462 



BRITISH GBAPTOLITES. 



Horizon and Locality. — Wenlock Beds. 



8. Scotland. — Rig Burn, River Esk, miles W.N.W. of Langholm. 



Associates, etc. — Unknown. 



Collection. — Geological Survey of Scotland. 



V. (b) : Monograpti with lobed thee as in which the polypary has ventral curvature. 



Fig. 320.^Monograptus Barrandei 



(Suess). 



Monograptus Barrandei (Suess). Plate XLVI, figs. 6 a, b. 



1851. GraptolitJius Barrandei, Suess, Bohin. Grapt., p. 126, pi. ix, fig. 12. 



1876. Monograptus Barrandei, Lapworth, Geol. Mag. [2], vol. iii, p. 502, pi. xx, figs. 5 a — d. 



Polypary several cm. in length, very slender, arcuate, with an average breadth 

 of about *5 mm. Thecae on the concave margin, seven to eight in 10 mm., 

 long slender tubes with apertural extremity coiled into a conspicuous lobe 

 which occupies about three-fourths of the total breadth of the polypary. 



Description. — The polypary of Monog. Barrandei 

 is only known in a fragmentary condition and details 

 regarding the proximal end are obscure. The 

 thecae are always on the concave side so far as 

 known, and there is a marked increase in breadth 

 opposite the apertural lobes, the polypary measuring 

 fully *5 mm. at these points, whereas elsew r here the 

 dimensions do not exceed 3 mm. The ventral walls 

 of the tbecas tend to run in an almost straight line 

 broken only by the projecting lobes. 



Affinities. — Monog. Barrandei differs from the 

 other slender-lobed Monograpti mainly in the cur- 

 vature of the polypary, and the more conspicuous 

 lobes. 



Horizon and Localities. — Gala Beds (lower zones). 

 8. Scotland: Waterfall, Main Linn, Dobb's Linn; Caddonhead ; Buckholm ; 

 Meigle. Ireland : Tieveshilly, Co. Down. 



Associates, etc. — Monog. Barrandei is found with M. Bechi in the lower zones 

 of the Gala beds. 



Collections. — Geological Survey of Scotland, and Lapworth. 



Enlargement of part of counter-impres- 

 sion of PL XLVI, fig. 6 a, showing 

 the lobed apertural regions. 



Monograptus kneckensis, sp. nov. Plate XLVI, figs. 8 a, b. 



Polypary of unknown length, straight or with very slight curvature, having 

 the thecas on the convex margin, and with an average maximum breadth 



