twenhofel: expedition to the Baltic provinces. 331 



dolomite in which the Eurypterus fauna is magnificently preserved. 

 Eurypterids from here are Bunodcs lunula Eichwald, B. rugosus Niesz- 

 kowski, B. schrnicki Xieszkowski, Eurypterus fischcri Eichwald, Pseu- 

 doniscus aculeatus Xieszkowski, and Pterycjotus sp. An Orthoceras, 

 0. tenuis Wahlenberg, is cjuite common in the eurypterid layer and 

 there are also two cephalaspidian fishes, Thyestes verrucosus Eichwald 

 and Tremataspis schrencki Schmidt. This layer is overlain by about 

 eighteen inches of mottled yellow and gray, nearly unfossiliferous 

 limestone from which have been collected a few fish scales, Lepcr- 

 ditia angelina Schmidt and Platyschisma helicites. 



What is probably the same eurypterid horizon is exposed on the 

 seashore at Attel, about six or seven miles southwest. The rock 

 nearest the water-level consists of two feet of gray to white dolomitic 

 limestone in one to four inch beds. Some of the beds are crowded 

 with Leperditia angelina while others have many eurypterids. Masses 

 of Clathrodictyon up to two feet in diameter are associated in the 

 same beds with the eurypterids and toward the top is a thin layer 

 which has the appearance of being a conglomerate, but it may be that 

 the "pebbles" are of organic origin. The upper portion of the beach 

 is covered with debris, and it is probable that from five to six feet of 

 strata are concealed. At the top of the beach is a low clift' in which 

 ^bout four feet of thick-bedded gray limestone are shown. Below the 

 dolomitic beds at the water's edge there appear to be beds of coralline 

 limestone with many stromatoporoids. 



Between Rotzikiill and Attel are the exposures of Lello Brook. 

 These are a little above the eurypterid beds and show about six feet 

 of thin-bedded limestone, containing many Platyschisma helicites, and 

 in some layers numerous Leperditia angelina. Many fish remains, 

 chiefly scales, have also been collected. Species of fish from this 

 place are : — 



1. ' Coccopeltus asmussi Pander. 



2. Coelolepis carinatus Pander. 



3. goebeli Pander 



4. laevis Pander. 



5. schmidti Pander. 



6. Coscinodus agassizi Pander. 



7. Ctenognathus murchisoni Pander. 



8. Cyphomalepis egertoni Pander. 



9. Dasylepis keyserlingi Pander. 

 10. Dictyolepis bronni Pander. 



