HISTORY OF RESEARCH. 



cxi 



brief (if any) descriptions of the forms illustrated are given, and the figures are 

 mainly copies from the illustrations to his ' Graptolithen,' 1852, or from other 

 authors ; but the synonomy of each species is given fully. The species referred to 

 are : Monograptus Sagittarius, M. Hisingeri, M. nvntius, M. Nilssoni, M. Salteri, M. 

 tenuis, M. bohemicus, M. latus, M. virgulatus, M. Barrandei, M. colonus, M. 

 frequens, M. testis, M. priodon, M. millipeda, M. Beclci, M. Haiti, M. Flemingi, 

 M. clintonensis, M. Sedgwichii, M. convolutus, M. turricidatus, M. proteus, M. pere- 

 grinus, M. Linnsei, M. gemma tus ; Gyrtograptus Murchisoni, G. radians ; Pterograptus 

 dilaceratus (which he regards as identical with Gcenog. gracilis) ; Didymogra/ptus 

 Murchisoni and D. Forth ammeri ; Tetragraptus serra and T. fruticosus ; Diplograptus 

 ovatus, D. palmeus, D. folium, I), com eta, D. foliaceus, D. teretiusculus, D. pristis, D. 

 secalinus, D. mucronatus, I). Swanstoni ; Phyllograptus cfr. angustifolius ; Triplo- 

 graptus Nereitarnm ; Retiolites Geinitzianus. Geinitz's views appear to have 

 undergone but little change since 18G2, and he refuses to accept such genera as 

 Bastrites, Bicellograptus, Bimorplwgraptus, Glimacograptus, etc. 

 1891. 



Hall, T. S., 



" On a new Species of 



Bictyonema," 'Proc. 



Roy. Soc. Vict.,' n.s., 



vol. iv. 



In 1891 T. S. Hall described a new species of Bictyonema 

 -B. grande from the Lancefield beds of Australia. 



In 1891 Bjorlykke gave brief descriptions and sketch- 

 figures of some species of Bidymograptus, etc., found by 

 himself in Western Gausdal. These include B. geminus, B. 

 cfr. nitidus or balticus, B. cfr. euodus, B. hirvndo or patulus, D. 

 pusillus, Biplog. teretiusculus, Glimacograptus sp., Pterograptus 

 elegans, and Tetragraptus bryoiioides. 



Matthew during this year recorded the discovery of 

 Bictyonema flabelliforme in the St. John's Group. He 

 discusses the importance of this fossil as a zone index in 

 Europe. 



He considers that Bictyonema was a free, floating 

 organism, and " began life as a Bryograptus." 

 1891. 



During the same year Pritchard recorded what he con- 

 sidered to be a new species of Temnograptus from Australian 

 deposits, under the name T. magnificus. 



1891. 



Bjorlykke, 



" Grraptolitforende 



Skifere i v. Gausdal," 



' Norges Geol. Uiiderso- 



gelse Aarbog,' no. 1. 



1891. 



Matthew, 



" On a new Horizon in 



the St. John's Group," 



' Canad. Eecord of 



Science.' 



Pritchard, 



" On a new Species of 



the Graptolitidae-Te/tt- 



nograptus magnificus," 



' Proc. Eoy. Soc. Vict.' 



1891. 



Gurley, 



" On some recent 



Graptolitic Literature," 



' Anier. Geol.,' vol. viii. 



A general review of Jaekel's, Geinitz's, Tornquist's, and 

 Holm's papers issued during the previous two years, was 

 published by Gurley in the 'American Geologist ' for 1891. 



