244 REFERENCE TO PLATES. 
FIGURE. 
25. Tethys orientalis Sowb. C. Icon., 
26,27. Tethys sinensis Sowb. C. Teaneea wr 
28. Tethys pulmonicaGld. U.S. Expl. Exped., 
PLATE 19. 
29, 30 31. Tethys inca Orb. Voy. Am. Mérid., . 
32, 33. Petalifera similis Sowb. (=virescens). C. Ieun., . 
34-36. Tethys rangiana Orb. Voy. Am. Mérid., ° 
PuaTE 20. 
37-39. Tethys livida Orb. Voy. Am. Mérid., 
40, 41. Tethys grandis Pse. Conch. Icon., 
42, Tethys trigona Sowb. Conch. Icon., 
43, 44. Tethys bipes Pse. Conch. Icon., 
45. Tethys cornigera Sowb. Conch. Icon., 
46, 47. Tethys sandwicensis Sowb. Conch. Icon., 
PLATE 21. 
1-5. Colpodaspis pusi'la Sars. After Garstang, . 
6-11. Colobocephalus costellatus Sars. After Sars, . 
12. Paraplysia piperata Smith. After Gilchrist, . 
13, 14. Paraplysia monhoti Gilchrist. After Gilchrist, . 
PLATE 22. 
1-5. Tethys sorex Rang. After Rang, . 
6-9. Dolabrifera oahouensis Souleyet. Voy. Bonite, . 
10,11. Tethys nigra Orb. Voy. Am. Mérid., 
PLATE 23. 
Tethys depilans Linné. After Rang, . 
PLATE 24. 
33, 34. Tethys depilans Linné. After Rang, . 
35, 86. Tethys depilans Linné. After Jeffreys, . 
PrarE 25; 
1. Tethys geographicus A. & R. Voy. Samarang, . 
2. Tethys peasei Pils. Am. Journ. Conch., 
ifs 
2. Pleurobranchus cornutus Q. & G. Voy. ‘Astrolabe, . 
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