TWENHOFEL: expedition to the BALTIC PROVINCES. 297 



28. Ptilodictya flabellata Eichwald. 



29. gladiola Billings. 



30. Stellipora constellata Dybowski. 



31. Stomotopora arachnoidea (Hall). 



32. Atrypa imbricata Sowerby. 



33. Clitambonites sinuatus (Pahlin). 



34. verneuili (Eichwald). 



35. Dalmanella elegantula estona (Wysogorski). 



36. wimani Mickwitz. 



37. Dinorthis Solaris (von Buch). 



38. Orthis actoniae Sower.by. 



39. callactis Dalman. 



40. concinna Lamansky. 



41. flabellum Sowerby. 



42. lyckholmensis Wysogorski. 



43. oswaldi von Buch. 



44. vespertilio Sowerby. 



45. Platystrophia biforata lynx (Eichwald). 



46. fissicostata (McCoy). 



47. Plectambonites schmidti (Tornquist). 



48. Porambonites gigas Eichwald. 



49. Pseudolingula quadrata (Eichwald). 



50. Rafinesquina deltoidea (Conrad). 



51. Strophomena tenuistriata Sowerby. 



52. Triplecia insularis (Eichwald). 



53. Byssonychia cf. radiata (Hall). 



54. Bucania contorta Eichwald. 



55. cornu Koken. 



56. crassa Koken. 



57. cycloides Koken. 



58. radiata (Eichwald). 



59. Ectomaria kirnaensis Koken. 



60. Eunema rupertre Eichwald. 



61. sulcifera Eichwald. 



62. schmidti, Koken. 



63. Euomphalus carinifer Koken. 



64. gradatus Koken. 



65. laminosus Koken. 



66. Holopea ampulacea Eichwald. 



67. coronata Koken. 



68. Isospira bucanoides Koken. 



