CXV1U 



BRITISH GRAPTOLITES. 



1893. 

 Hall, T. S., 

 " Note on the Distribu- 

 tion of the Graptolitidse 

 in the Rocks of Castle- 

 maine," 'Australian 



T. S. Hall in this year contributed a short note on the 

 " Distribution of the Graptolitidge in the Rocks of Castle- 

 maine." 



The zones which he recognises from below upward are as 



follows: (1) Tetragraptus fruticosus with Tetrag. quadri- 



Assoc. for the Advance, brachiatus and Phyllog. typus, etc. ; (2) Didymograptus Infill its; 



of Science. ^ Didymog. caduceus and Phyllog. typus ; (4) Didymog. 



caduceus without Phyllog. typus; (5) Loganograptus Logani 



occurs at a high horizon, and probably occupies a fifth zone. 



1893. 

 „ . The same year Barrois described and figured a specimen 



" Sur le Bouvilligraptus °f Oraptolithus Richardsoni, from Cabrieres, and suggested 



Bichardsoni de Cab- the generic name of Rouvilligraptus for species of this 



type. 



rieres," 'Ann. Soc.Geol 

 du Nbrd,' t, 21. 



1894. 



Perner, 



' Etudes sur les Grap- 



tolites de Boheme,' 



pt. i. 



In 1894 Perner published the first part of his exten- 

 sive work on the " Graptolites de Boheme," a memoir in 

 which he revised and carried on the Graptolite work so 

 brilliantly begun by Barrande in 1851. This first part is 

 devoted mainly to the study and description of the minute 

 structure of the Graptolite skeleton. 



An early section of the paper is devoted in part to a defence of Jaekel's work 

 and his division of the genus Monograptus into Pomatograptus and Pristwgraptus, 

 and in part to a study of the thecal wall and its ornaments. 



The greater portion of the memoir is, however, devoted to an account of the 

 microscopic structure of the skeleton in Monograptus. Perner recognises four 

 distinct layers (in distinction to the three described by previous observers) : (1) the 

 epidermic layer, (2) the black layer, (3) the layer with coigns, and (4) the layer 

 with " colonnettes," all of which are described in detail. 



Perner shows that the virgula or " solid axis " does not lie in the dorsal 

 sinus, as was believed by Barrande, but occurs in the third layer, under the 

 black layer. It was very thin and elastic, but hardly ever loses its continuity in 

 the fossil. 



After giving an account of the structure of Betiolites as worked out by 

 Holm and other Swedish authors, Perner concludes with a description of the 

 microscopical structure of the skeleton. 



1894. 

 n .. , ■, In 1894 Pritchard gave a description of a few forms of 



rruchard, ° x 



■ -Notes on some Lance- Graptolites from the Lancefield Beds of Victoria. He also 

 field Graptolites," records Clonograptus flexilis and Tetragraptus quadribrachiatus 

 'Proc. Eoy. Soc. Vict,; f ro]n t ] ie Lancefield locality. 



n.s., vol. vii. 



