion. 45 mm 23 



8. Ostrea cristata Born, interior of lower valve, Ion. 45 mm 23 



Plate 29 



Fig. 1. Lzocyma anitrana Dall, adult profile. Ion. 24 mm 18 



2. Liocyma aniwana Dall, adult dorsal view. Ion. 24 mm 18 



3. Corbicula (Cyrenodonax) formosana Dall, Ion. 12 mm 15 



4. Nucula mirifica Dall, profile, Ion. 36 mm 22 



5. Cuspidaria trosaetes Dall, Ion. 24 mm 16 



6. Lima hamlini Da,\l, Ion. 53 mm 18 



7. Yoldia johanni T)a.]\, Ion. 28 mm 32 



8. Pholadomya pacifica Dall, exterior of left valve, Ion. 43.5 mm 24 



9. The same, interior of left valve. Ion. 43.5 mm 24 



10. Nucula mirifica Dall, interior of left valve. Ion. 36 mm 22 



Plate 30 



Fig. 1. Ancistrolepis okhotensis Dall, alt. 45 mm 4 



2. Mohnia clarki DaW, alt. 21 mm 21 



3. Mohnia sordida Dall, alt. 26 mm 21 



4. Mohnia vernalis Dall, alt. 21 mm 21 



5. Buccinum sakhalinensis T)a\\, a\t. 3Q mm. 8 



6. Buccinum anivjanum JyaW, a\t. 4i% miw 6 



7. Buccinum bombycinum Dall, alt. 27 mm 6 



8. Ancistrolepis grammatus Dall, alt. 101 mm 3 



9. ikfo/mia micra Dall, alt. 15 mm 21 



