i8o 



BUSH 



16. Eudistylia ahbreviata sp. nov. Yakutat to Sitka. 



17. Chone teres sp. nov. Unalaska Island. 



18. Myxicola conjuncta sp. nov. Prince William Sound. 



19. Myxicola glacialis sp. nov. Unalaska Island. 



20. Serj)ula splendens sp. nov. Prince William Sound. 



21. Crucigera formosa sp. nov. Unalaska Island to Wrangel. 



22. Crucigera irregularis sp. nov. Juneau. 



23. Hyalofomatofsis occidentalis sp. nov. Prince William 



Sound. 



24. Spirorbis semidentatus sp. nov. Unalaska Island to 



Sitka. 



25. Spirorbis variabilis sp. nov. Sitka. 



26. Spirorbis morcki Levinsen. Prince William Sound to 



Sitka ; also North Atlantic. 



27. Spirorbis incongruus sp. nov. Prince William Sound. 



28. Spirorbis quadrangular is Stimpson. Prince William 



Sound ; also North Atlantic. 



29. Spirorbis lineatus sp. nov. Prince William Sound. 



30. Spirorbis similis sp. nov. Prince William Sound. 



31. Spirorbis violaceus Levinsen. Prince William Sound 



to Sitka ; also North Atlantic. 



32. Spirorbis spirilluin Linne. Loc. ? to Santa Barbara, 



California ; also North Atlantic. 



33. Spirorbis rugatus sp. nov. Sitka. 



34. Spirorbis asperatus sp. nov. Prince William Sound to 



Pacific Grove, California. 



35. Spirorbis abnonnis sp. nov. Sitka. 



Puget Sound Region : 



36. Eudistylia tenella sp. nov. Vancouver Island, British 



Columbia. 



California, Pacific Grove : 



37. Parasabella sp. 



38. Pseudopotamilla debilis sp. nov. 



39. Eudistylia intermedia sp. nov. 



40. Afetachone mollis sp. nov. 



41. Myxicola affinis sp. nov. 



42. Protula atypha sp. nov. 



43. Eupomatus gracilis sp. nov. 



44. Spirorbis eximius sp. nov. 



45. Spirorbis comptus sp. nov. 



Mexico : 



46. Eupomatus humilis sp. nov. 



