MONOGRAPTUS. 307 



I. A. 1. (h) : Moiwr/raj'fi in which the thecse are uniform and the poljpary 



shows ventral curvature. 



Monograptus bohemicus (Barrande). Plate XX XVI, figs. 4 a — d. 



1850. GrapfdlUliVit lohemkvK, Bariaude, Graptolites de Bolieme, p. 40, pi. i, figs. 15 — 18. 



1851. GnijitdlUJnitt hoJicmicus, Suess, Uebev Bohiiiische Graptolitlu'ii, pp. 110 — 111, pi. viii, figs. 

 6 a — e. 



1851. ? Graptulitlius Barrandfi, Scharenberg, Ueber Graptolithen, etc., In.iug. Dissert. (Breslau), 

 p. 15, pi. i, figs. 5 — 5fl. 



1852. Monocjrciptus hoJiemicus, Geiuitz, Die Graptolitheu . . . der Grauwackenforination in 

 Sachseu, p. 36, pi. ii, fig. 41. 



1869. GrapfoUtlnis hohcmicHx, Hcidenhain, Zeitschr. d. doutscli. gcol. Gesellsch., toI. xxi, p. 149, 



pi. i, figs. 4 a — c. 

 1881. Graptolithus scahirh, Quenstedt, Petrefaetenlcunde Dentscbl.. \ol. vi, pi. c1, fig. 44. 

 1883. Monograptits hohemlcKs, Tiillberg, Skunos Graptolitcr, pi. iii, figs. 3 — 5. 

 1884 MonoijraplKs holieiiiicux, J. D. La Touche, Handbook to the Gecdogy of Shropsbire, p. 77, 



pi. xviii, fig. 573. 



1889. Frlstiograptus hjJiemicus, Jaekel, Zeitschr. d. deutsch. geol. Gesellsch., vol. xli, p. 672, 

 p). xxviii, figs. 3 — 6. 



1890. Monoijraptus holiemicus, Geinitz, Die Graptolitheu d. k Min. iNIus. in Dresden, p. 14, pi. a, 

 fig. 10. 



1897. Prittfiograjtttis bohemicus, Freeh, Leth. Geogn., vol. i, pt. iii, p. 644. 



1900. Monograpias hohoiiicus, Wood, Quart. Jouru. Geol. vSoe., vol. Ivi, p. 483, text-fig. 25, pi. xxv,- 

 figs. 27 A and 27 b. 



Polypar}' several cm. in length., straight distaliy, with hroad concave sweep in 



the proximal portion, widening steadily till a maximum hreadth of 2 mm. is 



attained. Thecte eleven to nine in 10 nnn., simple short tuljes Avith a 



maximum leng-th of about 2 mm., two to three times as long as wide, 



overlapping one-third to one-half their length ; average inclination 30 — 35° ; 



apertm-al margins wide. 



Description. — The broad sweep of the polypary in the proximal region is highly 



characteristic of the species, and in small individuals the whole polypary appears 



to share in the curvature, the straight distal portion being only seen in long 



specimens. 



The sicula is usually conspicuous; it has a length of about 1 nun. and its 

 great width in the apertural region gives a distinctive character to the proximal 

 end as a whole ; the virgella is usually stout. 



The theca3 are short and broad tubes quite simple in character, though in the 

 concave portion of the polypary the breadth of the apertures often induces impres- 

 sion of tlie ventral wall of the theca lying next above, giving a characteristic 

 appearance to the polyj)ary after compression. 



49 



