( 696 ) 
they become only distinctly visible through weathering. The fossil 
fauna consists of the following species. 
Leperditia baltica His. sp. 
Strophomena rhomboidalis Wiek. sp. 
Strophomena sp. 
Atrypa reticularis L. 
Meristella sp. 
Encrinurus punctatus Wane. 
Zaphrenthis conulus Linpstr. ...... . . 28, p. 32, T. VI, f. 65—68. 
Orthoceras sp. 
Murchisonia sp. 
Tentaculites sp. 
Primitia seminulum Jonus........... 14,p.413, Pl. XIV, f. 14. 
Primitia mundula Jones. . . . 23 T. XXX, f. 5—7; 18, p. 375, Pl. XVI. 
Beyrichia. Jonesy Born. „ss sed pio eee 
Beyrichia spinigera Bou... ... . . 23, p. 501, T. XXXT, f. 19—20. 
The first mentioned Leperditia-species is present in all pieces; all 
other fossils, however, occur either few and far between or in a 
single piece, excepting the small ostracoda. I have however not taken 
much pains to increase the number of species of them (for the greater 
part already mentioned by BonneMA), because their stratigraphical 
value is still but tritling nowadays. Then to determine age and origin, 
we can restrict ourselves to the communication where and in which 
strata occurs the type-fossil of this group, Leperditia baltica Hus. sp. 
(after which in accordance with the names of Phaseolus-limestone 
and Grandis-limestone, generally in use, I have called these limestones). 
First of all, however, the number of the pieces found here and 
the special places where they were found, be given here: 
“Noorderbegraafplaats”’, Groningen 7 
“Boteringesingel”’, is 4 
““Noorderbinnensingel”’, 55 5 
“Violenstraat”, A 1 
“Nieuwe Boteringestraat”’, 5 1 
“Nieuwe Kijk-in ’t Jatstraat” 5 2 
“Nieuwe Veelading”, 5 al 
3 1 
“Old Collection” 3 
Helpman 2 
“Hilehestede”, Helpman 1 
Between Helpman and Haren 2 
Harendermolen 1 
