244 REFERENCE TO PLATES. 



FIGURE. PAGE. 



25. Tethys orien tails Sowb. C. Icon., 104 



26, 27. Tethys sinensis Sowb. C. Icon 104 



28. Tethys pulmonica Old. U.S. Expl.Exped., 96 



PLATE 19. 



29, 30 31. Tethys inca Orb. Voy. Am. Merid., . ..... 87 



32, 33. Petalifera similis Sowb. (=virescens). C. Icun., . . .130 

 34-36. Tethys ran gian a Orb. Voy. Am. Merid., .... 86 



PLATE 20. 



37-39. Tethys livida Orb. Voy. Am. Merid., . ...... 79 



40, 41. Tethys grandis Pse. Conch. Icon., 92 



42. Tethys trigona Sowb. Conch. Icon., .112 



43, 44. Tethys bipes Pse. Conch. Icon., 91 



45. Tethys cornigera Sowb. Conch. Icon., 103 



46, 47. Tethys sandwicensis Sowb. Conch. Icon., 92 



PLATE 21. 



1-5. Colpodaspis pusiUa Sars. After Garstaug 28 



6-11. Colobocephalus costellatus Sars. After Sars 33 



12. Paraplysia pi perata Smith. After Gilchrist, 115 



13, 14. Paraplysia monhoti Gilchrist. After Gilchrist, . . .115 



PLATE 22. 



1-5. Tethys sorex Rang. After Rang, 94 



6-9. Dolabrifera oahouensis Souleyet. Voy. Bonite, . . . 122 

 10, 11. Tethys nigra Orb. Voy. Am. Merid., . ..... 85 



PLATE 23. 



26, 27. Tethys depilans Linne. After Rang, 69 



28-32. Pleurobranchus cornutus Q. &. G. Voy. Astrolabe, . 206 



PLATE 24. 



33, 34. Tethys depilans Linne. After Rang, 69 



35, 36. Tethys depilans Linne. After Jeffreys, 69 



PLATE 25. 



1. Tethys geographicus A. & R. Voy. Samarang, . . . .103 



2. Tethys peasei Pils. Am. Journ. Conch., 95 



