cxiv BRITISH GRAPTOLITES. 



giganteus, Desmog. diffusus, Desmog. bohemicus, Desmog. frondescens, Dictyonema 

 Barrandei. Owing to the absence either of descriptions or figures none of these 

 forms can be identified. 



A most important paper by Barrois appeared in 1892 

 „ ' '. dealing with the Distribution of Graptolites in France. In 



Barrois, ° l 



" Memoire sur la Dis- this paper Barrois collected together all the scattered infor- 



tribution des Grapto- mation obtained by himself and others for many past years 



lites en France," ' Aim. ag t the occurrence of Graptolites in France. In addition 



to recording all such Graptolite species as had been discovered 

 and identified, several species are fully described by him, 

 but no figures are given. 



In Languedoc three horizons are recognisable. From the lowest (Arenig) 

 the following species are described : Didymog. balticus, D. v-fractus, D. pennatulus, 

 D. nitidus, D. bifidus, D. indentiis, D. Escoti, Tetrag. serin and T. quadribra- 

 chialus ; from the middle one (Llandeilo) only I), euodus ; from the highest 

 (Wenlock Shales) M. priodon, M. bohemicus, M. colonus, M. Boemeri, M. Nilssoni. 



From the Pyrenees the Graptolites are mainly of Birkhill-Tarannon age, and 

 the following species are described : Monog. Becki, M. priodon, M. attenuatus, 

 M. crispvs, M. proteus, M. Barrandei, M. spiralis, M. communis, M. nodifer, M. 

 sartorius, M. runcinatus, M. Salteri, M. crassus, M. Haiti (?), M. lloemeri, M. riccar- 

 tonensis, M. vomerinus, M. basilicus, M. Nilssoni, M. concinnus, M. discus, M. 

 Lapworthi, Gyrtog. Murchisoni, Cyrtog. Grayi, Iietiolites Geinitzianus, Ii. perlatus. 



From the Ardennes, Graptolites of Cambrian, Arenig, Caradoc, Lower Llan- 

 dovery, Tarannon, Wenlock and L. Ludlow age are recorded. From Normandy 

 only Wenlock fossils are known. 



In Brittany, Didymog. Murchisoni, D. euodus, I), nanus, I), furcillatus are 

 described from Angers, while Diplog. foliaceus and D. augustifolius represent the 

 Glenkiln horizon. The Llandovery strata o? Anjou contain Monog. spiralis, M. 

 crenidaris, M. lobiferus, M. sublobiferus, M. Sedgwichii, M. cyphus, M. Glingani, 

 Glimacog. nornialis, Gc phalog. folium, Diplog. Eughesi, Bastrites peregrinus, and 

 B. Linnsei. 



The Ampelite schists of Western France are shown by their fossils to be of 

 Tarannon-Wenlock age, and the Ampelite limestones to occupy a somewhat higher 

 horizon. 



1892. Giirich, in a paper published during this year, discussed 



Gitrick, Jaekel's proposed division of the genus Monograptus into 



Pomatograptus and Pristiograptus, and suggested that for the 



nimg von MoncxjraptiLs . a -. , ,, ,, ,.,, „ , , ,, 



. , ,, t „., two groups typified by these names the titles of (a,) Mono- 



priodon, ' Sitzungs- ° r ~ r J v ' 



bericht d. Schles. grapti reversi, and (b) Monograpti erecti, should be substi- 



Gesell., Naturw. Sect., tuted, as the " question of their systematic relationships was 



Breslau.' as y e t not ripe for decision." He gives a " schematic 



