1896. THE STRUCTURE OF THE GRAPTOLITES. 249 



and this need not seem strange if we remember that even a recent 

 animal of well-known anatomy may within a fairly short time be 

 assigned to widely-separated classes of the animal kingdom. 



LITERATURE. 



1. Barrande, J. — " GraptolitesdeBoheme, extrait du systeme silurien du centre 



de la Boheme." Prague: 1850. Continued by J. Perner, as "Etudes 

 sur les Graptolites de Boheme." Prague: 1894. 



2. Liapmrorth, C. — "Notes on the British Graptolites and their Allies. I. — On 



an improved Classification of the Rhabdophora." Parts I. and II. Geol. 

 Mag., 1873. N.S., Dec, I., vol. x., pp. 500 and 555. 



3- ■ — "On Scottish Monograptidae." Geol. Mag., 1876. N.S., 



Dec. II., vol. iii., pp. 308, 350, 499, and 544. 



4. Zittel, K. A. — " Handbuch der Palaeontologie. Palaeozoologie." Munchen 



und Leipzig: 1879. Bd. i., Abth. i., p. 290. 



5. Tornquist, S. L. — " Studier ofver Retiolites." Geol. Fdren. i Stockholms 



Forhandl., i88r. No. 63 (Bd. v., no. 7), p. 292. 



6. Hopkinson, J. — " On some Points in the Morphology of the Rhabdophora, 



or true Graptolites." Ann. Mag. Nat. Hist., 1882. Ser. 5, vol. ix., pp. 

 54-57- 



7. Holm, G. — "Gotlands Graptoliter." Bihang. K. Svenska Vet.-Akad. HandL, 



1890. Bd. xvi., Afd. iv., no. 7. 



8. Jaekel, O. — " Ueber das Alter des sogen. Graptolithen-Gesteins mit besonderer 



Beriicksichtigung der in demselben enthaltenen Graptolithen." Zeitschr. 



deutsch. geol. Ges., 1890. Bd. xH., pp. 653-716, pis., xxviii-xxix. 

 Ciirich, G. — " Ueber die Form der Zellenmiindung von Monograptus priodon 



und iiber Silur und Devon des polnischen Mittelgebirges." Jahresber. 



Schlesisch. Ges., 1893. Ixx., pp. 12-13. 

 10. Moberg, J. Chr. — "En Monograptus forsedd med discus." Geol. Fdren. i 



Stockholms Forhandl., 1893. No. 149 (Bd. xv., Haft 2), p. 95. 

 XI. Tornquist, S. L. — "Observations on the Structure of some Diprionidse." 



Kongl. Fysiogr. Sdllsk. Handl. Lund., 1893. n.f. 1892-93, Bd. iv. 

 12. Sollas, W. J. — " On the minute Structure of the Skeleton of Monograptus 



priodon." Geol. Mag., 1893. N.S., Dec, III., vol. x., p. 551, and Rep. Brit. 



Assoc, 1893, p. 781 ; 1894. 



t3. Wiman, C— " Ueber Diplograptidse Lapw." Bull. Geol. Inst. Upsala, 1893. 

 No. 2, vol. i. 



14- .—" Ueber Monograptus Geinitz." Bull. Geol. Inst. Upsala, 1893. 



No. 2, vol. i. 



15. Tornquist, S. L<,— "Nugra anmarkningar om graptoliternas terminologi." 



Geol. Fdren. i Stockholms Forhandl., 1894, No. 158 (Bd. xvi., Haft 4), p. 375. 



16. Holm, G.— " Om Didymograptus, Tetragraptus och Phyllograptus." Op. cit., 



1895. No. 164 (Bd. xvii.. Haft 3), p. 319. Translated by G. L. Elles and 

 E. M. R. Wood, Geol. Mag., Dec, IV., vol. ii., pp. 433 and 481 ; 1895. 



17. Ruedeman, R.— " Synopsis of the Mode of Growth and Development of the 



Graptolitic Genus Diplograptus." Amer.Journ. Sci., 1895. Ser. 3, vol. xlix., 

 P453- 



18. Wiman, C— " tJber die Graptoliten." Bull. Geol. Inst. Upsala, 1895. No. 4, 



vol. ii., part 2. 

 ig. Nicholson, H. A., and Marr, J, E.— "Notes on the Phylogeny of the 

 Graptolites." Geol. Mag., 1895. N.S., Dec, IV., vol. ii., pp. 529-539. 



Upsala. Carl Wi.man. 



