TWENHOFEL: EXPEDITION TO THE BALTIC PROVINCES. 309 
Protocrisina exigua Ulrich. 
Pseudohornera orosa (Wiman). 
Ptilodictya gladiola. 
Sceptropora facula Ulrich. 
Atrypa imbricata. 
marginalis Dalman. 
cf. nodostriata Hall. 
undifera Schmidt. 
Clitambonites sinuatus. 
verneuili. 
Discina gibbi Lamarck. 
Eleutherocrania gibberosa. 
Leptaena rhomboidalis (Wilckens). 
Orthis actoniae. 
oswaldi. 
sadawitzensis. 
Platystrophia biforata lynx. 
Plectambonites schmidti. 
sericeus (Sowerby). 
Pseudocrania cranoides. 
Pseudometoptoma concentricum. 
monopleurum. 
Streptis sp. 
Strophomena expansa Sowerby. 
luna. 
tenuistriata. 
Triplecia insularis. 
Byssonychia cf. radiata. 
Ectomaria nieszkowski Koken. 
Eunema rupestre. 
schmidti. 
Euomphalus dimidiatus Koken. 
gradatus Koken. 
helicoides Koken. 
Helicotoma superba Koken. 
Murchisonia meyendorfi Koken. 
Pycnomphalus borkholmemsis. 
Trochonema minor Koken. 
panderi Koken. 
peraltum Koken. 
Tryblidium esthonum Koken. 
lindstrémi Koken. 
