PARALLEL OF GOTHLAND WITH ENGLISH AND AMERICAN TYPES. 18* 
posed of the same Lower Silurian group which we had followed over the main land, 
(its Orthoceratite marble limestones having been largely exported to all parts of 
the Baltic), the island of Gothland is exclusively of Upper Silurian age. The 
ief rock of this island is a limestone very similar to that of the upper deposit of 
ristiania, and is loaded with corals, many of which, including Catenipora escha- 
oides, C. labyrinthica, Favosites Gothlandica , are well-known species in the Wenlock 
n d Dudley limestone ot England. With these are associated 
(Sv—T' 10 d f pressa ’ L - ew S l VP ha > A try pa tumida, Pentamervs (. dtrypa ) galeatus, P. conchidium, Delthyris cyrtamu 
bricat ” Terebratula VPilsoni Sow. {T. lacunosa of the Swedish authors), T. marginalis Dalm. im- 
His P ■ ^ le, ^ c fl ar ts hinn. (Silur. variety of T. prised), T. media, T, plicatella Dal., Euomphalus sulcatus 
q ■ , . unta alnta, Avieula retroflexa His., Tellma prisca, Orthoceratit.es communis Wahl. (0. Ludense Sil. Syst.), 
Lit, v r m mlatus His. (0. ibex Sil. Syst.), 0. annulatus Sow. (0. undulatus His.), Phragmoceras, 
‘-ttuites, Calymcne Blumenbachii, C. variolaris Brong., Asaphus c audatuP, 
^d a number of other frilobites, among which is a rare example of the genus 
Brontes (Goldfuss). 
The coincidence of numerous fossils published as Upper Silurian types in England 
is so truly remarkable, that doubtless the rocks in the two countries are of exactly 
the same epoch. The actual examination of these fossils has also enabled us to 
see, that certain British species which, judging from the published figures of Hi- 
singer, were supposed to be distinct, are, in fact, identical with forms previously 
named by that author, whose terms will necessarily in all such cases be adopted. 
Tnlst the whole Gothlandian group is thus unquestionably proved to be Upper 
i unan, a large part being undoubtedly on the exact parallel of the Wenlock lime- 
e i ve might (judging from certain lossils, such as the Avieula retroflexa and a 
qjecies of Bi ontes 2 , both found with certain Orthoceratites in a sandy rock at Mount 
omberg in the southern part of the island) be led to think, that the true equiva- 
e nt of the Ludlow rocks is also there present. This is, indeed, rendered highly 
probable from what is found to be the case in the Russian island of Oesel (see 
P- 35 ). But we desist from any further attempt at close subdivisional comparison 
until we have personally examined the localities 3 . 
Among the Gothland Crinoidea we observed the remarkable Hypanthocrinites decorus as well as the 
A ctinocrimt es moniliformis of Dudley. 
9 rpi , # J 
L dl 10U ^ 1 n °^ P u ^^ s ^ lec ^ A* the Silurian System, the genus Brontes has been found by Dr. Lloyd in the 
°w rocks, and even in their lower division. The genus is, therefore, common to the Upper Silurian 
and Lower Devonian strata. 
detailed map Hisinger correctly lays down the Island of Oland as consisting in ascending order 
lim anC ' bt ° ne ’ a * um s ' ate an d Orthoceratite limestone, whilst Gothland is all composed of his younger 
