16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



Plate 3. 



Fig. 1. Ischnochiton (Ischnoradsia) albrechti Schrenck [83], isolated girdle scales 

 drawn by camera from a mount in balsam; the largest scale shows radial 

 striae, the others transverse color bands; X 31. 



2. Isolated radiila teeth from same specimen; camera drawing from a mount 



in balsam; X 31. 



3. Ischnochiton (Ischnoradsia) hakodadensis Carpenter [84], isolated girdle scales 



of a specimen from Mororan; camera drawing from a mount in balsam; 

 X31. 



4. Isolated radula teeth from same specimen; camera drawing from a mount 



in balsam; X 66. 



5. Ischnochiton (Ischnoradsia) hakodadensis Carpenter [85], isolated radula teeth 



of a specimen from Hakodate; camera drawing from a mount in bal- 

 sam; X 66. 



6. Ischnochiton (Lepidozona) amabilis Berry [113], isolated girdle scales of 



paratype; camera drawing from a mount in balsam; X 31. 



7. Two major lateral teeth from radula of same specimen, camera drawing 



from a mount in balsam; X 66. 



8. Ischnochiton (Lepidozona) interfossa Berry [114], isolated girdle scales of 



paratype; camera drawing from a mount in balsam; X 31. 



9. Isolated teeth from radula of same specimen; camera drawing from a mount 



in balsam; X 66. 



Plate 4. 



Fig. 1. Ischnochiton (Ischnoradsia) hakodadensis Carpenter [85], dorsal aspect of a 

 specimen from Hakodate; X l^- 



2. Ventral aspect of same specimen; same scale. 



3. Dorsal aspect of fourth valve of another specimen from the same lot; X 4. 



4. Ischnochiton (Lepidozona) amabilis Berry [112], dorsal aspect of type; X 2. 



5. Dorsal aspect of a portion of girdle of paratype [113]; camera drawing from 



a mount in balsam; X 11. 



6. Portion of same preparation under greater magnification; X 50. 



7. Dorsal aspect of first, fifth, and last valves of paratype [113]; X 6|. 



Plate 5. 



Fig. 1. Ischnochiton (Lepidozona) amabilis Berry [113], exterior view of first, fifth, 

 and last valves of paratype; camera drawing; X 6^. 



2. Interior vieAV of same; same scale. 



3. Anterior view of fifth valve; same scale. 



4. Profile of last valve; same scale. 



5. Ischnochiton (Lepidozona) interfossa Berry [114], exterior view of first, fifth, 



and last valves of paratype; camera drawing; X 6. 



6. Interior view of same; same scale. 



7. Anterior view of fifth valve; same scale. 



8. Profile of last valve; same scale. 



