IG V. A. BATHER, CRINOIDEA OF GOTLAND. 



(I Limestone beds with Mar] bands, or Oolite in S.Gotland. This, in its two forms, 



from 20 ex tends över almost the wholé isla.nd. The Crinoids occur more in the N. than 



to in the S., and belong for the most part to the Families Eucalyptocrinida?, 



50 teet. \ ( ;tinocrinid8G and Glyptasterida?. Correlated with the Wenlock Limestone, and 



in part synonymons with the »Coralline Limestone», the »Oolithischen Kalk- 



steine», and »Conglomerat mit Phacites gotlandicus of German authors. Perhaps 



corresponding to Niagara Limestone. 



e Pterygotus-heds. Very soft, liglit brown, crumbly clay or marl; sometimes a peculiar 



from t in l° ose limestone. Near Wisby, Klints in Othem, Slite, in the limestone hills of 



to Östergarn, and traces near Fröjel. Characterised by Pterygotus osiliensis, Phas- 



■ e qanocaris and Palceophonus nuncius. From this bed eome Gissocrinus verrueosus, 



a few other Crinoids, a Palceaster and a fine Ophiurid. Correlated with the 



base of the Ludlow Beds, and with the Onondaga Salt group. 



f Crinoid and Coral Conglomerate; consisting very largely of stem-ossie.les of Cri- 



noids, but sometimes, as near Lan, of arm-ossicles and cup-plates. Occurs över 



a large j »art of the island. Crowns of Crinoids only exceptionally preserved and 



at restricted localities, e. g. Follingbo. Crotalocrinus, Enallocrinus, Barrandeo- 



crinus, Cyathocrinus ramosus and C. longimanus are characteristic; but some 



example of every Gotland genus, except Leptocrinus and Gothoerinus, has been 



fonnd in this bed. Correlated with Aymestry Limestone or Lower Ludlow. 



The Coral and Crinoid Limestone (in part) and the Pentamerus cowhidium rock 



of the German Diluvium. 



g Banks of Megalomus gotlandicus, whose place is taken in the S. by Trimerella. 



* n , . Stretch from the N. point of the island as far as Ileide and Ardre in the S. No 

 12 teet. 



Crinoids certainly recorded. Correlated with Guelph Limestone and Megalomus 



Beds of N. America, but are probably only a facies of the preceding bed. 



Ii Uppermost Cephalopod Bed. An obscurely stratified, härd limestone, often an intense 



red. Very rich in Cephalopoda. Crinoids are represented only by Calceocrinus 



pinnulatus, Corym bocrinus grandistellatus, Eucalyptocrinus speciosus, Callicrin us 



Roemerianus. Correlated with Upper Ludlow and Lower Helderberg. 



The above Classification differs very slightly from that of Lindström (ojp. f/f.), the 



chief alterations being in the thicknesses of the beds, which, however, are still only ap- 



proximate. My hed Ii corresponds to g; of Damen 1 ) rather than to It of Lindström; but 



the horizon g is retained as a convenient way of denoting the uppermost Megalomus and 



Trimerella Beds: this course seems preferable to that of confusing readers by the alteration 



of well-known symbols. A stay of a few weeks in Gotland has convinced me that Prof. 



Lindström's correlation of the rocks in the different parts of the island is in all essentials 



perfectly correct: on this matter 1 hope to publish a few remarks elsewhere. The Correla- 



tions with the horizons of other countries are given solely on Prof. Lindström's authority, 



since this is a question on which the Crinoids hitherto studied do not, for reasons explained 



on ]). 7, throw much light. 



') W. Dames, »Ueber die Schichtenfolge der Silnrbildungen Gotlands Ac.» Sitzber. d. k. preuss. Ak. d. 

 Wiss. Berlin, XLII, pp. 1111-1129. 1890. 



