KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 2. 



Cyathoerinus 



distensus, Ang. 



f 



» 



longimanus, Axg. 



f 



» 



ramosus, A\o. 



f 



Qissocrinus 



typus, n. sp. 



f 



» 



elegans, Ang. 



f 



» 

 » 



campanula, n. sp. 

 umbilicatus, Ang. 



f 

 f 



» 

 » 

 » 

 » 



macrodactylus, Ang. 

 yoniodactylus Phillips sp. 

 yoniodactylus, var. 

 squamifer, MS. 



f 

 f 

 f 

 f 



» 



incurvatus, Axg. sp. 



f 



» 



verrucosus, n. sp. 



e 



» 



sp. 



c 



Tt is somewhat remarkable that of all these speeies the only ones that are also found 

 in England are Pisocrinus pilula, Hevpetocrinus Fletcheri, H. Ammofiis, Calceocrinus 

 nitidus, Cyathoerinus dcinotubus, Gissocrinus yoniodactylus et var., and G. squamifer. 

 Moreover the forms that are among the commonest in England are the rarest in Gotland 

 and vice versa. The only two speeies that are fairlv common in both regions, viz., Piso- 

 crinus pilula and Herpetocrinus Fletcheri, and to a less extent Cyathoerinus dcinotubus, 

 are among the few that have likewise a greater vertical distribution. ' Consequently the 

 Crinoids prove of no great assistanee in eorrelating the beds. 



A comparison of the above list, either with Axgelix s index, or with Prof. Lind- 

 ström^ låter »List of the Fossil Faunas of Sweden, II, Upper Silurian» (Stockholm, 1888, 

 p. 20), will show many points of difference. The following speeies are here relegated to 

 the limbo of Synonyms: Pisocrinus flayellifer (— P. pilula), Botryocrinus corallum (= B. 

 ramosissimus), Cyathoerinus alutaceus (= C aeinotubus and (\ ratnosus), C zonatus (= C. 

 ramosus), C. granulatus (.= Gissocrinus incurvatus), Myelodactylus gracilis (—?Homo- 

 crinus tenuis and ? Gissocrinus macrodactylus). The following speeies are referred to other 

 genera: Sicyocrinus cucurbitaceus to Botryocrinus, Cyathoerinus incurvatus to Gissocrinus, 

 Myelodactylus interradialis to Taxocrinus? The following speeies have to be dropped, 

 either on account of insufficient description or confusion of the speeies, as explained in 

 each case: Cyathoerinus laivis and C. monilifer (see under C. visbycensis)', Gissocrinus ar- 

 thritieus, G. nudus, G. tubulatus and G. punctuosus (see under G. typus and G. campa- 

 nida). The name Ophiocrinus of Angelin was changed to Streptocrinus by Messrs Wachs- 

 MUTH and Springer; and the name Myelodactylus gives place to Herpetocrinus, and Chiro- 

 crinus to Calceocrinus. 



Study of so rich a collection and such well preserved material has naturally caused 

 many additions to our knowledge, and these additions have in their turn caused changes in 

 theoretical views. Thus there will be found under Pisocrinus (p. 24) a description of the anal 

 struetures, which has involved a complete ehange in the orientation of the calyx, enabling 



