220 bulletin: museum of comparative zoology. 



Tullb., Remopleurides sexlineatus Ang., Ampyx rostmtus Sars, Dal- 

 manella argentea (His.), Corynoides calicularis Nich., Dicranograptus 

 clingani Carr., Diplograptus qiiadrimucronatus Hall, Climacograptus 

 scharenhergi Lapw., and Ptychopygc ? glabraia Ang. The zone of 

 Dicranograptus clingani is at the base of the Chasmops beds, and the 

 zone of Plcurograptus linearis at the top. 



The fauna of the Lower Dieellograptus shales has been monographed 

 by Hadding (60), who lists the following as characteristic fossils of 

 the thin-bedded gray-black shales which make up the strata of the 

 three subzones in Scania. 



Subzone of N emagraptus gracilis. — Xemagraptus gracilis rcmotus 

 Elles & Wood, Lasiograptus mucronatus Hall, Obolus clatus Hadding, 

 Plectambonites sericeus restrictus Hadding. 



Climacograptus putillus zone. — Climacograptus putillus Hall, C. 

 caudatus Lapw., Dieellograptus vagus Hadding, and Dicranograptus 

 irregularis Hadding. 



Glossograptus hincksi zone. — Glossograptus hincksi Hopk., Crypto- 

 graptus lanceolatus Hadding, and Diplograptus perexcavatus Lapw. 



The Upper Didymograptus beds consist of green and gray shales and 

 the fauna seems to be incompletely known. 



In the Didymograptus gcminiis beds. — D. geminus Hisinger, 

 Lonchograptus ovatus Tullb., Climacograptus confertus Lapw., Ptero- 

 graptus sca7iicus Moberg, P. elegans Holm, and species of Diplo- 

 graptus and Cr\-ptograptus have been reported. 



From the lower zone. — Phyllograptus cf. typus, Didymograptus 

 cf. bifidus, Climacograptus and Cryptograptus are reported. It seems 

 to be a sort of transition zone, in which the Diprionian graptolites 

 which are so abundant in the beds above make their first appearance, 

 but accompanied by some of the survivors of the more ancient 

 fauna. 



The Orthoceras limestone is a hard, rather pure, dark blue limestone 

 and is at present inadequately exposed. Angelin (58) described 

 twenty species of trilobites from the quarries at Fagelsang, some of the 

 more important of which are * Ampyx nasutus Dalm, Asaphus acumi- 

 natus (Boeck), *Cyrtometopus clavifrons, *MegaJaspis limhata (Sars 

 and Boeck), *Xileus armadillo Dalm, Symphysurus palpebrosus 

 (Dalm), *Xiobe frontalis Ang., *Ptcrygomctopus sclcrops (Dalm), 

 Trinucleus coscinorrhinus Ang. The species marked with an asterisk 

 occur in the Limbata or Expansus limestones of Sweden and in the 

 zones B,,^ and B,,,„ of Russia. 



According to Strandmark (81), beds of shale containing graptolites 



