•118 BRITISH GRAPTOLITES. 



var. primus, var. compaetus, M. uncinatus var. orbatus, var. micropoma, 

 M. irfonensis. 

 2. With curved polypary. 



(a) The polypary has dorsi-ventral curvature. Type, Monograptus 

 flexilis. 



M. acus, M. distans, M. undulatas, M. scanicus, M. crinitus, M. 

 Jaelcell, M. gemmatus. 



(b) The polypary has spiral curvature. Type, Monograptus turriculatus. 

 M. discus, M. tortilis (?). 



B. With bi-form thecae — 



1. With approximately straight polpary. Type, Monograptus Sedgwiclrii. 



M. Halli, M. M'Goyi. 



2. With curved polypary. 



(</) The polypary has spiral curvature. Monograptus testis, var. 

 inomatus (?). 



IV. A. l : Mohograpti in which the thecce are uniform and the polypary approxi- 

 mately straight. 



Monograptus priodon (Bronn.). Plate XLII, figs. 2 a—e. 



1835. Lomatoceras priodon, Broun, Lethea Geognostica, I, p. 56, pi. i, fig. 13. 



1850. Graptolithus priodon, Barrande, Grapt. de Boheme, p. 38, pi. i, figs. 3—9, 14. 



1851. Graptolithus priodon, Suess, Bohm. Graptolithen, p. 25, pi. viii, fig. 5. 



1852. Monograptus priodon, Geiuitz, Die Graptolithen, p. 43, pi. iii, figs. 20—24, 26, 28—30. 

 1868. Oraptolites priodon, Nicholson, Grapt. Coniston Flags, Quart. Journ. Geol. Soc , vol. xxiv, p. 



540, pi. xx, fig. 6. 



1871. Monograptus priodon, Richter, Aus dem Thiiring. Schiefergeb., iv, Zeitschr. d. deutscli. geol. 

 Gesell., vol. xxiii, pi. v, fig. 1. 



1872. Graptolites priodon, Nicholson, Monogr. Brit. Grapt., p. 102, fig. 47. 



1875. Monograptus priodon, Richter, Aus dem Thiiring. Schiefergeb., v, Zeitschr. d. deutsch. geol. 

 Gesell., vol. xxvii, p. 269, pi. viii, fig. 7. 



1876. Monograptus priodon, Lapworth, Scottish Monograptidae, Geol. Mag., [2], vol. iii, p. 21. 



1877. Monograptus priodon, Lapworth, Grapt. Co. Down, Proc. Belfast Nat. Field Club, p. 129, pi. 

 v, fig. 24. 



1879. Monograptus priodon, Linnarsson, Gotl. Grapt., K. Svensk. Vet.-Akad. Forhandl., p. 24, pi. x, 



figs. 1—12. 

 1881. Motiograptus priodon, Tornquist, Om Nagra Grapt. fran Dalarne, Geol. Foren. i. Stockholm 



Forhandl, vol. v, p. 737, pi. xvii, fig. 3. 

 1881. Monograptus priodon, Linnarsson, Grapt. nied M. turriculatus vid Klubbuden, Geol. Foren. 



i Stockholm Forhandl., vol. v, p. 509, pi. xxii, figs. 3, 4. 

 1883. Monograptus priodon, Tullbei'g, Skanes Graptoliter, ii, p. 22, pi. ii, fig. 24. 

 1890. Monograptus priodon, Holm, Gotl. Grapt., Bihang till K. Svensk. Vet.-Akad. Handl., vol. xvi. 



p. 14, fig. 28. 

 1890. Monograptus priodon, Geinitz, Grapt. Dresden Museum, p, 17, pi. A, fig. 16. 

 1892. Monograptus priodon, Tornquist, Siljansomrad. Grapt., ii, p. 13, pi. 1, figs. 22 — 27. 



