xciv BRITISB GRAPTOLITES. 



A paper by Tornquist on the Graptolite shales of Dalarne 



'"'■ ■ ■ • 



rpo rnQU i 8t is mainly stratigraphical, but two new species are described 



" Nagra Iakttagelser and figured, viz. Didympgraptus minutus and Pkyllograptus 



iifver Dalames Grapto- densus, while a now variety of Diployraptus palmeus var. 



htskiffar,'"Geol.F6ren. superstes, and one of M. spiralis var. subconicus are recorded. 



In Dalarne he recognises the following graptolite horizons: 



1, Phyllograptus skiffer with Pkyllograptus, Tetragraptus, etc.; 2, Trinucleus 



skiffer, corresponding to the Hartfell; 3, Lobiferus skiffer, with five zones: («) 



M. leptotheca, {b)Biplo. comcta, (c) M. Scdgwickii, (<l) M. turriculatus, (e) M. priodon 



and P. palmeus var. superstes; and 4, Retiolites skiffer with llet. Geinitzianus and 



M. spiralis var. subconicus. 



-|oj,q joy-. In his text-book of fossils Quenstedt gives a general 



Quenstedt, account of the Graptolites, and figures of many forms, but the 



' Petref acteukunde majority of these are copies from earlier authors. He classes 



Deutschlands, bd. vi, the Graptolites among- the corals, between the "Rind" corals 



Tia P ° and the Bryozoa, and retains the old nomenclature. 



Description of Species. — (I) Dictyonema fldbelliforme he describes under the old 



name of Gorgonia. His figures of (2) Graptolithus serratus include forms of the 



group M. colonus, etc. His (3) (Jr. ludensis includes M. priodon and M. testis, his 



(4) Gr. colonus — M. Boemeri, M. dubius, Vidymo. pennatulus and I). Murchisoni, 



his (5) Gr. scalaris embraces M. Nilssoni, M. bohemicus, etc. 



The Didymograpti noticed by him include Tetragraptus, and all the allied 



branched forms, together with Dendrograptus, while Diplograptus and Climaco- 



graptus, etc., are classed as Digrapti. 



-.qq. In 1880 Lapworth described and figured a number of new 



Lavvmrth, British species of Graptolites, revised a few forms already 



" On new British recognised but of which little was known, and he suggested 



Graptolites," 'Ann. some new generic and sub-generic names. The species figured 



Mag. Nat. Hist.,' ser. 5, include the following: (1) Monograptus leintwardinensis, 



vol - v ' Hopk. MS, (2) M. Salweyi, Hopk. MS., (3) 71/. Boemeri, 



(4) M. colonus, (5) M. galaensis var. basilicus, (6) M. crenularis, (7) M. crassus, 



(8) M. riccartonensis, (9) M. Flemingii, (10) M. Eisingeri var. nudus, M. Salteri, 



(11) Cyrtograptus Linnarsso: i, (12) Azygograptus coelebs, (13) Dicellograptus 



complanatus, (14) Dicello. intortus, (15) Dicello. patulosus, (16) Dicello. divaricatus 



var. rigidus. The new genus Bryograptus is founded, and two new species 



described belonging to this genus, viz. (17) Bryo. Kjerulfi and (18) Bryo. Callavei. 



Under Diplograptus he describes Nicholson's (19) D. physophora, (20) D. 



socialis, nov. d, (21) D. (Glyptograptus) euglyphus, (22) D. perexcavatus, D. 



rugosus, Emm? (23) Olimacog. confertus. 



He proposes the new sub-generic name Idiograptus for forms typified by (24) 



D. aculeatus. 



