12 



Sv. Leonh. Törnquist. 



right or slightly oblique angles; each theca is at the concave apartural margin 

 provided with two bristles, occupying not fully the half length of the entire theca. 



In a copy of his paper »Ueber die Zonenfolge der ostthüriugischen und vogt- 

 ländischen Graptolithenschiefer», presented to me, Mr Eisel has added a written 

 notice concerning Bastrites rastrum Richt., stating that he has found examples of 

 this species bearing thecse resembling those of Bastrites phleoides. I have seen no 

 such specimens, and, judging from the material in my hands, the last-named form 

 differs from the common aspect of Bastrites rastrum, not only in the presence of 

 rather long thecal bristles, but also in the fact that the rhabdosorne seems to have 

 grown out into a more elongated conical (or almost cylindrical) spire. Therefore, 

 though these two forms have so many features in common that their close rela- 

 tionship appears beyond doubt, I think it, nevertheless, most advisable, for the 

 present, to conceive Bastrites phleoides as a distinct species. Carruthers has (loc. 

 cit.) delineated some theca? in all essentials similar to those of the graptolite now 

 under consideration, which thecse, however, he explained as belonging to the inner 

 coil of some specimens of Monograptus convolutus His., collected in the Moffat 

 district. As the questions raised by these drawings will be discussed later on, 

 under the head of Monograptus convolutus, I confine myself, in this place, to re- 

 producing some similar theca? of graptolitic fragments from the same region. They 

 are evidently much deformed by cleavage. 



Localities and horizon. Thuringia; This graptolite was discovered by 

 me, several years ago, at Böhmsdorf in the zone of Cephàlograptus cometa (zone 

 13). Scotland: the fragments illustrated in figs. 9 and 10 are seen on a slab be- 

 longing to a collection sent by Professor Lapworth to the Geological Museum 

 of Lund. 



Rastrites distans Lapworth, var. abbreviatus Lapworth. 



PI. II, figs. 11-20. 



1852 Monograpsus Linneei Geinitz, pars, Die Graptolithen, p. 48, Taf. V, figs. 16, (18?). 

 186K Bastrites Linneei Carruthers, A Revision of the British Graptolites; Geol. 



Mag. Vol. V; p. 13, Pl. V, fig. 15. 

 i 876 distans Lapw. var. abbreviatus Lapworth, On Scottish Monograptidœ; 



Geol. Mag. Dec. II, Vol. Ill; p. 314. 

 1890 cfr. Monograptus Linneei Geinitz, pars, Die Graptol. d. K. Mineralog. Museums 



in Dresden, p. 22, Taf. A, figs 32 a, b. 

 1899 Bastrites Linneei var. abbreviatus Eisel, Die Schichtenfolge d. ostthüring. und 



vogtl. Graptolithenschiefer, p. 6. 



The proximal portion of the rhabdosorne shows a short backward curvature, 

 resembling that of Rastrites peregrinus, while the distal division is straight, or ac- 

 cidentally tortuous. Near the sicula the theca? are short, only about .5 mm. long, 

 and their internodes do not reach 1 mm. in length; but the theca? as well as their 



