TWENHOFEL: EXPEDITION TO THE BALTIC PROVINCES. 323 
considerable number of flint concretions occur. Another quarry at 
Pajus has an exposure of about eight feet of finely crystalline hard 
limestone in beds up to eight inches thickness. A few poorly preserved 
corals were the only fossils seen. These two exposures are near the 
base of the Addifer formation, and they may belong to the Raikiill 
beds. 
At Nudi, about five miles south of Raikiill, and on lower ground, is 
an old abandoned quarry, once extensively worked. About four feet 
of horizontal strata are exposed of which the basal two feet consist of 
thin-bedded, gray crystalline limestone with thin shale partings, and 
the upper two feet of thin-bedded, poorly crystalline white limestone. 
Fossils are quite common throughout and in some layers they are very 
abundant. Altrypa reticularis, Pentamerus, like P. oblongus from the 
Clinton of New York, and Eospirifer radiatus are those most common. 
These strata probably are situated quite near the base of the formation. 
The formation is excellently exposed at Kattentack near the village 
Turpel. About four feet of thin-bedded limestones are exposed in 
which corals are the chief fossils, these consisting of Favosites, Lyellia, 
Halysites, and Zaphrentis. Large Pentamerus estonus and Orthis ef. 
callagramma Dalman are also not uncommon. 
Other localities where the strata of the formation can be seen are 
Kerro, Fennern, and Keskfer. 
The fauna of the Addifer formation is evidently quite large, but has 
not been well studied or collected. Important species are: — 
Alveolites labechi Milne Edwards. 
Darwinia speciosa Dybowski. 
Favosites gothlandicus. 
hisingeri Milne Edwards and Haime. 
Halysites catenularia. 
distans Eichwald. 
exilis Eichwald. 
Syringopora bifurecata Lonsdale. 
Vincularia megastoma. 
10. nodulosa. 
11. Atrypa reticularis. 
12. Eospirifer radiatus. 
13. Pentamerus estonus. 
14. Schuchertella pecten (Linné). 
15. Strophomena euglypha Dalman. 
16. Orthoceras canaliculatum Sowerby. 
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