i:i ri 1:1 N< i TO rr. \ i 119 



I'l Ml '.'. 



'-' ; Ml 



1. Ojjptoplax oeulattu Q. & G. Challenger K-p , . ;,/, 



2-5. Cryptoplax oculatus. Valves i, ii. iii ;m<l viii. Challen- 

 ge'' 1^'p-' ...... .,., 



6. Cryptoplax burrowi K. A. Smith. Condi. I. .yj 

 7-10. Cryptoplax burrowi. Valves i, ii, iii. and viii. I! A 



Smith del., . . . . . .-, i 



11-14. Cryptoplax striatus Lam. Challenger Rep., 

 15. Cryptoplax striatus Lam. Challenger Rep., 



PLATE 10. 



1, 2 Chiton subassimilis Souv. Journ. de Conch., . . 99 



3, 4 Chiton discolor Souv. Journ. de Conch., . . 89 



5, 6. Chiton tuberculosus Souv. Journ. de Conch. . . 99 



7. Chiton platymerus Sowb. Beechey's Voy., . 1 1 ."> 



8. 9. Chiton obscurellus Souv. Journ. de Conch., 



10, 11. Tonicia insculpta Souv. Journ. de Conch., . . 89 



12. Chiton glaucocinctus Fremb. Zool. Journ. . . . lo: 



13-17. Ischnochiton cessaci Roch. Nouv. Arch. Mus., . . 81 



18, 19. Chiton fimbriatus Sowb. Conch. 111., . . .110 



20. Chiton undulatus Sowb. Beechey's Vov.. . . . 11. "i 



21, 22. Chiton concinnus Sowb. Conch. 111., 

 23-26. Cha?topleura pustulata Kr. Sudafrik. Moll., 



27, 28. Callochiton sanguineus Dh. Moll. Reun.. . . 67 



29, 30. Chietopleura jaspidea Gld. U. S. Expl. Exped., . To 



PLATE 11. 



31. Cryptoplax larvseform is Burrow. Ross del., . . .56 



32. Cryptoplax larvseformis. Edge of foot, showing marginal 



row of longer spicules. Pilsbry, del., . . .56 



33. Cryptoplax larvseformis, One sq. mill, of upper surface. 



Pilsbry del., 56 



34. Cryptoplax larva?formis. One of the sutural tufts. Pils- 



bry del., 



35. Cryptoplax larvasformis. Ross del., 



36. Cryptoplaxlarvreformis. Valves i,ii, iii, viii. Challenger 



Rep., .56 



37. Cryptoplax striatus Lam. Edge of foot. shn\vin_- 



spiculose upper surface, and asperulate basal surface of 

 girdle. Pilsbry del., 



38. 39. Cryptoplax striatus Lam. Ross del., 



40-43. Cryptoplax striatus. Valves i, ii, viii. Pilsbry del., 53 



PLATE 12. 



44, 45, 47. Acanthochites exquisitus I Mis. Pilsbry del., 

 46. Acanthochites exquisitus Pils. Rossdel.. 



