( 701 ) 
while Horm records this fossil from the Eastern-balticum from / 
(15, p. 37), Linpstrém from 46—A in Gothland (16, p. 4, N°. 64). 
ce. Thirdly various limestones with 
Encrinurus punctatus WAuLB. 
may be mentioned here. These ‘Encrinurus-limestones” are not 
further to be determined in age on account of the want of other 
adequate fossils. Some corals, Favosites and Halysites, together with 
which they sometimes oceur, can be of no use for that purpose. 
d. Among the great number of corals from the Groningen 
Hondsrug there are no doubt many of the age of the Lower Oesel 
zone e.g. Thecia Swinderenana Gorpr and others. However I do not 
intend to occupy myself with this question, but later on I shall deal 
with these together with the other corals, whose age is hardly ever 
to be determined between narrow limits, under the heading “Coral- 
limestone.” 
e. Finally I wish just to make mention of a single piece of 
dark-greenish-gray calcareous marl, which contains numerous pygidia 
and head-shields of a Calymmene-species. This boulder found in 
the “Boteringesingel” in Groningen suggests the marly stratum of 
St. Johannis of the /-zone in Oesel, but also corresponds fully with 
marls from different places in Gothland. About the origin, then, 
nothing can be said. Probably we have to do here with Remen%’s 
“Griinlichgrauer Calymenekalk”. (13, p. 27). 
Here ends the enumeration of the boulders of the age Z. Be it 
only added that this zone may possibly be well represented among 
the very manifold dolomites of Groningen. These, however, but 
seldom contain fossils and on account of this admit of no distinctly 
separated groups. At the end of the description of the Upper-Silurian 
boulders, I hope to be able to communicate some particulars about this. 
LITERATURE. 
1. Murcnisoy, R. J. — »The silurian system’. 
London, 1839. 
2. Kormopin, L. — »Bidrag till kinnedomen om Sverges siluriska Os- 
tracoder”’. 
Inaug.-Dissert., Upsala, 1869, 
3. Davipson, TH. — »A monograph of the British fossil Brachiopoda. 
IIT, Devonian and silurian species”. 
London, 1&864—’71. 
48* 
