NO. 2223. CHITONS FROM THE NORTHWEST PACIFIC— BERRY. 17 



Plate 6. 



Fig. 1. Ischnochiton{Lepidozona)int€rfossaBerry [115], dorsal aspect oi type; X 2. 



2. Ischnochiton (Lepidozona) interfossa Berry [114], dorsal aspect of first, fifth, 



and last valves of paratype; X 6. 



3. Dorsal aspect of portion of girdle of same specimen; drawn from a mount 



in balsam; X 12. 



4. Portion of same preparation under greater magnification; X 43. On the 



immediate area selected for illustration the scales are less crowded than 

 is typically the case. 



5. Jschnochiton{Lepidozona) pilsbryanus Berry [118], doTsal aspect oi type; X IJ. 



6. Ventral aspect of same; same scale. 



7. Ischnochiton (Lepidozona) pilshryanus Berry [119], dorsal aspect of first, third, 



and last valves of paratype; X 4.8. 



8. Dorsal aspect of portion of girdle of same specimen; drawn from a mount 



in balsam; X 9^. 



9. Portion of same preparation under greater magnification; X 27. The 



scales are typically much more crowded than appears in the drawing. 



Plate 7. 



Fig. 1 . Ischnochiton {Lepidozona) pilshryanus Berry [119], exterior view of first, third, 

 and last valves of paratype; part camera drawing; X 7. 



2. Interior view of same; same scale. 



3. Anterior view of third valve; same scale. 



4. Interior view of left side of second valve; same scale. 



5. Lateral view of tail valve; same scale. 



6. Isolated girdle scales from same specimen; camera drawing from a mount 



in balsam; X 25. 



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



in balsam; X 52. 



Plate 8. 



Fig. 1. Placiphorella stimpsoni (Gould) [93], dorsal aspect of a specimen from Hako- 

 date; slightly magnified. 



2. Ventral aspect of same; same scale. 



3. Placiphorella borealis Pilsbry [94], dorsal aspect of a specimen from 228 



fathoms, off Simushir Island; same scale. 



4. Ventral aspect of same; same scale. 



5. Portion of margin of anterior lobe of girdle of another specimen from the 



same lot; viewed ventrally from a preparation in balsam; X 18. 



6. Chiton species [120], dorsal aspect of a specimen from Aikawa;' X 2.4. 



Plate 9. 



Fig. 1. Placiphorella stimpsoni (Gould) [93], exterior view of first, fourth, and last 

 valves; camera drawing; X 2§. 



2. Interior view of same; same scale. 



3. Posterior view of sixth valve; same scale. 



4. Basal portion of large epinose brisfle from anterior lobe of girdle of same 



specimen; camera outline from a mount in balsam; X 65. 



5. Isolated spine from large bristle; camera drawing; X 65. 



6. Portion of margin of girdle near front of anterior lobe of same specimen; 



camera drawing from a mount in balsam; X 65. 



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



in balsam; X 65. 



8. Series of teeth from one side of radula of same specimen; same scale as fig. 7. 

 3343— 19— Proc.N.M.VoI.54 3 



